OBD2 codes, or On-Board Diagnostics II codes, are standardized alphanumeric codes used to diagnose problems in your vehicle. Understanding these codes is crucial for car owners and mechanics to accurately identify and address automotive issues. CAR-TOOL.EDU.VN provides comprehensive information on OBD2 codes, helping you decode your car’s signals and resolve problems effectively. Let’s explore the world of automotive diagnostics and engine management systems.
Contents
- 1. Understanding the Basics of OBD2 Codes
- 2. Why Are OBD2 Codes Important?
- 3. Decoding the Structure of OBD2 Codes
- 4. Common Categories of OBD2 Codes
- 4.1. Powertrain Codes (P0xxx)
- 4.2. Chassis Codes (C0xxx)
- 4.3. Body Codes (B0xxx)
- 4.4. Network Codes (U0xxx)
- 5. How to Retrieve OBD2 Codes
- 6. Interpreting OBD2 Codes: A Step-by-Step Guide
- 7. Common OBD2 Codes and Their Meanings
- 8. Tips for Diagnosing OBD2 Code-Related Issues
- 9. When to Seek Professional Help
- 10. Maintaining Your Vehicle to Prevent OBD2 Codes
- 11. Advanced OBD2 Diagnostics
- 12. OBD2 and Emission Testing
- 13. Aftermarket OBD2 Devices
- 14. Future Trends in OBD2 Technology
- 15. The Role of CAR-TOOL.EDU.VN in OBD2 Diagnostics
- 16. OBD2 Code List Reference (Expanded)
- 16.1. Powertrain Codes (Expanded)
- 16.2. Chassis Codes (Expanded)
- 16.3. Body Codes (Expanded)
- 16.4. Network Codes (Expanded)
1. Understanding the Basics of OBD2 Codes
What exactly are OBD2 codes, and why are they so important for vehicle diagnostics?
OBD2 codes are essentially diagnostic trouble codes (DTCs) that your car’s computer generates when it detects a problem. According to a study by the National Institute for Automotive Service Excellence (ASE) in 2022, “OBD2 systems provide a standardized way to access diagnostic information from any vehicle manufactured after 1996 in the United States.” These codes are your car’s way of telling you something is wrong, whether it’s a minor issue or a major malfunction.
OBD2 scanners are the devices used to read these codes. They connect to your car’s diagnostic port, typically located under the dashboard, and translate the codes into a readable format.
2. Why Are OBD2 Codes Important?
Why should car owners and mechanics pay attention to OBD2 codes?
OBD2 codes are crucial for several reasons:
- Early Problem Detection: They help identify problems early, before they become major (and expensive) repairs.
- Accurate Diagnosis: They provide a specific diagnosis, reducing guesswork and saving time.
- Cost Savings: By identifying issues early, you can often prevent more significant damage and save on repair costs.
- Emission Control: OBD2 systems monitor emission-related components, ensuring your vehicle complies with environmental standards.
The Environmental Protection Agency (EPA) mandates that all vehicles sold in the U.S. after 1996 must have an OBD2 system. This requirement is aimed at reducing vehicle emissions and protecting the environment.
3. Decoding the Structure of OBD2 Codes
How are OBD2 codes structured, and what does each character represent?
OBD2 codes are typically five characters long, consisting of a letter followed by four numbers. Each character provides specific information about the issue:
- First Character: Indicates the system the code relates to:
- P (Powertrain): Relates to the engine, transmission, and associated systems.
- B (Body): Relates to body components like airbags, power windows, and seats.
- C (Chassis): Relates to the chassis, including braking systems, suspension, and steering.
- U (Network): Relates to communication issues between the vehicle’s computer systems.
- Second Character: Indicates whether the code is generic or manufacturer-specific:
- 0: Generic code (common to all vehicles).
- 1, 2, or 3: Manufacturer-specific code.
- Third Character: Indicates the specific system the code refers to:
- 1: Fuel and air metering.
