Description of DTC P0337
OBD2 Error Codes

P0337 Crankshaft Position Sensor “A” Circuit Low

26.05.2022 /

P0337 – OBD-II Trouble Code Technical Description

Trouble code P0337 indicates that the PCM has detected that the crankshaft position sensor A circuit voltage is too low.

What does the fault code mean P0337?

Trouble code P0337 indicates a problem with the crankshaft position (CKP) sensor. This error indicates that the ECM (engine control module) has detected that the voltage in the crankshaft position sensor “A” circuit is too low. The crankshaft sensor plays an important role in monitoring engine performance by providing information about engine speed and cylinder position. Trouble code P0337 can cause the engine to run rough, lose power, and have other engine performance problems.

Possible reasons

Some possible causes of the P0337 trouble code:

  • Defect or damage to the crankshaft position (CKP) sensor: The sensor itself may be faulty due to wear, damage or corrosion.
  • Problems with the electrical circuit of the CKP sensor: Wires, connectors or connections may be damaged, broken or have poor contact.
  • Incorrect installation or deviation of the CKP sensor from its normal position: Incorrect installation of the CKP sensor or its deviation from the recommended position may result in P0337.
  • Problems with the engine control module (ECM): Faults in the ECM itself, which processes signals from the CKP sensor, can also cause this error.
  • Problems with the crankshaft mechanism: Damage or misalignment of the crankshaft itself may affect the performance of the CKP sensor.
  • Problems with the power system: Insufficient voltage in the vehicle's power system can also cause the P0337 code.

These causes should be considered as possible and additional vehicle diagnostics may be required to pinpoint the problem.

What are the symptoms of a fault code? P0337?

Symptoms for trouble code P0337 can vary depending on specific conditions and vehicle type, some of the possible symptoms are:

  • Check Engine Error Appears: One of the most common signs of a crankshaft position sensor problem is the Check Engine light on your dashboard coming on.
  • Uneven engine operation: At low speeds, the engine may run erratically or unevenly due to incorrect information from the CKP sensor.
  • Loss of power: Engine malfunction caused by P0337 may result in loss of power or unusual response when pressing the gas pedal.
  • Difficulty starting the engine: Some vehicles may have difficulty starting the engine due to a malfunctioning CKP sensor.
  • Unusual sounds: Unusual engine sounds such as knocking or vibration may occur, which may be due to an incorrect signal from the crankshaft position sensor.

These symptoms can appear individually or in combination with each other. If you notice any of these signs, it is recommended that you contact a qualified auto mechanic for diagnosis and repair.

How to diagnose a fault code P0337?

To diagnose DTC P0337, follow these steps:

  1. Error checking: Using a diagnostic tool, read the P0337 code and any other codes that may be stored in the ECM. This will help determine the area where the problem is occurring.
  2. Visual inspection of the CKP sensor and its wiring: Check the condition of the crankshaft position sensor and its wires for damage, wear or corrosion. Make sure the sensor is securely attached and its connectors are securely connected.
  3. Using a Multimeter to Test Voltage: Check the voltage on the CKP sensor wires while the engine is running. Normal voltage should be within the values ​​specified by the manufacturer.
  4. Checking the CKP sensor circuit: Check the CKP sensor electrical circuit for opens, shorts or incorrect connections. If necessary, repair or replace damaged wires or connectors.
  5. Checking the crankshaft and its drive mechanism: Check the condition of the crankshaft itself and its drive mechanism for damage or misalignment.
  6. Additional tests: Depending on the results of the above steps, additional tests may be required, such as checking the operation of other sensors and engine systems.
  7. Clearing errors and rechecking: Once the problem has been resolved or corrected, reset the error code using the diagnostic scan tool and retest to be sure.

If you are unable to independently determine and resolve the cause of the P0337 code, it is recommended that you contact a qualified auto mechanic or service center for further diagnosis and repair.

