P0337: Crankshaft Position Sensor A Circuit Low Input

Definition

The OBD2 code P0337 indicates that the crankshaft position sensor A is providing a low voltage signal, which may suggest a malfunction in the sensor or its circuit

Common causes

Faulty crankshaft position sensor
Damaged wiring or connectors
Poor electrical connections
Faulty engine control module (ECM)
Timing belt or chain issues
Oil contamination on the sensor
Incorrect sensor alignment or installation

Common misdiagnoses

Faulty crankshaft position sensor
Faulty camshaft position sensor
Wiring issues or shorts in the sensor circuit
Faulty engine control module (ECM)
Timing belt or chain issues
Ignition system problems
Fuel system issues
Vacuum leaks
Bad ground connections
Sensor connector problems

Troubleshooting steps

1.Check the Code
Use an OBD-II scanner to confirm the P0337 code and check for any additional codes that may provide more context
2.Inspect the Crankshaft Position Sensor
3.Locate the crankshaft position sensor, which is usually found near the crankshaft or flywheel
4.Check for physical damage, corrosion, or loose connections at the sensor and its wiring harness
5.Check Wiring and Connectors
6.Inspect the wiring for any signs of wear, fraying, or damage
7.Ensure that the connectors are clean and securely attached. Look for bent pins or corrosion
8.Test the Crankshaft Position Sensor
9.Use a multimeter to test the resistance of the sensor according to the manufacturer's specifications
10.If the resistance is outside the specified range, the sensor may need to be replaced
11.Check the Power and Ground
12.Verify that the sensor is receiving the correct voltage (usually 5V or 12V, depending on the vehicle)
13.Check the ground connection for continuity and ensure it is secure
14.Inspect the Timing Components
15.If the timing belt or chain is worn or has jumped a tooth, it can affect the crankshaft position sensor's readings. Inspect these components for wear or misalignment
16.Check for Interference
17.Ensure that there are no metal objects or other components that could interfere with the sensor's operation
18.Scan for Other Codes
19.If there are other related codes (e.g., P0340 for the camshaft position sensor), address those as they may be contributing to the issue
20.Clear the Codes and Test Drive
21.After performing the checks and repairs, clear the codes and take the vehicle for a test drive to see if the code reappears
22.Replace the Sensor
23.If all other checks are satisfactory and the code persists, consider replacing the crankshaft position sensor. 1
24.Consult a Professional
25.If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P0337 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1.Check the Code

2.Inspect the Crankshaft Position Sensor

3.Locate the crankshaft position sensor, which is usually found near the crankshaft or flywheel

4.Check for physical damage, corrosion, or loose connections at the sensor and its wiring harness

5.Check Wiring and Connectors

6.Inspect the wiring for any signs of wear, fraying, or damage

7.Ensure that the connectors are clean and securely attached. Look for bent pins or corrosion

8.Test the Crankshaft Position Sensor

9.Use a multimeter to test the resistance of the sensor according to the manufacturer's specifications

10.If the resistance is outside the specified range, the sensor may need to be replaced

11.Check the Power and Ground

12.Verify that the sensor is receiving the correct voltage (usually 5V or 12V, depending on the vehicle)

13.Check the ground connection for continuity and ensure it is secure

14.Inspect the Timing Components

15.If the timing belt or chain is worn or has jumped a tooth, it can affect the crankshaft position sensor's readings. Inspect these components for wear or misalignment

16.Check for Interference

17.Ensure that there are no metal objects or other components that could interfere with the sensor's operation

18.Scan for Other Codes

19.If there are other related codes (e.g., P0340 for the camshaft position sensor), address those as they may be contributing to the issue

20.Clear the Codes and Test Drive

21.After performing the checks and repairs, clear the codes and take the vehicle for a test drive to see if the code reappears

22.Replace the Sensor

23.If all other checks are satisfactory and the code persists, consider replacing the crankshaft position sensor. 1

24.Consult a Professional

25.If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P0337 code