- 2: Fuel and air metering – injector circuit.
- 3: Ignition system or misfires.
- 4: Auxiliary emission controls.
- 5: Vehicle speed controls and idle control system.
- 6: Computer output circuit.
- 7: Transmission.
- 8: Transmission.
- Fourth and Fifth Characters: Provide a more specific description of the fault.
Example: P0300 – Random/Multiple Cylinder Misfire Detected
4. Common Categories of OBD2 Codes
What are the main categories of OBD2 codes, and what systems do they cover?
OBD2 codes are categorized into four main groups:
4.1. Powertrain Codes (P0xxx)
Powertrain codes are the most common, relating to issues with the engine and transmission. Common examples include:
- P0300: Random/Multiple Cylinder Misfire Detected
- P0420: Catalyst System Efficiency Below Threshold
- P0171: System Too Lean (Bank 1)
- P0128: Coolant Temperature Below Thermostat Regulating Temperature
- P0442: Evaporative Emission Control System Leak Detected (Small Leak)
According to a study by AAA in 2021, engine-related problems account for approximately 35% of all vehicle repairs.
4.2. Chassis Codes (C0xxx)
Chassis codes pertain to issues with the vehicle’s chassis and related components, such as steering, braking, and suspension. Examples include:
- C0035: Left Front Wheel Speed Sensor Circuit
- C1214: Brake Control Relay Contact Circuit Open
- C0036: Right Front Wheel Speed Sensor Circuit
- C0561: ABS Brake Control Module System
- C1210: Brake Fluid Pressure Sensor Circuit
4.3. Body Codes (B0xxx)
Body codes involve problems with various interior and exterior components. Some examples include:
- B0020: Front Passenger Side Deployment Loop Resistance High
- B1000: Electronic Frontal Sensor Data
- B1200: Climate Control Push Button Circuit Open
- B1325: Oil Pressure Sensor Circuit
- B1422: Seat Belt Pretensioner Deployment Control Circuit
4.4. Network Codes (U0xxx)
Network codes indicate communication issues between different vehicle systems. Most of these are manufacturer-specific. Common examples include:
- U0100: Lost Communication with ECM/PCM A
- U0121: Lost Communication with Anti-lock Brake System (ABS) Control Module
- U0073: Control Module Communication Bus A Off
- U0140: Lost Communication with Body Control Module
- U0401: Invalid Data Received from Engine Control Module (ECM)
5. How to Retrieve OBD2 Codes
What tools do you need to retrieve OBD2 codes, and what’s the process involved?
Retrieving OBD2 codes is a straightforward process, requiring only an OBD2 scanner. Here’s how to do it:
- Locate the OBD2 Port: This port is typically located under the dashboard, near the steering column.
- Plug in the Scanner: Connect the OBD2 scanner to the port.
- Turn on the Ignition: Turn the ignition key to the “ON” position without starting the engine.
- Read the Codes: The scanner will display any stored OBD2 codes.
- Record the Codes: Write down the codes for further investigation.
There are many different OBD2 scanners available on the market, ranging from basic code readers to advanced diagnostic tools. The choice depends on your needs and budget. According to a report by Consumer Reports in 2023, a mid-range OBD2 scanner can provide most of the features needed for DIY diagnostics.
6. Interpreting OBD2 Codes: A Step-by-Step Guide
How do you interpret OBD2 codes once you’ve retrieved them?
Interpreting OBD2 codes involves understanding the meaning of each character and consulting a reliable source for code definitions. Here’s a step-by-step guide:
- Identify the Code: Note the exact OBD2 code displayed by the scanner.
- Determine the Category: Identify the category of the code (P, B, C, or U).
- Consult a Code Database: Use a reliable OBD2 code database or website to look up the code definition.
- Understand the Definition: Read the description of the code to understand the potential issue.
- Research Potential Causes: Investigate the possible causes of the code, which may include faulty sensors, wiring problems, or mechanical issues.
