The Volvo Check Engine Light indicates a potential issue within your vehicle’s engine or related systems, signaling the need for prompt investigation to prevent minor problems from escalating into major repairs. Addressing these concerns effectively can save you time and money. CAR-TOOL.EDU.VN provides expert insights, diagnostic tools, and repair solutions. Let’s explore common causes, diagnostic steps, and how to take appropriate action when this warning appears, ensuring your Volvo remains reliable and efficient with engine diagnostics and automotive repair guidance.
Contents
1. Understanding the Volvo Check Engine Light: A Comprehensive Guide
The Volvo check engine light, like that in any modern vehicle, is a critical component of the onboard diagnostics (OBD) system, designed to alert drivers to potential issues affecting engine performance, emissions, or other vital systems. When this light illuminates, it signifies that the car’s computer has detected an anomaly. This can range from minor issues, such as a loose gas cap, to more significant problems like a faulty catalytic converter. Understanding the nuances of this warning system is crucial for maintaining the health and longevity of your Volvo.
The check engine light can present in several states, each indicating a different level of urgency. A steady light typically suggests a problem that needs attention but isn’t immediately critical. However, a flashing light usually indicates a more severe issue, such as an engine misfire, which can quickly lead to further damage if ignored. It is essential to distinguish between these states to determine the appropriate course of action. Ignoring a flashing check engine light can result in costly repairs, including damage to the catalytic converter, oxygen sensors, or other essential components.
Key aspects of the Volvo check engine light include:
- Function: To alert the driver of potential issues affecting engine performance or emissions.
- Severity: Can range from minor inconveniences to major problems requiring immediate attention.
- States: Steady light (needs attention), flashing light (severe issue requiring immediate action).
By understanding these basics, Volvo owners can respond effectively to check engine light warnings, ensuring their vehicles remain in optimal condition and preventing minor issues from becoming major headaches.
Alt text: A detailed view of a Volvo engine bay highlighting key components such as the air intake, fuel injectors, and spark plugs, illustrating the complex system monitored by the check engine light.
2. Common Causes of the Volvo Check Engine Light
Several factors can trigger the Volvo check engine light, ranging from simple fixes to complex mechanical issues. Identifying the root cause is the first step in resolving the problem and preventing potential damage to your vehicle. Here are some of the most common reasons why the check engine light might illuminate in your Volvo:
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Loose or Damaged Gas Cap: The gas cap seals the fuel system, maintaining pressure and preventing fuel vapors from escaping. A loose or damaged gas cap can cause a pressure drop, triggering the check engine light. According to the National Highway Traffic Safety Administration (NHTSA), this is one of the most common reasons for the light to come on.
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Oxygen Sensor Issues: Oxygen sensors monitor the amount of oxygen in the exhaust gases, providing feedback to the engine control unit (ECU) to optimize the air-fuel mixture. Faulty oxygen sensors can lead to poor fuel economy, increased emissions, and engine performance issues. A study by the Environmental Protection Agency (EPA) found that malfunctioning oxygen sensors can reduce fuel efficiency by as much as 40%.
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Catalytic Converter Problems: The catalytic converter reduces harmful emissions by converting pollutants into less harmful substances. A failing catalytic converter can significantly increase emissions and affect engine performance. According to research from the University of California, Berkeley, catalytic converter failures are often caused by issues with upstream components, such as faulty oxygen sensors or engine misfires.
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Mass Airflow (MAF) Sensor Issues: The MAF sensor measures the amount of air entering the engine, which the ECU uses to calculate the correct amount of fuel to inject. A dirty or faulty MAF sensor can cause poor engine performance, reduced fuel economy, and rough idling.
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Spark Plug or Ignition Coil Problems: Spark plugs ignite the air-fuel mixture in the engine cylinders, while ignition coils provide the necessary voltage to the spark plugs. Worn or damaged spark plugs or ignition coils can cause engine misfires, reduced power, and poor fuel economy.
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Vacuum Leaks: Vacuum leaks can disrupt the air-fuel mixture, leading to various engine performance issues, including rough idling, stalling, and poor acceleration. Vacuum leaks can occur in hoses, gaskets, or intake manifolds.
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EGR Valve Issues: The Exhaust Gas Recirculation (EGR) valve helps reduce emissions by recirculating a portion of the exhaust gas back into the engine. A malfunctioning EGR valve can cause rough idling, poor performance, and increased emissions.
