P0337 Fault Code

Crankshaft Position Sensor A Circuit Low Input

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0337 fault code indicates that there is a low voltage signal from the Crankshaft Position Sensor A. This sensor is crucial for determining the position and speed of the crankshaft, which directly affects ignition timing and fuel injection. When the sensor sends a weak signal, the engine control module (ECM) may interpret this as a fault in the sensor or its circuit.

What are the symptoms of the P0337 code?

Symptoms associated with the P0337 code can vary but may include:

• Engine misfire
• Rough idling or stalling
• Difficulty starting the engine
• Reduced engine performance
• Check Engine Light (CEL) illuminated

What causes the P0337 code?

Common causes of the P0337 code include:

• Faulty crankshaft position sensor
• Damaged wiring or connector issues in the sensor circuit
• Improperly grounded sensor
• Issues with the engine control module (ECM)
• Faulty reluctor ring on the crankshaft

How to fix P0337?

To resolve the P0337 code, it's important to perform the following steps:

• Inspect the crankshaft position sensor and its wiring for any visible damage or disconnections.
• Use a multimeter to check the sensor’s output voltage and resistance to ensure it's within specified limits.
• Replace the crankshaft position sensor if it is found to be faulty.
• Repair or replace any damaged wiring or connectors.
• Clear the fault codes and test drive the vehicle to verify that the issue is resolved.