P0372 High resolution signal phase timing control “A” – too few pulses

P0372 – OBD-II Trouble Code Technical Description

Trouble code P0372 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 P0372?

Trouble code P0372 indicates that the engine control module (ECM) or transmission control module (PCM) has detected a problem with the vehicle's high-resolution "A" reference signal in the vehicle's timing system. This signal is typically used to synchronize the fuel injection system and monitors the number of pulses detected on the sensor disk mounted on the fuel pump. In simple terms, trouble code P0372 indicates that the number of sensor signal pulses is not the expected number.

Possible reasons

Trouble code P0372 can be caused by various reasons:

• Faulty crankshaft position (CKP) sensor: The CKP sensor is responsible for transmitting the crankshaft position signal to the engine management system. If the sensor is faulty, it may result in a P0372 code.
• Problems with wiring and connections: Opens, shorts, or other problems with the wiring, connections, or connectors between the CKP sensor and the Engine Control Module can cause this error.
• Crankshaft sensor disc: Damage or wear to the crankshaft sensor disc may cause the signal to not be read correctly, causing P0372.
• Problems with the engine control module (ECM) or transmission control module (PCM): Malfunctions in the ECM or PCM responsible for processing signals from the CKP sensor and timing the fuel injection system can also cause this error.
• Problems with the ignition system or fuel injection system: Malfunctions in other components of the ignition or fuel injection system, such as ignition coils, spark plugs, or injectors, can cause the CKP sensor to malfunction and cause trouble code P0372.

To accurately determine the cause of the P0372 code, it is recommended to conduct a detailed diagnosis using appropriate diagnostic equipment or contact a professional auto mechanic.

What are the symptoms of a fault code? P0372?

Symptoms for DTC P0372 may include the following:

• Difficulty starting the engine: One of the most common symptoms is difficulty starting the engine or even the engine completely refusing to start.
• Rough engine operation: The engine may run rough, including rattling, jerking, or rough idling.
• Loss of power: The vehicle may lose power when accelerating or driving at high speeds.
• Increased fuel consumption: The fault that causes P0372 can result in increased fuel consumption due to improper operation of the injection system.
• Errors and indicators on the instrument panel: P0372 is often accompanied by the Check Engine Light on the instrument panel, as well as other error codes related to the engine management system.

These symptoms may occur to varying degrees and depending on the specific problem. It is important to pay attention to any changes in the operation of the car and take timely measures to eliminate the malfunction.

How to diagnose a fault code P0372?

The following procedure is recommended to diagnose DTC P0372:

1. Checking the error code: Use the OBD-II diagnostic scanner to read the P0372 error code from the vehicle's ECU. This will allow you to pinpoint what is causing the problem.
2. Visual inspection of the crankshaft position (CKP) sensor: Inspect the CKP sensor and its electrical connection 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: Using a multimeter, check the resistance of the CKP sensor. The resistance must meet the manufacturer's specifications.
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 or wear.
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 P0372 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 P0372, the following errors may occur:

• Misinterpretation of symptomsNote: Because the symptoms associated with the P0372 code can be varied and ambiguous, the problem may be misinterpreted. This may lead to incorrect diagnosis and replacement of unnecessary components.
• 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.
• 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.
• 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.
• Insufficient diagnostics of the ignition system: Trouble code P0372 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 P0372 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? P0372?

Trouble code P0372 is a serious problem that can have significant negative effects on engine performance and efficiency:

• Potential engine stall: Trouble code P0372 indicates a problem with the engine timing system support signal. If this problem is not corrected, it can cause the engine to stop completely, which can cause serious problems and can be dangerous on the road.
• Rough engine operation: Improper timing of the fuel injection system can cause the engine to run rough, including rough idling, rattling and jerking. This may impair performance and driving comfort.
• Loss of power and increased fuel consumption: Improper timing of the fuel injection system can result in loss of engine power and increased fuel consumption due to inefficient fuel combustion.
• Possible damage to the catalytic converter: Improper engine operation can result in increased emissions, which can damage the catalytic converter and reduce the vehicle's environmental performance.
• Possible consequences for other vehicle systems: Improper engine timing can affect the operation of other vehicle systems such as the ignition system, fuel injection system and overall engine management system.

Based on the above, DTC P0372 requires immediate attention and correction of the problem to prevent serious consequences for the engine and road safety.

What repair will help eliminate the code? P0372?

To resolve DTC P0372, the following steps are recommended:

1. Replacing the Crankshaft Position (CKP) Sensor: If the CKP sensor is faulty or its signal is not stable, it should be replaced with a new one. It is important to choose original or high-quality analogues to ensure reliable operation of the system.
2. Checking and updating ECU software (firmware): Sometimes P0372 code problems can be due to errors in the ECU software. In this case, you need to check for firmware updates and install them if possible.
3. Checking and replacing the crankshaft gear or teeth: Damage or wear to the crankshaft gear or teeth may result in incorrect signal reading. In this case, it is necessary to replace the damaged components.
4. Checking and repairing wiring and electrical connections: Wiring, connectors and electrical connections between the CKP sensor and the ECU should be checked for corrosion, breaks or other damage. If necessary, they should be replaced or repaired.
5. Checking and updating PCM software (firmware): If your vehicle is equipped with a PCM, you should also check its software and update it if necessary.

After repairs are completed, the system should be tested to ensure that the P0372 code no longer occurs 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.

How to Diagnose and Fix P0372 Engine Code - OBD II Trouble Code Explain

P0372 – Brand-specific information

Trouble code P0372 is a universal trouble code that can be found on various makes of vehicles. This code indicates a problem with the high resolution reference “A” signal in the engine timing system. Below are some car brands with explanations for trouble code P0372:

• BMW – Problem with high resolution reference signal.
• Ford – Problem with crankshaft timing.
• Toyota – Incorrect crankshaft reference sensor signal.
• Chevrolet – The engine synchronization signal does not correspond to the set parameters.
• Honda – Insufficient crankshaft reference sensor signal.
• Volkswagen (VW) – Problem with engine timing.

These are just a few examples. It is recommended that you consult your vehicle's specific owner's manual or service center for more detailed information about fault codes and their meanings for your vehicle.