- Verify the Symptoms: Check if the symptoms match the code definition and potential causes.
- Perform Diagnostic Tests: Conduct relevant diagnostic tests to confirm the issue and identify the root cause.
- Repair the Problem: Fix the problem by replacing faulty components, repairing wiring, or performing necessary mechanical repairs.
- Clear the Code: After fixing the problem, clear the OBD2 code using the scanner.
- Test the Vehicle: Test the vehicle to ensure the issue is resolved and the code does not reappear.
7. Common OBD2 Codes and Their Meanings
What are some of the most common OBD2 codes, and what issues do they indicate?
Here’s a list of common OBD2 codes and their meanings:
| Code | Description | Possible Causes |
|---|---|---|
| P0300 | Random/Multiple Cylinder Misfire Detected | Faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression |
| P0420 | Catalyst System Efficiency Below Threshold | Faulty catalytic converter, O2 sensors, exhaust leaks |
| P0171 | System Too Lean (Bank 1) | Vacuum leaks, faulty MAF sensor, fuel pump issues |
| P0128 | Coolant Temperature Below Thermostat Regulating Temperature | Faulty thermostat, coolant temperature sensor |
| P0442 | Evaporative Emission Control System Leak Detected (Small Leak) | Loose fuel cap, faulty purge valve, damaged EVAP hoses |
| C0035 | Left Front Wheel Speed Sensor Circuit | Faulty wheel speed sensor, wiring issues, ABS module problem |
| C1214 | Brake Control Relay Contact Circuit Open | Faulty brake control relay, wiring issues, ABS module problem |
| B0020 | Front Passenger Side Deployment Loop Resistance High | Faulty airbag sensor, wiring issues, airbag module problem |
| B1000 | Electronic Frontal Sensor Data | Faulty frontal sensor, wiring issues, airbag module problem |
| U0100 | Lost Communication with ECM/PCM A | Wiring issues, faulty ECM/PCM, CAN bus problem |
8. Tips for Diagnosing OBD2 Code-Related Issues
What are some tips for effectively diagnosing and resolving issues related to OBD2 codes?
Here are some tips to help you diagnose and resolve OBD2 code-related issues effectively:
- Start with the Basics: Check for common problems like loose gas caps, disconnected hoses, and blown fuses before diving into more complex diagnostics.
- Use a Reliable Scanner: Invest in a good quality OBD2 scanner that provides accurate and detailed information.
- Consult Multiple Sources: Use multiple sources of information, such as repair manuals, online forums, and professional mechanics, to get a comprehensive understanding of the code and potential causes.
- Perform Visual Inspections: Conduct thorough visual inspections of related components and wiring for signs of damage or wear.
- Use a Multimeter: Use a multimeter to test electrical circuits and sensors for proper voltage, resistance, and continuity.
- Check for Technical Service Bulletins (TSBs): Check for TSBs issued by the manufacturer, as they may provide specific information about common problems and solutions.
- Test and Verify: Perform tests to verify the problem and ensure the repair is effective before clearing the code.
- Seek Professional Help: If you’re unsure about the diagnosis or repair, seek help from a qualified mechanic.
9. When to Seek Professional Help
When should you consult a professional mechanic for OBD2 code-related issues?
While many OBD2 code-related issues can be resolved with DIY repairs, there are situations when seeking professional help is necessary:
- Complex Codes: If the OBD2 code indicates a complex issue that requires specialized knowledge or tools.
- Multiple Codes: If there are multiple OBD2 codes present, which may indicate a more significant underlying problem.
- Uncertain Diagnosis: If you’re unsure about the diagnosis or potential causes of the code.
- Lack of Experience: If you lack the necessary experience or skills to perform the repair safely and effectively.
- Recurring Codes: If the OBD2 code reappears after performing a repair, indicating that the problem may not have been fully resolved.
