B1627 – OBD-II DTC

OBD-II DTC B1627 – PRNDL Reverse Input Circuit Failure

DTC B1627 meaning

DTC B1627 refers to a malfunction in the PRNDL (Park, Reverse, Neutral, Drive, Low) reverse input circuit. This code indicates that the vehicle’s onboard diagnostic system has detected an issue with the signal that indicates the transmission is in the reverse position. The PRNDL switch is crucial for the proper functioning of the transmission and the vehicle’s safety systems.

DTC B1627 symptoms

Common symptoms associated with DTC B1627 may include:

• Transmission not shifting properly
• Inability to engage reverse gear
• Check Engine Light illuminated
• Erratic or incorrect gear indicator on the dashboard
• Potential stalling or hesitation when attempting to reverse

DTC B1627 causes

Several factors can lead to the occurrence of DTC B1627, including:

• Faulty PRNDL switch
• Wiring issues, such as shorts or open circuits
• Corrosion or poor connections in the circuit
• Faulty transmission control module (TCM)
• Software issues in the vehicle’s computer system

DTC B1627 seriousness

DTC B1627 is considered a moderate to serious issue. While it may not immediately affect the vehicle’s ability to operate, it can lead to unsafe driving conditions if the transmission does not function correctly. Ignoring this code can result in further damage to the transmission or related components, potentially leading to costly repairs.

How to diagnose DTC B1627

To diagnose DTC B1627, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the PRNDL switch for any visible damage or wear.
3. Check the wiring and connectors associated with the PRNDL circuit for corrosion or loose connections.
4. Test the PRNDL switch using a multimeter to ensure it is functioning correctly.
5. Examine the transmission control module for any fault codes or issues.
6. Clear the DTC and perform a road test to see if the code returns.

How to fix DTC B1627 step-by-step instructions

To fix DTC B1627, follow these steps:

1. Inspect and repair any damaged wiring or connectors in the PRNDL circuit.
2. Replace the PRNDL switch if it is found to be faulty.
3. Ensure all connections are clean and secure.
4. Reprogram or replace the transmission control module if necessary.
5. Clear the DTC using an OBD-II scanner.
6. Test drive the vehicle to ensure the issue is resolved and the DTC does not return.

How to erase DTC B1627

To erase DTC B1627, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the diagnostic menu on the scanner.
4. Select the option to clear or erase trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.