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P0337 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


P0337 is a Diagnostic Trouble Code (DTC) within the On-Board Diagnostics II (OBD-II) system used in modern vehicles. The issue with the Crankshaft Position Sensor A Circuit Low Input has been specifically addressed in this code.


According to the P0337 code, the low voltage signal from the crankshaft position sensor A is detected by the engine control module ECM. The crankshaft position sensor shall be in charge of checking the location and speed of the engine’s crank, which is essential for ignition timing and fuel injection. A low voltage signal indicates a problem with the sensor or circuit, which could lead to engine failure.


The P0337 error code may appear for several reasons, including:

  • Faulty Crankshaft Position Sensor: A crankshaft position sensor that is broken or not working properly may provide a low-voltage signal.
  • Wiring Issues: Damaged or corroded wiring in the crankshaft position sensor circuit can result in poor electrical connections.
  • Loose or Corroded Connectors: Loose or corroded electrical connectors in the sensor circuit can disrupt the signal.
  • Engine Mechanical Problems: Engine issues, such as a damaged or misaligned crankshaft, can affect the sensor’s readings.
  • Faulty ECM: A faulty engine control module can occasionally result in false P0337 codes.


The following symptoms may be present when a P0337 code is present:

  • Illumination of the dashboard’s Check Engine Light (CEL).
  • Engine misfires or jerky operation
  • Difficulties starting the engine or stalling
  • Decreased engine power and performance.


To diagnose and confirm a P0337 code, a mechanic or technician will typically perform the following steps:

  • Use an OBD-II scanner to retrieve the trouble codes and freeze frame data.
  • Inspect the crankshaft position sensor and its wiring for physical damage or corrosion.
  • Check for loose or disconnected electrical connectors in the sensor circuit.
  • Test the crankshaft position sensor’s resistance and voltage output.
  • Inspect the engine for mechanical issues that could affect the sensor’s readings.
  • If necessary, test the ECM for faults using specialized diagnostic equipment.

Common mistakes

  • When handling a P0337 code, common errors include:
  • Crankshaft position sensor replacement without first examining the wiring or connectors.
  • ignoring several potential reasons for poor engine performance, such as difficulties with the fuel or ignition system.
  • unable to restart the car after repairs and clear the error code.

How serious is this?

The P0337 code is a serious problem that should not be overlooked. The problem can lead to engine failure, stalling, or decreased performance which may affect the safety and stability of the vehicle. Furthermore, failure to comply with this code could result in further engine damage and complications that should be resolved as soon as possible.

What repairs can fix the codeS?

repair manuals

Repairs to address a P0337 code may include:

  • Replacing the Crankshaft Position Sensor: If the sensor is found to be faulty, it should be replaced with a new one.
  • Repairing or Replacing Wiring: If damaged or corroded wiring is identified, it should be repaired or replaced.
  • Addressing Engine Mechanical Issues: If engine mechanical problems are affecting the sensor’s readings, they should be resolved.
  • Testing and Potentially Replacing the ECM: If all other possibilities are ruled out, testing and potentially replacing the engine control module may be necessary.

Related codes

Codes related to P0337 may include:

  • P0338: Crankshaft Position Sensor A Circuit High Input
  • P0335: Crankshaft Position Sensor A Circuit Malfunction


The problem with the Crankshaft Position Sensor A Circuit Low Input is related to DTC code P0337. It signifies that the engine control module is receiving a low-voltage signal from the crankshaft position sensor, which can lead to engine performance issues. To avoid any further damage and restore the vehicle’s performance, timely diagnosis and repair are required. Failure to perform this code could cause engine failure or possible engine damage, so it should be addressed as soon as possible.

P0337 Code – What Does It Mean & How To Fix It