P0371 High Resolution Signal A Phase Control - Too Many Pulses

P0371 – OBD-II Trouble Code Technical Description

Trouble code P0371 is a general trouble code that indicates that the Engine Control Module (ECM) has detected a problem with the vehicle's timing system high resolution "A" reference signal.

What does the fault code mean P0371?

Trouble code P0371 indicates that the vehicle's electronic control module has detected a change in the high-resolution engine timing signal, specifically too many pulses. This can be caused by a variety of problems, such as a defective crankshaft position sensor, wiring problems, or electrical problems.

Possible reasons

Trouble code P0371 can be caused by a variety of reasons, including:

• Defective crankshaft position (CKP) sensor: If the CKP sensor is not functioning properly or has completely failed, it may cause a P0371 code.
• Problems with wiring or electrical connections: Opens, short circuits or other problems with the wiring or electrical connections between the CKP sensor and the ECU may cause the error.
• Malfunctions in the ignition system: Malfunctions in the ignition system, such as a defective ignition coil, spark plugs, or wires, can cause the CKP sensor to malfunction and cause trouble code P0371.
• Problems with the crankshaft gear or teeth: If the crankshaft gear or teeth are damaged or dirty, it may cause the CKP sensor to read the signal incorrectly and cause an error.
• Problems with the ECU (electronic control unit): Incorrect operation or damage to the ECU itself can also cause P0371.

To accurately determine the cause of the error, it is recommended to conduct a detailed diagnosis of the vehicle using appropriate equipment and, if necessary, replace or repair the relevant components.

What are the symptoms of a fault code? P0371?

Symptoms for DTC P0371 may vary depending on the specific cause of the code and vehicle characteristics. Some of the common symptoms that may occur with this error are:

• Difficulty starting the engine: A defective crankshaft position sensor can cause difficulty starting the engine or even complete failure to start the engine.
• Rough engine operation: Incorrect crankshaft position reading can result in rough engine running, unstable idle speed, or even loss of power.
• Ignition misfires: If the crankshaft position sensor is not working properly, it can cause a misfire, which can manifest itself in a rattling or jerking engine.
• Increased fuel consumption: Incorrect operation of the CKP sensor may result in incorrect ignition timing, which may result in increased fuel consumption.
• Increased emissions: Uneven engine operation may result in increased emissions.

If any of the above symptoms occur, it is recommended that you contact an auto repair specialist to diagnose and repair the problem.

How to diagnose a fault code P0371?

The following procedure is recommended to diagnose DTC P0371:

1. Checking the error code: Use the OBD-II diagnostic scanner to read the error code from the vehicle's ECU. This will allow you to determine exactly what is causing the problem.
2. Visual inspection of CKP sensor and wiring: Inspect the crankshaft position sensor and its electrical connections for visible damage, corrosion, or broken wiring.
3. Checking wiring and connections: Check the wiring, connections and connectors between the CKP sensor and the ECU for corrosion, breaks or broken contacts.
4. Checking the resistance of the CKP sensor: Use a multimeter to measure the resistance of the CKP sensor. The resistance must be within the specifications given in the repair manual.
5. Checking the CKP sensor signal: Using an oscilloscope or multimeter with graphing function, check the signal generated by the CKP sensor when the crankshaft rotates. The signal must be stable and have the correct shape.
6. Checking the crankshaft gear or teeth: Check the condition of the crankshaft gear or teeth for damage, wear or contamination.
7. Additional tests: In some cases, additional tests may be required, such as checking the voltage and signal on the CKP sensor wires, and checking the electrical parameters in the ignition system.

After diagnosing and determining the cause of the P0371 error, you can begin to repair or replace the relevant components. If you are unable to diagnose it yourself, it is recommended that you contact a qualified auto mechanic or service center.