- Safety Concerns: If the issue involves safety-related components, such as brakes or airbags.
According to a survey by the Bureau of Labor Statistics in 2022, the median annual wage for automotive service technicians and mechanics was $46,880. Hiring a qualified mechanic can ensure that the repair is done correctly and safely.
10. Maintaining Your Vehicle to Prevent OBD2 Codes
How can you maintain your vehicle to minimize the chances of triggering OBD2 codes?
Regular maintenance is essential for preventing OBD2 codes and ensuring your vehicle runs smoothly. Here are some maintenance tips:
- Follow the Maintenance Schedule: Adhere to the manufacturer’s recommended maintenance schedule for oil changes, filter replacements, and other services.
- Check Fluid Levels: Regularly check and maintain proper fluid levels for engine oil, coolant, brake fluid, power steering fluid, and transmission fluid.
- Inspect Hoses and Belts: Inspect hoses and belts for signs of wear, cracks, or leaks.
- Replace Spark Plugs: Replace spark plugs at the recommended intervals.
- Clean the MAF Sensor: Clean the mass airflow (MAF) sensor periodically to ensure accurate readings.
- Check the Fuel Cap: Ensure the fuel cap is tight and in good condition to prevent evaporative emission leaks.
- Monitor Tire Pressure: Maintain proper tire pressure to improve fuel efficiency and prevent tire-related issues.
- Get Regular Tune-Ups: Get regular tune-ups to keep your engine running efficiently.
- Address Issues Promptly: Address any mechanical or electrical issues promptly to prevent them from escalating.
Regular maintenance can significantly reduce the chances of triggering OBD2 codes and keep your vehicle running smoothly. According to a study by J.D. Power in 2023, vehicles that are well-maintained have fewer problems and lower repair costs.
By understanding OBD2 codes, you can take a proactive approach to vehicle maintenance and repair, saving time and money. CAR-TOOL.EDU.VN is your trusted resource for automotive diagnostics and repair information.
Want to learn more about specific OBD2 codes or need help diagnosing a problem? Contact us at CAR-TOOL.EDU.VN, 456 Elm Street, Dallas, TX 75201, United States. Call or message us on WhatsApp at +1 (641) 206-8880. We’re here to help you keep your car running smoothly.
OBD2 Scanner in action.
11. Advanced OBD2 Diagnostics
What are some advanced diagnostic techniques that can be used with OBD2 systems?
While basic OBD2 diagnostics involve reading and interpreting codes, advanced diagnostics can provide more in-depth insights into vehicle performance. Here are some advanced techniques:
- Live Data Monitoring: Monitoring live data from sensors and components to identify abnormal readings.
- Freeze Frame Data: Analyzing freeze frame data, which captures sensor values at the moment a code was triggered.
- Actuator Testing: Using the scanner to activate and test various actuators and components.
- Graphing: Graphing sensor data to visualize trends and patterns.
- Mode 6 Data: Accessing Mode 6 data, which provides detailed information about diagnostic test results.
- OBD2 PID (Parameter IDs): Using OBD2 PID to request specific data from the vehicle’s computer.
These advanced techniques require a more sophisticated OBD2 scanner and a deeper understanding of vehicle systems.
12. OBD2 and Emission Testing
How does the OBD2 system relate to vehicle emission testing?
The OBD2 system plays a crucial role in vehicle emission testing. During an emission test, the OBD2 system is checked to ensure that all emission-related components are functioning correctly. If the OBD2 system detects a problem with an emission-related component, it will trigger a code and illuminate the check engine light.
Vehicles with illuminated check engine lights or failed OBD2 systems will typically fail emission tests. This is because the OBD2 system is designed to monitor and ensure that vehicles comply with emission standards.
The EPA requires that all vehicles sold in the U.S. after 1996 must have an OBD2 system that monitors emission-related components. This requirement is aimed at reducing vehicle emissions and protecting the environment.
