B1629 – PRNDL Reverse Input Short To Battery
The ODBII code B1629 indicates a malfunction related to the PRNDL (Park, Reverse, Neutral, Drive, Low) switch, specifically that the reverse input is shorted to battery voltage, which can affect the vehicle’s transmission and gear selection.
The severity of ODBII code B1629 PRNDL Reverse Input Short To Battery is moderate.
Common Causes For: B1628 PRNDL Reverse Input Open Circuit
- Shorted wiring or connectors
- Faulty PRNDL switch
- Damaged transmission control module (TCM)
- Corroded or loose electrical connections
- Malfunctioning body control module (BCM)
- Faulty transmission range sensor
- Improperly installed or damaged harnesses
Common misdiagnosis for B1629 PRNDL Reverse Input Short To Battery
- Faulty transmission range sensor
- Wiring issues or shorts in the harness
- Malfunctioning body control module (BCM)
- Defective powertrain control module (PCM)
- Issues with the gear selector assembly
- Faulty connectors or terminals
- Problems with the vehicle’s battery or charging system
Common Troubleshooting Steps
The OBD-II code B1629 indicates a problem with the PRNDL (Park, Reverse, Neutral, Drive, Low) switch, specifically a “Reverse Input Short To Battery.” This code typically suggests that there is an electrical issue related to the reverse gear input signal. Here are some common troubleshooting steps to diagnose and resolve this issue:
- Check the PRNDL Switch:: Inspect the PRNDL switch for any visible damage or wear.
- Ensure that the switch is properly connected and that there are no loose or corroded connectors.
- Inspect Wiring and Connectors:: Examine the wiring harness leading to the PRNDL switch for any signs of fraying, damage, or shorts.
- Check the connectors for corrosion, bent pins, or poor connections.
- Test the PRNDL Switch:: Use a multimeter to test the PRNDL switch for proper operation. Check for continuity in the reverse position and ensure it matches the specifications in the vehicle’s service manual.
- Check for Short Circuits:: Inspect the wiring for any shorts to battery voltage. This can be done by checking the resistance between the PRNDL switch wiring and the battery positive terminal.
- Look for any signs of chafing or pinching in the wiring that could cause a short.
- Scan for Additional Codes:: Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue.
- Inspect the Transmission Control Module (TCM):: If the PRNDL switch and wiring are in good condition, the issue may lie within the TCM. Check for any software updates or known issues related to the TCM for your specific vehicle model.
- Check Ground Connections:: Ensure that all ground connections related to the transmission and PRNDL switch are clean and secure. Poor grounding can lead to erratic behavior and false codes.
- Clear Codes and Test Drive:: After performing the above checks and repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
- Consult a Professional:: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Additional Notes: – Always refer to the vehicle’s service manual for specific diagnostic procedures and specifications. – Safety precautions should be taken when working on electrical systems, including disconnecting the battery when necessary. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1629 code.