DTC P0337 Crankshaft Position Sensor A Circuit Low Input

In the world of automotive diagnostics, understanding On-Board Diagnostic Trouble Codes (DTCs) is essential. Today, our focus is on DTC P0337, specifically the Crankshaft Position Sensor A Circuit Low Input issue. In this comprehensive guide, we will decode the meaning of P0337, explore its symptoms, investigate potential causes, discuss systematic diagnosis, and provide effective solutions for fixing this trouble code. Let’s get started.

1. What does P0337 code mean?

DTC P0337 is a diagnostic trouble code that indicates a low input signal from the Crankshaft Position Sensor A Circuit. The crankshaft position sensor plays a crucial role in monitoring the engine’s position and rotational speed. When it detects a low input signal, the Engine Control Module (ECM) triggers the P0337 code, signifying a problem with the sensor or its circuit.

2. What are the causes of DTC P0337?

Understanding the potential causes of DTC P0337 is fundamental to effective troubleshooting. These causes may include:

  • A malfunctioning or damaged crankshaft position sensor.
  • Wiring issues such as shorts, breaks, or poor connections in the sensor’s circuit.
  • Corroded or damaged connectors.
  • An ECM problem, although this is less common.

Identifying the root cause is the initial step in resolving this problem.

3. What are the symptoms of DTC P0337?

Recognizing the symptoms associated with DTC P0337 is crucial for early detection. Common signs of this issue include:

  • Engine misfires or hesitation during acceleration.
  • Difficulty starting the engine or extended cranking time.
  • Reduced engine performance.
  • An illuminated check engine light (CEL) on the dashboard.

If you experience any of these symptoms, addressing the problem promptly is essential to prevent further damage.

4. How to diagnose DTC P0337?

Accurate diagnosis of DTC P0337 requires a systematic approach. Here’s a step-by-step guide:

If your initial inspection and basic multimeter testing don’t reveal the cause of DTC P0337, specialized diagnostic equipment like an oscilloscope or advanced scan tool with live data capabilities can provide more in-depth insights into the sensor’s performance. This advanced testing allows you to detect subtle issues or intermittent faults that might not be evident through simpler diagnostic methods, helping you diagnose and resolve the problem more accurately.

5. How to fix DTC P0337 problem?

Once you’ve identified the issue causing DTC P0337, it’s time to address it effectively. Here are some steps to consider:

  • Replace the crankshaft position sensor if it is faulty or damaged.
  • Repair or replace any damaged wiring or connectors in the Crankshaft Position Sensor A Circuit.
  • Ensure proper electrical connections and clean corroded connectors.
  • Clear the trouble code using your OBD-II scanner after completing repairs.

Clearing the trouble code is crucial to reset the check engine light and confirm that the problem has been successfully resolved.


In this comprehensive guide, we’ve delved into DTC P0337, the Crankshaft Position Sensor A Circuit Low Input code. Understanding its meaning, symptoms, potential causes, systematic diagnosis, and the importance of clearing the trouble code empowers you to address this issue confidently. Whether you’re an automotive enthusiast or a professional mechanic, resolving these problems with precision and expertise not only restores your vehicle’s performance but also enhances your automotive knowledge. Safe and smooth travels!