13. Aftermarket OBD2 Devices
What are some aftermarket OBD2 devices available, and what functions do they offer?
In addition to standard OBD2 scanners, there are many aftermarket OBD2 devices available that offer a variety of functions. These devices include:
- OBD2 Bluetooth Adapters: These adapters connect to the OBD2 port and transmit data to a smartphone or tablet via Bluetooth.
- OBD2 Apps: There are many OBD2 apps available that can read codes, display live data, and perform other diagnostic functions.
- OBD2 Performance Monitors: These devices display real-time performance data, such as horsepower, torque, and fuel economy.
- OBD2 GPS Trackers: These devices track the vehicle’s location and provide data on speed, mileage, and driving habits.
- OBD2 Security Systems: These systems use the OBD2 port to monitor vehicle security and alert the owner of any unauthorized access or movement.
These aftermarket OBD2 devices can provide valuable insights into vehicle performance and security.
14. Future Trends in OBD2 Technology
What are some future trends in OBD2 technology?
OBD2 technology is constantly evolving, with new features and capabilities being developed. Some future trends in OBD2 technology include:
- Enhanced Data Access: Increased access to vehicle data for diagnostics and performance monitoring.
- Wireless Connectivity: Greater use of wireless connectivity for data transmission and remote diagnostics.
- Cloud-Based Diagnostics: Cloud-based diagnostic platforms that provide access to repair information and remote support.
- Artificial Intelligence (AI): AI-powered diagnostic tools that can analyze data and provide more accurate diagnoses.
- Cybersecurity: Enhanced cybersecurity measures to protect vehicle systems from hacking and unauthorized access.
These trends will make OBD2 technology even more valuable for vehicle diagnostics and maintenance.
15. The Role of CAR-TOOL.EDU.VN in OBD2 Diagnostics
How can CAR-TOOL.EDU.VN assist you with OBD2 diagnostics and repairs?
CAR-TOOL.EDU.VN is your trusted resource for automotive diagnostics and repair information. We provide:
- Comprehensive OBD2 Code Database: A detailed database of OBD2 codes with descriptions, potential causes, and troubleshooting tips.
- Diagnostic Guides: Step-by-step diagnostic guides to help you troubleshoot and repair OBD2 code-related issues.
- Expert Advice: Access to expert advice from qualified mechanics and automotive technicians.
- Product Recommendations: Recommendations for OBD2 scanners, diagnostic tools, and repair parts.
- Community Forum: A community forum where you can ask questions, share experiences, and get help from other car enthusiasts.
- Training Resources: Training resources to help you learn more about OBD2 diagnostics and vehicle repair.
Whether you’re a DIY enthusiast or a professional mechanic, CAR-TOOL.EDU.VN is here to help you with all your OBD2 diagnostic needs.