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Fuel Injector Problems: Fuel injectors spray fuel into the engine cylinders. Dirty or faulty fuel injectors can cause poor engine performance, reduced fuel economy, and misfires.
Understanding these common causes can help you diagnose the issue more effectively and take appropriate action to resolve the problem. Remember, addressing these issues promptly can prevent further damage and ensure your Volvo continues to operate efficiently.
3. Diagnosing the Volvo Check Engine Light: Step-by-Step Guide
When the check engine light illuminates in your Volvo, it’s essential to diagnose the issue accurately. While a professional mechanic can provide the most precise diagnosis, there are several steps you can take to identify the problem and potentially resolve it yourself. Here is a step-by-step guide to diagnosing the Volvo check engine light:
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Check the Gas Cap:
- Ensure that the gas cap is tightly secured. A loose gas cap is a common cause of the check engine light.
- Remove the gas cap and inspect it for damage. Replace it if necessary.
- After tightening or replacing the gas cap, drive your Volvo for a few trips to see if the light turns off.
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Use an OBD-II Scanner:
- Purchase or borrow an OBD-II scanner. These devices plug into your car’s OBD-II port, typically located under the dashboard.
- Turn on your Volvo’s ignition but do not start the engine.
- Plug the OBD-II scanner into the port and follow the scanner’s instructions to read the diagnostic trouble codes (DTCs).
- Record the codes and research their meaning. Websites like OBD-Codes.com or the CAR-TOOL.EDU.VN database can provide detailed information.
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Inspect Common Problem Areas:
- Oxygen Sensors: Check the oxygen sensors for damage or corrosion. Ensure the wiring is intact.
- Mass Airflow (MAF) Sensor: Inspect the MAF sensor for dirt or debris. Clean it with a MAF sensor cleaner if necessary.
- Spark Plugs and Ignition Coils: Examine the spark plugs for wear or damage. Check the ignition coils for cracks or other signs of failure.
- Vacuum Hoses: Inspect all vacuum hoses for cracks, leaks, or disconnections.
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Monitor Your Car’s Performance:
- Pay attention to any changes in your car’s performance, such as reduced power, rough idling, unusual noises, or decreased fuel efficiency.
- Note any specific conditions under which the check engine light comes on, such as during acceleration or after starting the engine.
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Consult a Repair Manual or Online Resources:
- Refer to your Volvo’s repair manual for specific troubleshooting steps related to the DTCs you retrieved.
- Use online resources, such as CAR-TOOL.EDU.VN, to find detailed guides, videos, and forum discussions about your Volvo’s check engine light issues.
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Reset the Check Engine Light (Optional):
- After addressing the identified issue, you can use the OBD-II scanner to reset the check engine light.
- Note that resetting the light does not fix the problem; it only clears the code. If the underlying issue persists, the light will come back on.
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Seek Professional Help:
- If you are unable to diagnose the issue or if the check engine light returns after resetting, it is best to consult a professional mechanic.
- Provide the mechanic with the DTCs you retrieved and any other relevant information about your car’s performance.
By following these steps, you can effectively diagnose the Volvo check engine light and take appropriate action to resolve the issue, saving time and money while ensuring your vehicle remains in optimal condition.
Alt text: An OBD-II scanner connected to a Volvo’s diagnostic port, displaying diagnostic trouble codes on the screen, used for identifying the cause of the check engine light.
4. Deciphering Volvo Diagnostic Trouble Codes (DTCs)
Diagnostic Trouble Codes (DTCs) are alphanumeric codes generated by your Volvo’s onboard diagnostic (OBD) system when it detects a problem. These codes provide valuable information about the nature and location of the issue, helping you diagnose the check engine light accurately. Understanding how to read and interpret DTCs is essential for effective troubleshooting. Here’s a guide to deciphering Volvo DTCs:
- Understanding the Code Structure:
- DTCs consist of one letter followed by four numbers. The letter indicates the system affected:
- P: Powertrain (engine, transmission, fuel system)
- B: Body (airbags, anti-theft system, power windows)
- C: Chassis (ABS, traction control)
- U: Network (communication issues)
- The first number indicates whether the code is generic (0) or manufacturer-specific (1).
- The remaining three numbers specify the exact fault.
