P0373 Intermittent/unsteady pulses during high resolution "A" signal phase control control

P0373 – OBD-II Trouble Code Technical Description

Trouble code P0373 indicates that the PCM has detected a problem with the vehicle's timing system high-resolution reference “A” signal.

What does the fault code mean P0373?

Trouble code P0373 indicates a problem with the high resolution reference “A” signal in the vehicle's timing system. This means that the engine control module or automatic transmission control module has detected a deviation or instability in the engine timing signal, which is normally used to properly synchronize the engine and transmission.

Possible reasons

Some possible reasons that could cause the P0373 code:

• 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 or giving an incorrect signal, it can cause P0373.
• 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 P0373.
• Crankshaft sensor disc: Damage or wear to the crankshaft sensor disc may cause the signal to not be read correctly, causing P0373.
• Problems with the engine control module (ECM) or transmission control module (PCM): Malfunctions in the ECM or PCM, which are responsible for processing signals from the CKP sensor and synchronizing the operation of the engine and automatic transmission, can also cause the P0373 code.
• 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 P0373.
• Problems with the crankshaft gear or teeth: If the crankshaft gear or teeth are damaged or worn, it may affect the signal from the CKP sensor and cause P0373.

To accurately determine the cause of error P0373, it is recommended to conduct a detailed diagnosis of the vehicle using diagnostic equipment or contact a professional auto mechanic.

What are the symptoms of a fault code? P0373?

Symptoms for DTC P0373 may include the following:

• Problems with starting the engine: Difficulty starting the engine or completely refusing to start may be one of the first signs of a problem with the crankshaft position (CKP) signal.
• Rough engine operation: Observing rough engine operation, such as rattling, jerking, or rough idling, may also indicate problems with the CKP signal.
• Loss of power: If the CKP signal is incorrect, the engine may lose power, resulting in poor overall vehicle performance.
• Increased fuel consumption: Incorrect operation of the CKP signal may cause inefficient fuel combustion, which may result in increased fuel consumption.
• Check Engine Light: The check engine light turning on on your car's dashboard is one of the most common symptoms of the P0373 code. This indicator warns the driver of possible problems with engine operation.

These symptoms may occur to varying degrees and depending on the specific problem. If you experience these symptoms, it is recommended that you immediately contact a professional auto mechanic to diagnose and repair the problem.

How to diagnose a fault code P0373?

The following steps are recommended to diagnose DTC P0373:

1. Checking the error code: Use the OBD-II diagnostic scanner to read the P0373 error code from the ECU (engine control module) memory. 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 P0373 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 P0373, the following errors may occur:

• Misinterpretation of symptomsNote: Because the symptoms associated with the P0373 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 P0373 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 P0373 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? P0373?

Trouble code P0373 is a serious problem that can have a negative impact on engine performance and vehicle performance. A few reasons why this code should be taken seriously:

1. Potential engine starting problems: Trouble code P0373 can lead to difficulty starting the engine or complete failure to start. This can leave you unable to use your vehicle and can be especially problematic in emergency situations.
2. Rough engine operation: Improper engine timing can cause the engine to run rough, resulting in rough idling, rattling, jerking and other problems that can impair ride quality and comfort.
3. Loss of power: Improper engine timing can result in loss of power, which in turn will affect the performance of the vehicle. This can lead to poor acceleration and overall vehicle dynamics.
4. Increased fuel consumption and emissions: Improper engine timing can result in inefficient fuel combustion, resulting in increased fuel consumption and increased emissions.
5. Potential damage to other components: Rough engine operation and improper timing can have a negative impact on other vehicle systems and components, such as the fuel injection system, ignition system and catalytic converter.

Considering the above factors, the P0373 trouble code requires immediate attention and troubleshooting to maintain reliable and safe vehicle operation.

What repair will help eliminate the code? P0373?

To resolve DTC P0373, the following steps are recommended:

1. Replacing the Crankshaft Position (CKP) Sensor: If the CKP sensor fails or gives an incorrect signal, 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 P0373 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.
6. Checking and servicing the ignition and fuel injection system: Incorrect operation of the ignition or fuel injection system can also lead to P0373. Check the condition of the ignition coils, spark plugs, injectors and other system components and carry out the necessary repairs.

After repairs are completed, the system should be tested to ensure that the P0373 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 P0373 Engine Code - OBD II Trouble Code Explain

P0373 – Brand-specific information

Trouble code P0373 is a universal trouble code that can be found on various makes of vehicles. It indicates a problem with the high resolution reference “A” signal in the engine timing system. Here are some decodings for different car brands:

• BMW – Problem with the crankshaft position (CKP) sensor signal.
• Ford – Deviation in the engine synchronization signal.
• Toyota – Incorrect signal from the crankshaft position sensor.
• Chevrolet – Problem with engine timing.
• Honda – Insufficient crankshaft reference sensor signal.
• Volkswagen (VW) – Problem with high resolution reference signal.

These are just some examples. The interpretation of error codes may vary slightly depending on the specific model and year of manufacture of the car. 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.