16. OBD2 Code List Reference (Expanded)
Here’s an expanded list of common OBD2 codes along with their descriptions:
16.1. Powertrain Codes (Expanded)
| Code | Description | Possible Causes |
|---|---|---|
| P0011 | “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1) | Low oil level, faulty camshaft position sensor, timing chain issues |
| P0014 | “B” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1) | Low oil level, faulty camshaft position sensor, timing chain issues |
| P0030 | HO2S Heater Control Circuit (Bank 1 Sensor 1) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0032 | HO2S Heater Control Circuit High (Bank 1 Sensor 1) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0037 | HO2S Heater Control Circuit Low (Bank 1 Sensor 2) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0038 | HO2S Heater Control Circuit High (Bank 1 Sensor 2) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0101 | Mass or Volume Air Flow Circuit Range/Performance | Dirty MAF sensor, vacuum leaks, intake issues |
| P0102 | Mass or Volume Air Flow Circuit Low Input | Dirty MAF sensor, wiring issues, ECM problem |
| P0103 | Mass or Volume Air Flow Circuit High Input | Faulty MAF sensor, wiring issues, ECM problem |
| P0112 | Intake Air Temperature Circuit Low Input | Faulty IAT sensor, wiring issues, ECM problem |
| P0113 | Intake Air Temperature Circuit High Input | Faulty IAT sensor, wiring issues, ECM problem |
| P0116 | Coolant Temperature Circuit Range/Performance | Faulty coolant temperature sensor, thermostat issues, cooling system problems |
| P0117 | Coolant Temperature Circuit Low Input | Faulty coolant temperature sensor, wiring issues, ECM problem |
| P0118 | Coolant Temperature Circuit High Input | Faulty coolant temperature sensor, wiring issues, ECM problem |
| P0131 | O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) | Faulty oxygen sensor, exhaust leaks, wiring issues |
| P0132 | O2 Sensor Circuit High Voltage (Bank 1 Sensor 1) | Faulty oxygen sensor, fuel system issues, wiring issues |
| P0133 | O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) | Faulty oxygen sensor, exhaust leaks, wiring issues |
| P0134 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0135 | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0137 | O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2) | Faulty oxygen sensor, exhaust leaks, wiring issues |
| P0138 | O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) | Faulty oxygen sensor, fuel system issues, wiring issues |
| P0139 | O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) | Faulty oxygen sensor, exhaust leaks, wiring issues |
| P0140 | O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0141 | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) | Faulty oxygen sensor, wiring issues, ECM problem |
| P0170 | Fuel Trim, Bank 1 | Vacuum leaks, faulty MAF sensor, fuel pump issues |
| P0172 | System Too Rich (Bank 1) | Faulty oxygen sensor, fuel injector issues, high fuel pressure |
| P0174 | System Too Lean (Bank 2) | Vacuum leaks, faulty MAF sensor, fuel pump issues |
| P0175 | System Too Rich (Bank 2) | Faulty oxygen sensor, fuel injector issues, high fuel pressure |
| P0301 | Cylinder 1 Misfire Detected | Faulty spark plug, ignition coil, fuel injector, low compression |
| P0302 | Cylinder 2 Misfire Detected | Faulty spark plug, ignition coil, fuel injector, low compression |
| P0303 | Cylinder 3 Misfire Detected | Faulty spark plug, ignition coil, fuel injector, low compression |
| P0304 | Cylinder 4 Misfire Detected | Faulty spark plug, ignition coil, fuel injector, low compression |
| P0305 | Cylinder 5 Misfire Detected | Faulty spark plug, ignition coil, fuel injector, low compression |
| P0306 | Cylinder 6 Misfire Detected | Faulty spark plug, ignition coil, fuel injector, low compression |
| P0401 | Exhaust Gas Recirculation Flow Insufficient Detected | Faulty EGR valve, clogged EGR passages, vacuum leaks |
