B1628 – OBD-II DTC

OBD-II DTC B1628 – PRNDL Reverse Input Open Circuit

DTC B1628 meaning

DTC B1628 refers to a diagnostic trouble code indicating an open circuit in the PRNDL (Park, Reverse, Neutral, Drive, Low) reverse input circuit. This code is typically associated with the vehicle’s transmission control module (TCM) and indicates that the TCM is not receiving the expected signal from the reverse input switch, which is crucial for proper transmission operation.

DTC B1628 symptoms

Common symptoms associated with DTC B1628 may include:

• Transmission not shifting properly
• Inability to engage reverse gear
• Check Engine Light illuminated
• Erratic or unexpected behavior of the transmission

DTC B1628 causes

Several factors can lead to the occurrence of DTC B1628, including:

• Faulty reverse input switch
• Wiring issues, such as damaged or corroded wires
• Connector problems, including loose or corroded connections
• Faulty transmission control module (TCM)

DTC B1628 seriousness

DTC B1628 is considered a serious issue as it can affect the vehicle’s ability to shift into reverse, potentially leading to unsafe driving conditions. It is important to address this code promptly to ensure safe operation of the vehicle and to prevent further damage to the transmission system.

How to diagnose DTC B1628

To diagnose DTC B1628, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the reverse input switch for proper operation.
3. Check the wiring and connectors for any signs of damage or corrosion.
4. Test the continuity of the reverse input circuit.
5. Examine the transmission control module for faults.

How to fix DTC B1628 step-by-step instructions

To fix DTC B1628, follow these steps:

1. Repair or replace any damaged wiring or connectors found during diagnosis.
2. Replace the faulty reverse input switch if necessary.
3. Ensure all connections are secure and free of corrosion.
4. Clear the DTC using an OBD-II scanner.
5. Test drive the vehicle to ensure the issue is resolved and the DTC does not return.

How to erase DTC B1628

To erase DTC B1628, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu on the scanner.
3. Select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to verify that the code has been cleared.

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