- DTCs consist of one letter followed by four numbers. The letter indicates the system affected:
- Common Volvo DTC Examples:
| Code | Description | Possible Causes |
|---|---|---|
| P0171 | System Too Lean (Bank 1) | Vacuum leak, faulty oxygen sensor, dirty MAF sensor, fuel injector issues |
| P0300 | Random/Multiple Cylinder Misfire Detected | Worn spark plugs, faulty ignition coils, vacuum leak, low fuel pressure |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) | Faulty catalytic converter, faulty oxygen sensor, exhaust leak |
| P0442 | Evaporative Emission Control System Leak Detected (Small Leak) | Loose or damaged gas cap, faulty EVAP system components |
| P0455 | Evaporative Emission Control System Leak Detected (Gross Leak) | Loose or damaged gas cap, faulty EVAP system components |
| P0102 | Mass or Volume Air Flow Circuit Low Input | Dirty or faulty MAF sensor, wiring issues |
| P0113 | Intake Air Temperature Circuit High Input | Faulty intake air temperature sensor, wiring issues |
| P0301 | Cylinder 1 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0011 | “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1) | Faulty camshaft position sensor, oil flow restriction, timing chain issues |
| P0014 | “B” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1) | Faulty camshaft position sensor, oil flow restriction, timing chain issues |
| P0131 | O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) | Faulty oxygen sensor, wiring issues, exhaust leak |
| P0137 | O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) | Faulty oxygen sensor, wiring issues, exhaust leak |
| P0174 | System Too Lean (Bank 2) | Vacuum leak, faulty oxygen sensor, dirty MAF sensor, fuel injector issues |
| P2177 | System Too Lean Off Idle Bank 1 | Vacuum leak, faulty oxygen sensor, dirty MAF sensor, fuel injector issues |
| B0001-07 | Driver Frontal Stage 1 Deployment Control – Circuit Mechanical Failure | Faulty airbag module, wiring issues |
| B0010-13 | Driver Side Airbag Deployment Control – Circuit Open | Faulty airbag module, wiring issues |
| C0031-64 | Right Front Wheel Speed Sensor – Signal Plausibility Failure | Faulty wheel speed sensor, wiring issues, ABS module problem |
| C0034-64 | Rear Right Wheel Speed Sensor – Signal Plausibility Failure | Faulty wheel speed sensor, wiring issues, ABS module problem |
| U0100-00 | Lost Communication With ECM/PCM “A” | Faulty ECM/PCM, wiring issues, CAN bus problems |
| U0101-00 | Lost Communication With TCM | Faulty TCM, wiring issues, CAN bus problems |
| U0155-00 | Lost Communication With Instrument Panel Cluster (IPC) Control Module | Faulty IPC, wiring issues, CAN bus problems |
| U0401-68 | Invalid Data Received From ECM/PCM | Faulty ECM/PCM, wiring issues, CAN bus problems |
| U0415-68 | Invalid Data Received From ABS Control Module | Faulty ABS module, wiring issues, CAN bus problems |
| P0507 | Idle Air Control System RPM Higher Than Expected | Vacuum leak, faulty idle air control valve, throttle body issues |
| P2187 | System Too Lean at Idle Bank 1 | Vacuum leak, faulty oxygen sensor, dirty MAF sensor, fuel injector issues |
| P2191 | System Too Lean at Higher Load Bank 1 | Vacuum leak, faulty oxygen sensor, dirty MAF sensor, fuel injector issues |
| P0101 | Mass or Volume Air Flow Circuit Range/Performance Problem | Dirty or faulty MAF sensor, vacuum leak |
| P0103 | Mass or Volume Air Flow Circuit High Input | Faulty MAF sensor, wiring issues |
| P0112 | Intake Air Temperature Circuit Low Input | Faulty intake air temperature sensor, wiring issues |
| P0117 | Engine Coolant Temperature Circuit Low Input | Faulty engine coolant temperature sensor, wiring issues |
| P0118 | Engine Coolant Temperature Circuit High Input | Faulty engine coolant temperature sensor, wiring issues |
| P0122 | Throttle/Pedal Position Sensor/Switch A Circuit Low Input | Faulty throttle position sensor, wiring issues |
| P0123 | Throttle/Pedal Position Sensor/Switch A Circuit High Input | Faulty throttle position sensor, wiring issues |
| P0128 | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) | Faulty thermostat, low coolant level |
| P0130 | O2 Sensor Circuit (Bank 1, Sensor 1) | Faulty oxygen sensor, wiring issues, exhaust leak |