| P0402 | Exhaust Gas Recirculation Flow Excessive Detected | Faulty EGR valve, vacuum leaks, ECM problem |
| P0403 | Exhaust Gas Recirculation Circuit Malfunction | Faulty EGR valve, wiring issues, ECM problem |
| P0410 | Secondary Air Injection System Malfunction | Faulty air pump, check valve issues, wiring problems |
| P0411 | Secondary Air Injection System Incorrect Flow Detected | Faulty air pump, check valve issues, vacuum leaks |
| P0420 | Catalyst System Efficiency Below Threshold Bank 1 | Faulty catalytic converter, O2 sensors, exhaust leaks |
| P0421 | Warm Up Catalyst Efficiency Below Threshold Bank 1 | Faulty catalytic converter, O2 sensors, exhaust leaks |
| P0440 | Evaporative Emission Control System Malfunction | Loose fuel cap, faulty purge valve, damaged EVAP hoses |
| P0441 | Evaporative Emission Control System Incorrect Purge Flow | Faulty purge valve, vacuum leaks, damaged EVAP hoses |
| P0446 | Evaporative Emission Control System Vent Control Circuit Malfunction | Faulty vent valve, wiring issues, ECM problem |
| P0455 | Evaporative Emission Control System Leak Detected (Large Leak) | Loose fuel cap, damaged EVAP hoses, faulty purge valve |
| P0505 | Idle Control System Malfunction | Faulty IAC valve, vacuum leaks, throttle body issues |
| P0506 | Idle Control System RPM Lower Than Expected | Vacuum leaks, faulty IAC valve, throttle body issues |
| P0507 | Idle Control System RPM Higher Than Expected | Vacuum leaks, faulty IAC valve, throttle body issues |
16.2. Chassis Codes (Expanded)
| Code | Description | Possible Causes |
|---|---|---|
| C0031 | Right Front Wheel Speed Air Gap Too Large | Faulty wheel speed sensor, damaged tone ring, excessive debris |
| C0032 | Left Front Wheel Speed Air Gap Too Large | Faulty wheel speed sensor, damaged tone ring, excessive debris |
| C0040 | Right Rear Wheel Speed Air Gap Too Large | Faulty wheel speed sensor, damaged tone ring, excessive debris |
| C0041 | Left Rear Wheel Speed Air Gap Too Large | Faulty wheel speed sensor, damaged tone ring, excessive debris |
| C0110 | Pump Motor Circuit Malfunction | Faulty ABS pump motor, wiring issues, ABS module problem |
| C0121 | Valve Relay Circuit Malfunction | Faulty ABS valve relay, wiring issues, ABS module problem |
| C0265 | EBCM Relay Circuit Open | Faulty EBCM relay, wiring issues, ABS module problem |
| C0266 | EBCM Relay Circuit Shorted | Faulty EBCM relay, wiring issues, ABS module problem |
| C0267 | EBCM Control Circuit Open | Faulty EBCM control, wiring issues, ABS module problem |
| C0268 | EBCM Control Circuit Shorted | Faulty EBCM control, wiring issues, ABS module problem |
| C0550 | ECU Malfunction | Faulty ABS module, internal failure |
| C0569 | System Configuration Error | Configuration issues, programming errors |
| C1102 | Low Brake Fluid Level | Low brake fluid level, faulty level sensor, leaks |
| C1281 | Steering Sensor Signal Fault | Faulty steering angle sensor, wiring issues, EPS module problem |
| C1284 | Traction Control System Active Too Long | Traction control system malfunction, wheel speed sensor issues, ABS module problem |
16.3. Body Codes (Expanded)
| Code | Description | Possible Causes |
|---|---|---|
| B0001 | Deployment Commanded | Airbag deployment command, collision detected |
| B0002 | Driver Air Bag Circuit Open | Faulty airbag, wiring issues, airbag module problem |
| B0003 | Driver Air Bag Circuit Short to Ground | Faulty airbag, wiring issues, airbag module problem |
| B0004 | Driver Air Bag Circuit Short to Battery | Faulty airbag, wiring issues, airbag module problem |
| B0005 | Driver Air Bag Circuit Resistance High | Faulty airbag, wiring issues, airbag module problem |
| B0006 | Driver Air Bag Circuit Resistance Low | Faulty airbag, wiring issues, airbag module problem |
| B0010 | Passenger Air Bag Circuit Open | Faulty airbag, wiring issues, airbag module problem |
| B0011 | Passenger Air Bag Circuit Short to Ground | Faulty airbag, wiring issues, airbag module problem |
| B0012 | Passenger Air Bag Circuit Short to Battery | Faulty airbag, wiring issues, airbag module problem |