Diagnostic errors

When diagnosing DTC P0371, the following errors may occur:

1. Misinterpretation of symptomsNote: Because the symptoms associated with the P0371 code can be varied and ambiguous, the problem may be misinterpreted. This may lead to incorrect diagnosis and replacement of unnecessary components.
2. Incorrect diagnosis of CKP sensor: If the crankshaft position sensor is diagnosed as faulty, but the problem is actually in the wiring, connectors, or other system components, the sensor may not be replaced correctly.
3. Skipping check of crankshaft gear or teeth: If you do not check the condition of the crankshaft gear or teeth, problems with these components may be missed, causing the error to reoccur after replacing the CKP sensor.
4. Problems with wiring or electrical connections: Sometimes the problem may be due to an open, short circuit or improper contact in the wiring or connectors. Unsuccessful diagnosis can lead to incorrect determination of the cause and, as a result, to incorrect repair.
5. Insufficient diagnostics of the ignition system: Trouble code P0371 may not only be related to the CKP sensor, but also to other ignition system components such as the ignition coils, spark plugs, or wires. Failure to properly diagnose these components may result in incomplete resolution of the problem.

To successfully diagnose the P0371 code, you must thoroughly test for all possible causes using the appropriate equipment and methods. If you are unsure of your abilities or experience, it is recommended that you contact a professional auto mechanic or service center.

How serious is the fault code? P0371?

Trouble code P0371, found in the engine management system, is a serious problem that can cause the engine to malfunction and reduce engine performance. That's why:

• Incorrect engine operation: When the P0371 code occurs, the engine may run rough, which can lead to poor performance, rough idling, and even difficulty starting the engine.
• Loss of power and increased fuel consumption: Improper functioning of the ignition and spark timing control system may result in loss of engine power and increased fuel consumption.
• Possible damage to the catalytic converter: Uneven engine running can result in increased emissions, which in turn can adversely affect the condition of the catalytic converter and lead to its damage.
• Potential engine hazard: Incorrect operation of the ignition and spark timing systems can cause serious engine problems such as overheating or damage to internal components.
• Negative impact on the environment: Improper engine operation can lead to increased emissions of harmful substances into the atmosphere, which has a negative impact on the environment and human health.

Based on the above, DTC P0371 requires immediate attention and correction of the problem to prevent serious consequences for the engine and the environment.

What repair will help eliminate the code? P0371?

Troubleshooting DTC P0371 may include the following:

1. Replacing the Crankshaft Position (CKP) Sensor: If the CKP sensor is faulty or its operation is unreliable, it should be replaced with a new one. It is important to install an original or high-quality similar spare part.
2. Checking and replacing the crankshaft gear or teeth: If the crankshaft gear or teeth are damaged or worn, they must also be replaced.
3. Checking and repairing wiring and electrical connections: The wiring, connectors and electrical connections between the CKP sensor and the ECU must be carefully inspected for corrosion, breaks or other damage. If necessary, they must be replaced or repaired.
4. Diagnostics and repair of the ignition system: If necessary, other ignition system components such as ignition coils, spark plugs and wires should be diagnosed and repaired. Defective components must be replaced.
5. Checking and updating ECU software: Sometimes updating the ECU software can help resolve P0371 if the problem is due to an incompatibility or bug in the software.

After repairs are completed, the system must be tested to ensure that the P0371 code no longer appears and that the engine is operating correctly. If you do not have the necessary skills or experience to perform the repair yourself, it is recommended that you contact a qualified auto mechanic or service center.

P0371 – Brand-specific information

Trouble code P0371 is generally a generic code that can be found on different makes of vehicles. It indicates problems with the engine timing signal or crankshaft position sensor.

Below are some car brands with their definitions for error code P0371:

1. BMW – Too many motor synchronization pulses.
2. Ford – Incorrect engine timing signal.
3. Toyota – Insufficient engine synchronization signal.
4. Chevrolet – Problem with high resolution engine timing signal.
5. Honda – Too many motor synchronization pulses.
6. Volkswagen (VW) – Incorrect engine synchronization signal.

These are just a few examples. Therefore, it is recommended to consult the owner's manual or service center of your specific vehicle brand for more detailed information about fault codes and their meanings for your vehicle.