| P0132 | O2 Sensor Circuit High Voltage (Bank 1, Sensor 1) | Faulty oxygen sensor, wiring issues |
| P0136 | O2 Sensor Circuit (Bank 1, Sensor 2) | Faulty oxygen sensor, wiring issues, exhaust leak |
| P0138 | O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) | Faulty oxygen sensor, wiring issues |
| P0141 | O2 Sensor Heater Circuit (Bank 1, Sensor 2) | Faulty oxygen sensor, wiring issues |
| P0150 | O2 Sensor Circuit (Bank 2, Sensor 1) | Faulty oxygen sensor, wiring issues, exhaust leak |
| P0152 | O2 Sensor Circuit High Voltage (Bank 2, Sensor 1) | Faulty oxygen sensor, wiring issues |
| P0156 | O2 Sensor Circuit (Bank 2, Sensor 2) | Faulty oxygen sensor, wiring issues, exhaust leak |
| P0158 | O2 Sensor Circuit High Voltage (Bank 2, Sensor 2) | Faulty oxygen sensor, wiring issues |
| P0161 | O2 Sensor Heater Circuit (Bank 2, Sensor 2) | Faulty oxygen sensor, wiring issues |
| P0170 | Fuel Trim Bank 1 | Vacuum leak, faulty oxygen sensor, dirty MAF sensor, fuel injector issues |
| P0172 | System Too Rich (Bank 1) | Faulty oxygen sensor, high fuel pressure, leaking fuel injector |
| P0175 | System Too Rich (Bank 2) | Faulty oxygen sensor, high fuel pressure, leaking fuel injector |
| P0201 | Injector Circuit – Cylinder 1 | Faulty fuel injector, wiring issues |
| P0202 | Injector Circuit – Cylinder 2 | Faulty fuel injector, wiring issues |
| P0203 | Injector Circuit – Cylinder 3 | Faulty fuel injector, wiring issues |
| P0204 | Injector Circuit – Cylinder 4 | Faulty fuel injector, wiring issues |
| P0205 | Injector Circuit – Cylinder 5 | Faulty fuel injector, wiring issues |
| P0206 | Injector Circuit – Cylinder 6 | Faulty fuel injector, wiring issues |
| P0207 | Injector Circuit – Cylinder 7 | Faulty fuel injector, wiring issues |
| P0208 | Injector Circuit – Cylinder 8 | Faulty fuel injector, wiring issues |
| P0209 | Injector Circuit – Cylinder 9 | Faulty fuel injector, wiring issues |
| P0210 | Injector Circuit – Cylinder 10 | Faulty fuel injector, wiring issues |
| P0211 | Injector Circuit – Cylinder 11 | Faulty fuel injector, wiring issues |
| P0212 | Injector Circuit – Cylinder 12 | Faulty fuel injector, wiring issues |
| P0221 | Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance | Faulty throttle position sensor, wiring issues |
| P0222 | Throttle/Pedal Position Sensor/Switch B Circuit Low Input | Faulty throttle position sensor, wiring issues |
| P0223 | Throttle/Pedal Position Sensor/Switch B Circuit High Input | Faulty throttle position sensor, wiring issues |
| P0234 | Turbocharger Overboost Condition | Faulty turbocharger, boost leak, faulty boost pressure sensor |
| P0235 | Turbocharger Boost Sensor A Circuit | Faulty boost pressure sensor, wiring issues |
| P0236 | Turbocharger Boost Sensor A Circuit Range/Performance | Faulty boost pressure sensor, boost leak |
| P0237 | Turbocharger Boost Sensor A Circuit Low | Faulty boost pressure sensor, wiring issues |
| P0238 | Turbocharger Boost Sensor A Circuit High | Faulty boost pressure sensor, wiring issues |
| P0261 | Cylinder 1 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0262 | Cylinder 1 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0264 | Cylinder 2 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0265 | Cylinder 2 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0267 | Cylinder 3 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0268 | Cylinder 3 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0269 | Cylinder 3 Contribution/Balance Fault | Faulty fuel injector, low compression |
| P0270 | Cylinder 4 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0271 | Cylinder 4 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0272 | Cylinder 4 Contribution/Balance Fault | Faulty fuel injector, low compression |
| P0273 | Cylinder 5 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0274 | Cylinder 5 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0275 | Cylinder 5 Contribution/Balance Fault | Faulty fuel injector, low compression |
| P0276 | Cylinder 6 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0277 | Cylinder 6 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0278 | Cylinder 6 Contribution/Balance Fault | Faulty fuel injector, low compression |