Diagnostic errors

When diagnosing DTC P0337, the following errors may occur:

  • Misinterpretation of data: Some auto mechanics may misinterpret the data received from the crankshaft position (CKP) sensor, which can lead to misdiagnosis and replacement of unnecessary components.
  • Insufficient testing of electrical components: Some errors may occur due to insufficient inspection of the wiring, connectors and other electrical components in the CKP sensor circuit. Incorrect connections or damage may be missed, leading to incorrect conclusions.
  • Faulty CKP sensor replacementsNote: If a problem is found with the CKP sensor, replacing it without sufficient diagnostics may not solve the problem if the root of the problem lies elsewhere.
  • Unaccounted for additional problems: Sometimes the symptoms caused by the P0337 code may be related to other problems in the fuel injection or ignition system that are not considered in the diagnosis.
  • Faulty diagnostic procedure: Failure to perform diagnostic procedures correctly or skip certain steps may lead to missed problems or incorrect conclusions.

To successfully diagnose and repair the P0337 code, it is important to have an experienced and qualified auto mechanic who will carefully follow diagnostic procedures and consider all possible factors that may affect the performance of the CKP sensor and its associated components.

How serious is the fault code? P0337?

Trouble code P0337 should be considered serious because it indicates a problem with the crankshaft position (CKP) sensor, which plays an important role in controlling engine performance. Although the vehicle may continue to operate, the presence of this error can lead to a number of problems, including:

  • Uneven engine operation: A damaged or faulty CKP sensor can cause the engine to run rough, resulting in loss of power, shaking, or other unusual behavior.
  • Loss of engine control: The ECM (Engine Control Module) uses information from the CKP sensor to determine ignition timing and fuel injection timing. A malfunctioning CKP sensor can cause these processes to malfunction, which can ultimately lead to loss of engine control.
  • Increased emissions of harmful substances: Engine malfunction caused by the P0337 code can lead to increased emissions of harmful substances, which can negatively affect the environment and technical inspection.
  • Risk of engine damage: If the engine is not running properly due to problems with the CKP sensor, there may be a risk of engine damage due to incorrect ignition timing or fuel injection.

All of the above factors make the P0337 trouble code serious and should be treated as an urgent problem that requires immediate attention and diagnosis to prevent possible consequences.

What repair will help eliminate the code? P0337?

Troubleshooting trouble code P0337 includes a number of possible actions, depending on the specific cause of the problem, several typical repair methods:

  1. Replacing the Crankshaft Position (CKP) Sensor: If the CKP sensor is faulty or fails, it must be replaced. This is one of the most common cases of the problem, especially if the sensor is old or worn out.
  2. Checking and replacing wiring and connectors: Check the wiring and connectors connecting the CKP sensor to the ECM. Damaged or broken wires, as well as oxidized or burnt connectors should be replaced.
  3. Checking and cleaning the crankshaft: Sometimes the problem may be due to contamination or damage to the crankshaft itself. In this case, it should be cleaned or, if necessary, replaced.
  4. Checking and adjusting the gap between the CKP sensor and the crankshaft: Incorrect clearance between the CKP sensor and the crankshaft can cause P0337. Make sure the clearance is within the recommended range and adjust if necessary.
  5. Checking and updating ECM software: In some cases, the problem may be related to the ECM software. Updating or reprogramming the ECM may help resolve the problem.

These steps may help resolve the P0337 trouble code, however, it is important to remember that the exact repair method will depend on the specific circumstances and type of vehicle. If you are unsure of your skills or cannot determine the cause of the problem, it is best to contact a qualified auto mechanic for diagnosis and repair.

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P0337 – Brand-specific information

Trouble code P0337 indicates a problem with the crankshaft position (CKP) sensor, decoding for some specific brands of cars:

These are just some examples of decodings for various car brands. It is important to note that information may vary slightly depending on the model and year of manufacture of the vehicle. If DTC P0337 occurs, it is recommended that you refer to your specific manufacturer's documentation or perform additional diagnostic procedures to pinpoint the problem.

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