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B2237 Vehicle Signal indicating Park While VSS Present

The OBD2 code B2237 indicates a malfunction related to the vehicle's signal indicating that the transmission is in the park position while the Vehicle Speed Sensor (VSS) is still detecting movement

Definition

The OBD2 code B2237 indicates a malfunction related to the vehicle's signal indicating that the transmission is in the park position while the Vehicle Speed Sensor (VSS) is still detecting movement

Common causes

  • Faulty vehicle speed sensor (VSS)
  • Malfunctioning park/neutral position switch
  • Wiring issues or damaged connectors
  • Faulty transmission control module (TCM)
  • Issues with the engine control module (ECM)
  • Incorrectly set or malfunctioning gear selector
  • Software glitches or programming errors in the vehicle's control modules

Common misdiagnoses

  • Faulty vehicle speed sensor (VSS)
  • Wiring issues or shorts in the harness
  • Malfunctioning transmission range sensor
  • Defective body control module (BCM)
  • Incorrectly calibrated or faulty instrument cluster
  • Issues with the powertrain control module (PCM)
  • Problems with the brake light switch
  • Faulty ignition switch

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Transmission Range Sensor

    The transmission range sensor (also known as the neutral safety switch) is responsible for indicating the position of the gear selector. Inspect the sensor for proper operation and ensure it is correctly aligned and connected

  3. 3. Examine Wiring and Connectors

    Inspect the wiring and connectors associated with the transmission range sensor and the VSS. Look for any signs of damage, corrosion, or loose connections that could affect signal transmission

  4. 4. Test the Vehicle Speed Sensor (VSS)

    Check the VSS for proper operation. You can do this by measuring the output voltage or resistance according to the manufacturer's specifications. If the VSS is faulty, it may need to be replaced

  5. 5. Check for Ground Issues

    Ensure that all ground connections related to the transmission and VSS are secure and free of corrosion. Poor grounding can lead to erratic signals

  6. 6. Inspect the Engine Control Module (ECM)

    If all other components check out, there may be an issue with the ECM. Ensure that the ECM is functioning properly and that it is receiving the correct signals from the transmission range sensor and VSS

  7. 7. Look for Mechanical Issues

    Inspect the transmission for any mechanical issues that could affect the operation of the range sensor or VSS. This includes checking for proper fluid levels and any signs of internal damage

  8. 8. Perform a System Reset

    After addressing any identified issues, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  9. 9. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the B2237 code

  10. 10. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the B2237 code