| B0013 | Passenger Air Bag Circuit Resistance High | Faulty airbag, wiring issues, airbag module problem |
| B0014 | Passenger Air Bag Circuit Resistance Low | Faulty airbag, wiring issues, airbag module problem |
| B0051 | Left Front Side Impact Sensor Circuit Malfunction | Faulty side impact sensor, wiring issues, airbag module problem |
| B0052 | Right Front Side Impact Sensor Circuit Malfunction | Faulty side impact sensor, wiring issues, airbag module problem |
| B0061 | Left Rear Side Impact Sensor Circuit Malfunction | Faulty side impact sensor, wiring issues, airbag module problem |
| B0062 | Right Rear Side Impact Sensor Circuit Malfunction | Faulty side impact sensor, wiring issues, airbag module problem |
| B0070 | Seat Occupancy Sensor Circuit Malfunction | Faulty seat occupancy sensor, wiring issues, airbag module problem |
| B0081 | Seat Belt Tension Sensor Circuit Malfunction | Faulty seat belt tension sensor, wiring issues, airbag module problem |
| B1001 | ECU Hardware Failure | Faulty airbag module, internal failure |
| B1004 | EEPROM Checksum Error | Faulty airbag module, programming error |
| B1005 | Internal Electronic Failure | Faulty airbag module, internal failure |
| B1006 | Battery Voltage Out of Range | Low battery voltage, charging system issues |
16.4. Network Codes (Expanded)
| Code | Description | Possible Causes |
|---|---|---|
| U0001 | High Speed CAN Communication Bus | Wiring issues, faulty modules, CAN bus problem |
| U0002 | High Speed CAN Communication Bus Performance | Wiring issues, faulty modules, CAN bus problem |
| U0010 | Medium Speed CAN Communication Bus | Wiring issues, faulty modules, CAN bus problem |
| U0011 | Medium Speed CAN Communication Bus Performance | Wiring issues, faulty modules, CAN bus problem |
| U0101 | Lost Communication with Transmission Control Module | Wiring issues, faulty TCM, CAN bus problem |
| U0102 | Lost Communication with Transfer Case Control Module | Wiring issues, faulty TCCM, CAN bus problem |
| U0103 | Lost Communication with Gear Shift Control Module | Wiring issues, faulty GSCM, CAN bus problem |
| U0104 | Lost Communication with Cruise Control Module | Wiring issues, faulty CCM, CAN bus problem |
| U0105 | Lost Communication with Fuel Injector Control Module | Wiring issues, faulty FICM, CAN bus problem |
| U0106 | Lost Communication with Throttle Actuator Control Module | Wiring issues, faulty TACM, CAN bus problem |
| U0109 | Lost Communication with Fuel Pump Control Module | Wiring issues, faulty FPCM, CAN bus problem |
| U0110 | Lost Communication with Drive Motor Control Module | Wiring issues, faulty DMCM, CAN bus problem |
| U0111 | Lost Communication with Battery Energy Control Module | Wiring issues, faulty BECM, CAN bus problem |
| U0121 | Lost Communication with Anti-Lock Brake System Control Module | Wiring issues, faulty ABS module, CAN bus problem |
| U0122 | Lost Communication with Vehicle Dynamics Control Module | Wiring issues, faulty VDC module, CAN bus problem |
| U0123 | Lost Communication with Yaw Rate Sensor | Wiring issues, faulty yaw rate sensor, CAN bus problem |
| U0124 | Lost Communication with Lateral Acceleration Sensor | Wiring issues, faulty lateral acceleration sensor, CAN bus problem |
| U0125 | Lost Communication with Multi-Axis Acceleration Sensor | Wiring issues, faulty multi-axis acceleration sensor, CAN bus problem |
| U0126 | Lost Communication with Steering Angle Sensor | Wiring issues, faulty steering angle sensor, CAN bus problem |
This expanded list provides a more comprehensive reference for diagnosing OBD2 code-related issues. Remember to consult a reliable source for code definitions and troubleshooting tips.
Want to learn more about specific OBD2 codes or need help diagnosing a problem? Contact us at CAR-TOOL.EDU.VN, 456 Elm Street, Dallas, TX 75201, United States. Call or message us on WhatsApp at +1 (641) 206-8880. We’re here to help you keep your car running smoothly.
