B1551 — Decklid Release Circuit Failure #

Note: The code description may vary depending on the vehicle manufacturer.

• Decklid Release Circuit Malfunction (Ford, Lincoln, Mercury)
• Trunk Release Circuit Fault (General Motors, Chevrolet, Cadillac)
• Tailgate Release Circuit Failure (Chrysler, Dodge, Jeep)

Summary of Code B1551 #

The B1551 code is a Body (B) Diagnostic Trouble Code (DTC) that signals a malfunction in the decklid release circuit. The decklid typically refers to the trunk lid in sedans or the rear hatch in hatchbacks and SUVs. When this code appears, the vehicle’s onboard computer has detected an electrical issue—such as an open, short, or voltage irregularity—within the system responsible for electronically releasing the trunk or tailgate. Depending on the OEM (Original Equipment Manufacturer), the description and behavior may differ slightly, but the underlying problem remains a failure in the release mechanism’s electrical pathway.

Common Symptoms for Code B1551 #

When the B1551 code is present, certain electrical and convenience features related to the trunk or decklid may stop working as intended. The most obvious sign is the trunk not opening with the button or key fob. However, other symptoms can also manifest, affecting everyday usability and sometimes security.

• Trunk or tailgate will not open via button, switch, or remote key fob
• Intermittent or delayed trunk release response
• Trunk release button feels unresponsive
• Warning light or message on the dashboard (e.g., “Trunk Ajar” or “Decklid Open”)
• Manual key operation may still work (if equipped)

Probable Causes for Code B1551 #

There are several potential causes for a B1551 code, but some are more common than others. Understanding these can help prioritize diagnosis and repairs. Typically, issues range from simple electrical problems to component failures:

1. Faulty decklid/trunk release switch or button
2. Broken or damaged wiring in the release circuit
3. Defective decklid/trunk release actuator (the motor or solenoid that unlocks the trunk)
4. Blown fuse or faulty relay associated with the trunk release system
5. Poor ground connection or corroded connectors
6. Malfunctioning Body Control Module (BCM), which manages many of the vehicle’s electrical functions

Step-by-Step Diagnostic for Code B1551 #

A methodical approach will save time and prevent unnecessary parts replacement. Here’s how a technician (or an advanced DIYer) should tackle the diagnosis:

• Verify the code with an OBD-II/EOBD scanner and check for additional related codes.
• Test the trunk release switch/button for proper function using a multimeter.
• Inspect the wiring and connectors between the switch, actuator, and BCM for visible damage, corrosion, or loose connections.
• Check the trunk release fuse and relay—replace if blown or faulty.
• Test power and ground at the trunk release actuator; if power and ground are present, but the actuator does not operate, the actuator is likely faulty.
• If all hardware checks out, perform a diagnostic scan of the BCM for internal faults or software issues.
• After repairs, clear the code and test the trunk release function to confirm resolution.

Possible Repairs for Code B1551 #

Once the source of the B1551 has been pinpointed, repairs typically focus on restoring the integrity of the circuit and its components. The fix depends on the root cause identified during diagnosis:

• Replace a defective decklid/trunk release switch or button
• Repair or replace damaged wiring or connectors in the release circuit
• Replace a faulty trunk release actuator (motor or solenoid)
• Install a new fuse or relay if the original is blown or malfunctioning
• Clean or repair poor ground connections and corroded terminals
• If necessary, reprogram or replace the Body Control Module (BCM)

Is It Safe to Drive with Code B1551? #

Yes, but with limitations. Driving with a B1551 code typically does not affect vehicle safety, drivability, or core mechanical functions. However, you may lose the convenience and security of remote trunk access. If you need regular access to the trunk or if the trunk is stuck open, address the issue promptly to avoid theft or exposure to the elements.

Vehicles Most Commonly Affected by Code B1551 #

While B1551 can appear on many modern vehicles, some makes and models are more prone to decklid/trunk release issues due to design and part sourcing. The following vehicles are frequently associated with this code:

• Ford Fusion, Taurus, Focus, Mustang
• Lincoln MKZ, MKT
• Chevrolet Malibu, Impala, Cruze
• Cadillac CTS, ATS
• Chrysler 300, Dodge Charger, Dodge Dart
• Jeep Grand Cherokee, Jeep Compass

Common Mistakes & Best Practices for Code B1551 #

It’s easy to jump to conclusions with body electrical codes. Avoid these pitfalls and follow industry best practices for effective repairs:

• Replacing the trunk actuator without checking for blown fuses or damaged wiring
• Ignoring intermittent electrical connections—wiggle test all connectors
• Overlooking ground points and corrosion, especially in older vehicles
• Not scanning for additional related codes (sometimes multiple circuits are affected)
• Failing to clear codes and retest after repairs

Quick FAQ for Code B1551 #

Q: Can I open the trunk manually if I have a B1551 code?
A: Most vehicles allow manual trunk opening with a key or interior release lever, even if the electronic system fails.

Q: Will a B1551 code cause any other electrical problems?
A: Rarely, but if the root cause is a wiring issue or Body Control Module fault, other body electrical features (like door locks or interior lights) could also be affected. Always scan for multiple codes.