| P0279 | Cylinder 7 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0280 | Cylinder 7 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0281 | Cylinder 7 Contribution/Balance Fault | Faulty fuel injector, low compression |
| P0282 | Cylinder 8 Injector Circuit Low | Faulty fuel injector, wiring issues |
| P0283 | Cylinder 8 Injector Circuit High | Faulty fuel injector, wiring issues |
| P0284 | Cylinder 8 Contribution/Balance Fault | Faulty fuel injector, low compression |
| P0299 | Turbocharger/Supercharger Underboost Condition | Boost leak, faulty turbocharger, faulty boost pressure sensor |
| P0302 | Cylinder 2 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0303 | Cylinder 3 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0304 | Cylinder 4 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0305 | Cylinder 5 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0306 | Cylinder 6 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0307 | Cylinder 7 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0308 | Cylinder 8 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0309 | Cylinder 9 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0310 | Cylinder 10 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0311 | Cylinder 11 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0312 | Cylinder 12 Misfire Detected | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0313 | Misfire Detected With Low Fuel | Low fuel level, fuel pump issues, fuel filter issues |
| P0314 | Single Cylinder Misfire (Cylinder not Specified) | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0315 | Crankshaft Position System Variation Not Learned | Crankshaft position sensor issue, ECM issue |
| P0316 | Misfire Detected on First 1000 Revolutions | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0320 | Ignition/Distributor Engine Speed Input Circuit | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0321 | Ignition/Distributor Engine Speed Input Circuit Range/Performance | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0322 | Ignition/Distributor Engine Speed Input Circuit No Signal | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0324 | Knock Control System Error | Faulty knock sensor, wiring issues, ECM issue |
| P0325 | Knock Sensor 1 Circuit (Bank 1 or Single Sensor) | Faulty knock sensor, wiring issues |
| P0326 | Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor) | Faulty knock sensor, wiring issues |
| P0327 | Knock Sensor 1 Circuit Low (Bank 1 or Single Sensor) | Faulty knock sensor, wiring issues |
| P0328 | Knock Sensor 1 Circuit High (Bank 1 or Single Sensor) | Faulty knock sensor, wiring issues |
| P0330 | Knock Sensor 2 Circuit (Bank 2) | Faulty knock sensor, wiring issues |
| P0331 | Knock Sensor 2 Circuit Range/Performance (Bank 2) | Faulty knock sensor, wiring issues |
| P0332 | Knock Sensor 2 Circuit Low (Bank 2) | Faulty knock sensor, wiring issues |
| P0333 | Knock Sensor 2 Circuit High (Bank 2) | Faulty knock sensor, wiring issues |
| P0335 | Crankshaft Position Sensor A Circuit | Faulty crankshaft position sensor, wiring issues |
| P0336 | Crankshaft Position Sensor A Circuit Range/Performance | Faulty crankshaft position sensor, wiring issues |
| P0337 | Crankshaft Position Sensor A Circuit Low | Faulty crankshaft position sensor, wiring issues |
| P0338 | Crankshaft Position Sensor A Circuit High | Faulty crankshaft position sensor, wiring issues |
| P0339 | Crankshaft Position Sensor A Circuit Intermittent | Faulty crankshaft position sensor, wiring issues |
| P0340 | Camshaft Position Sensor “A” Circuit (Bank 1 or Single Sensor) | Faulty camshaft position sensor, wiring issues |
| P0341 | Camshaft Position Sensor “A” Circuit Range/Performance (Bank 1 or Single Sensor) | Faulty camshaft position sensor, wiring issues |
| P0342 | Camshaft Position Sensor “A” Circuit Low (Bank 1 or Single Sensor) | Faulty camshaft position sensor, wiring issues |
| P0343 | Camshaft Position Sensor “A” Circuit High (Bank 1 or Single Sensor) | Faulty camshaft position sensor, wiring issues |
| P0344 | Camshaft Position Sensor “A” Circuit Intermittent (Bank 1 or Single Sensor) | Faulty camshaft position sensor, wiring issues |
| P0345 | Camshaft Position Sensor “A” Circuit (Bank 2) | Faulty camshaft position sensor, wiring issues |
