B1551 – OBD-II DTC

OBD-II DTC B1551 – Decklid Release Circuit Failure

DTC B1551 meaning

DTC B1551 refers to a fault in the Decklid Release Circuit. This diagnostic trouble code indicates that there is a malfunction in the system responsible for controlling the release of the vehicle’s trunk or decklid. The code is typically set when the powertrain control module (PCM) detects an issue with the electrical circuit that operates the decklid release mechanism.

DTC B1551 symptoms

Common symptoms associated with DTC B1551 may include:

• The trunk or decklid does not open when the release button is pressed.
• Intermittent operation of the decklid release.
• Dashboard warning lights may illuminate.
• Other electrical components related to the trunk may also malfunction.

DTC B1551 causes

Several factors can lead to the setting of DTC B1551, including:

• Faulty decklid release switch.
• Damaged wiring or connectors in the decklid release circuit.
• Defective trunk latch or actuator.
• Issues with the powertrain control module (PCM).
• Blown fuses related to the decklid release system.

DTC B1551 seriousness

The seriousness of DTC B1551 can vary. While it may not affect the vehicle’s drivability, it can prevent access to the trunk, which may be inconvenient. If left unaddressed, it could indicate underlying electrical issues that may lead to further complications.

How to diagnose DTC B1551

To diagnose DTC B1551, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1551 code.
2. Inspect the decklid release switch for any visible damage or wear.
3. Check the wiring and connectors for continuity and signs of corrosion.
4. Test the trunk latch and actuator for proper operation.
5. Examine the fuses related to the decklid release circuit.
6. Clear the code and perform a functional test of the decklid release system.

How to fix DTC B1551 step-by-step instructions

To fix DTC B1551, follow these steps:

1. Identify and replace any blown fuses related to the decklid release circuit.
2. Repair or replace damaged wiring and connectors in the circuit.
3. Replace a faulty decklid release switch if necessary.
4. Test and replace the trunk latch or actuator if they are not functioning correctly.
5. Recheck the system for proper operation after repairs.
6. Clear the DTC using an OBD-II scanner and verify that the code does not return.

How to erase DTC B1551

To erase DTC B1551, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. 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.