What Does B1551 Mean?
This code indicates the Body Control Module (BCM) has detected a malfunction in the decklid (trunk) release circuit. The BCM monitors the electrical pathway that activates the trunk release solenoid or actuator and has identified an open circuit, short circuit, or excessive resistance preventing proper operation. This is a manufacturer-specific body control code affecting the convenience and security systems.
Common Causes
40%
Faulty decklid release solenoid or actuator with internal open or short circuit
30%
Damaged, corroded, or loose wiring harness connections between BCM and decklid release actuator
20%
Blown fuse or faulty relay in the decklid release circuit power supply
10%
Failed Body Control Module (BCM) with internal driver circuit damage
Diagnostic Steps
1
Step 1: Perform visual inspection of decklid release solenoid/actuator and all associated wiring for obvious damage, corrosion, loose connectors, or pinched wires at the trunk hinge area where flex damage commonly occurs
2
Step 2: Check fuse box for blown fuse in decklid release circuit (typically 10-20A) and verify relay operation by listening for audible click when trunk release is activated; replace if defective
3
Step 3: Using a digital multimeter, disconnect the decklid release actuator connector and measure resistance across actuator terminals (typical specification 2-8 ohms); infinite resistance indicates open circuit, zero resistance indicates short
4
Step 4: With actuator disconnected, measure voltage at harness connector while activating trunk release (key fob or interior switch); should read battery voltage (12-14V) during activation, confirming BCM output and wiring integrity
5
Step 5: If voltage is present but actuator tests faulty, replace decklid release solenoid/actuator; if no voltage present, check continuity of wiring harness from BCM to actuator and verify ground circuit integrity
6
Step 6: Clear codes, cycle trunk release function multiple times, and verify proper operation; re-scan for codes to confirm repair success
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a malfunction in the decklid (trunk) release circuit. The BCM monitors the electrical pathway that activates the trunk release solenoid or actuator and has identified an open circuit, short circuit, or excessive resistance preventing pro...
The most common cause of B1551 (Decklid Release Circuit Failure) is: Faulty decklid release solenoid or actuator with internal open or short circuit
Typical repair costs for B1551 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is safe to continue driving as it only affects trunk convenience functionality. Repair at your convenience, though it may impact ability to access the trunk using remote or interior release, requiring manual key operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1551 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Convenience Systems
Difficulty
Type
Manufacturer
Recommended Tools
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