WOMS
B code body Medium severity

B1628 PRNDL Reverse Input Open Circuit

The OBD2 code B1628 PRNDL Reverse Input Open Circuit indicates a malfunction in the reverse input circuit of the transmission range sensor, which detects the position of the gear selector

Definition

The OBD2 code B1628 PRNDL Reverse Input Open Circuit indicates a malfunction in the reverse input circuit of the transmission range sensor, which detects the position of the gear selector

Common causes

  • Faulty PRNDL switch
  • Damaged wiring or connectors
  • Poor ground connection
  • Malfunctioning transmission control module (TCM)
  • Corroded terminals
  • Open circuit in the wiring harness
  • Faulty transmission range sensor

Common misdiagnoses

  • Faulty Transmission Range Sensor
  • Wiring Issues or Short Circuits
  • Malfunctioning Engine Control Module (ECM)
  • Defective Transmission Control Module (TCM)
  • Issues with the PRNDL switch
  • Faulty Gear Selector Assembly
  • Problems with the vehicle's battery or charging system

Troubleshooting steps

  1. 1. Check the PRNDL Switch:

    Inspect the PRNDL switch for any visible damage or wear

  2. 2. Ensure that the switch is properly connected and that there are no loose or corroded connectors

  3. 3. Inspect Wiring and Connectors:

    Examine the wiring harness leading to the PRNDL switch for any signs of fraying, breaks, or shorts

  4. 4. Check the connectors for corrosion, dirt, or damage that could affect the electrical connection

  5. 5. Test the PRNDL Switch:

    Use a multimeter to test the PRNDL switch for continuity. Ensure that the switch operates correctly in all positions (P, R, N, D, L)

  6. 6. If the switch is faulty, it may need to be replaced

  7. 7. Check for Ground Issues:

    Ensure that the ground connections related to the PRNDL switch are secure and free of corrosion

  8. 8. A poor ground can lead to open circuit conditions

  9. 9. Inspect the Transmission Control Module (TCM):

    Check for any fault codes in the TCM that may provide additional information about the issue

  10. 10. If necessary, reprogram or replace the TCM if it is determined to be faulty

  11. 11. Look for Related Codes:

    Check for any other OBD-II codes that may be related to the transmission or PRNDL system. This can help narrow down the issue

  12. 12. Perform a Visual Inspection:

    Inspect the transmission and surrounding components for any signs of leaks, damage, or other issues that could affect the PRNDL operation

  13. 13. Clear Codes and Test Drive:

    After performing repairs or adjustments, clear the codes using an OBD-II scanner

  14. 14. Take the vehicle for a test drive to see if the code reappears

  15. 15. Seek Professional Help:

    If the issue persists after performing the above steps, consider consulting a professional mechanic or technician who specializes in transmission systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1628 OBD-II code