| P0346 | Camshaft Position Sensor “A” Circuit Range/Performance (Bank 2) | Faulty camshaft position sensor, wiring issues |
| P0347 | Camshaft Position Sensor “A” Circuit Low (Bank 2) | Faulty camshaft position sensor, wiring issues |
| P0348 | Camshaft Position Sensor “A” Circuit High (Bank 2) | Faulty camshaft position sensor, wiring issues |
| P0349 | Camshaft Position Sensor “A” Circuit Intermittent (Bank 2) | Faulty camshaft position sensor, wiring issues |
| P0350 | Ignition Coil A Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0351 | Ignition Coil A Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0352 | Ignition Coil B Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0353 | Ignition Coil C Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0354 | Ignition Coil D Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0355 | Ignition Coil E Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0356 | Ignition Coil F Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0357 | Ignition Coil G Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0358 | Ignition Coil H Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0359 | Ignition Coil I Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0360 | Ignition Coil J Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0361 | Ignition Coil K Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0362 | Ignition Coil L Primary/Secondary Circuit | Faulty ignition coil, wiring issues |
| P0363 | Misfire Detected – Fueling Disabled | Worn spark plug, faulty ignition coil, fuel injector issue, low compression |
| P0365 | Camshaft Position Sensor “B” Circuit (Bank 1) | Faulty camshaft position sensor, wiring issues |
| P0366 | Camshaft Position Sensor “B” Circuit Range/Performance (Bank 1) | Faulty camshaft position sensor, wiring issues |
| P0367 | Camshaft Position Sensor “B” Circuit Low (Bank 1) | Faulty camshaft position sensor, wiring issues |
| P0368 | Camshaft Position Sensor “B” Circuit High (Bank 1) | Faulty camshaft position sensor, wiring issues |
| P0369 | Camshaft Position Sensor “B” Circuit Intermittent (Bank 1) | Faulty camshaft position sensor, wiring issues |
| P0370 | Timing Reference High Resolution Signal “A” | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0371 | Timing Reference High Resolution Signal “A” Too Many Pulses | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0372 | Timing Reference High Resolution Signal “A” Too Few Pulses | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0373 | Timing Reference High Resolution Signal “A” Intermittent/Erratic Pulses | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0374 | Timing Reference High Resolution Signal “A” No Pulses | Faulty crankshaft position sensor, faulty camshaft position sensor, wiring issues |
| P0380 | Glow Plug/Heater Circuit “A” | Faulty glow plugs, wiring issues, glow plug control module issue |
| P0381 | Glow Plug/Heater Indicator Circuit | Faulty glow plugs, wiring issues, glow plug control module issue |
| P0382 | Glow Plug/Heater Circuit “B” | Faulty glow plugs, wiring issues, glow plug control module issue |
| P0385 | Crankshaft Position Sensor “B” Circuit | Faulty crankshaft position sensor, wiring issues |
| P0386 | Crankshaft Position Sensor “B” Circuit Range/Performance | Faulty crankshaft position sensor, wiring issues |
| P0387 | Crankshaft Position Sensor “B” Circuit Low | Faulty crankshaft position sensor, wiring issues |
| P0388 | Crankshaft Position Sensor “B” Circuit High | Faulty crankshaft position sensor, wiring issues |
| P0389 | Crankshaft Position Sensor “B” Circuit Intermittent | Faulty crankshaft position sensor, wiring issues |
| P0400 | Exhaust Gas Recirculation Flow | Faulty EGR valve, vacuum leaks, carbon buildup |
| P0401 | Exhaust Gas Recirculation Flow Insufficient Detected | Faulty EGR valve, vacuum leaks, carbon buildup |
| P0402 | Exhaust Gas Recirculation Flow Excessive Detected | Faulty EGR valve, vacuum leaks, carbon buildup |
| P0403 | Exhaust Gas Recirculation Circuit | Faulty EGR valve, wiring issues |
| P0404 | Exhaust Gas Recirculation Circuit Range/Performance | Faulty EGR valve, vacuum leaks, carbon buildup |
| P0405 | Exhaust Gas Recirculation Sensor A Circuit Low | Faulty EGR sensor, wiring issues |
| P0406 | Exhaust Gas Recirculation Sensor A Circuit High | Faulty EGR sensor, wiring |
