B1551 – Decklid Release Circuit Failure

The ODBII code B1551 indicates a malfunction in the decklid release circuit, which may involve issues with the wiring, switch, or the electronic control module related to the trunk or hatch release system.

The severity of ODBII code B1551 Decklid Release Circuit Failure is generally considered moderate.

Common Causes For: B1550 Power Window Master Circuit Short To Ground

• Faulty decklid release switch
• Damaged wiring or connectors in the circuit
• Malfunctioning decklid release actuator
• Blown fuse related to the decklid release system
• Corroded or poor ground connections
• Faulty body control module (BCM)

Common misdiagnosis for B1551 Decklid Release Circuit Failure

• Faulty decklid release switch
• Malfunctioning body control module (BCM)
• Wiring issues or shorts in the circuit
• Defective decklid latch assembly
• Battery or power supply problems
• Corroded connectors or terminals
• Issues with the vehicle’s key fob or remote entry system

Common Troubleshooting Steps

The OBD-II code B1551 indicates a “Decklid Release Circuit Failure.” This code typically relates to issues with the trunk release mechanism in a vehicle. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check the Owner’s Manual: Refer to the vehicle’s service manual for specific information related to the B1551 code, including wiring diagrams and component locations.
• Inspect the Decklid Release Switch:
• Test the switch for proper operation. Use a multimeter to check for continuity when the switch is pressed.
• If the switch is faulty, it may need to be replaced.
• Examine the Wiring and Connectors:
• Inspect the wiring harness and connectors associated with the decklid release circuit for any signs of damage, corrosion, or loose connections.
• Repair or replace any damaged wiring or connectors.
• Check the Decklid Release Actuator:
• Test the actuator to ensure it is functioning correctly. You can do this by applying direct power to the actuator to see if it operates.
• If the actuator is faulty, it may need to be replaced.
• Inspect the Body Control Module (BCM):
• The BCM controls various electrical functions, including the decklid release. Check for any fault codes in the BCM and ensure it is functioning properly.
• If the BCM is faulty, it may need to be reprogrammed or replaced.
• Look for Ground Issues:
• Ensure that the ground connections for the decklid release circuit are secure and free of corrosion. A poor ground can cause circuit failures.
• Check for Short Circuits:
• Use a multimeter to check for short circuits in the wiring. A short can cause the circuit to fail and trigger the B1551 code.
• Clear the Code and Test Drive:
• After performing repairs, clear the code 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 best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1551 code.