B1553 — Decklid Release Circuit Short To Battery #

Please note: The description of this code may vary depending on the vehicle manufacturer. Below are common alternate names for DTC B1553 as used by different OEMs.

• Ford: Decklid Release Circuit Short To Battery
• General Motors (GM): Trunk Release Circuit Shorted High
• Toyota/Lexus: Back Door Opener Circuit Short to Battery
• Nissan: Trunk Lid Opener Relay Circuit High Voltage

Summary of DTC B1553 #

DTC B1553 indicates the decklid release circuit—the electrical pathway controlling the automatic opening of the trunk or rear hatch (also called decklid)—is experiencing a short to battery. This means the circuit is seeing an unintended direct voltage connection, typically 12V, where it shouldn’t. This code is detected by the Body Control Module (BCM), an electronic controller managing vehicle body functions. The BCM sets B1553 when it senses voltage on the decklid release line that is much higher than expected, which could lead to malfunctions or even unintentional trunk opening. Understanding and addressing this issue is crucial, as it may affect both vehicle security and convenience.

Common Symptoms for Code B1553 #

When B1553 appears, you may notice a variety of symptoms, some subtle and others more obvious. The most common sign is the inability to open the trunk using the switch or key fob. In some cases, the trunk may unexpectedly pop open, or the trunk release button may seem dead. Electrical warning messages related to trunk operation might also appear on the dashboard. In rare cases, you could notice battery drain or electrical noises near the trunk latch area.

• Trunk/decklid does not open with switch or key fob
• Trunk opens by itself unexpectedly
• Warning message on dashboard (e.g., “Trunk Open” or “Check Trunk System”)
• Unresponsive trunk release button
• Unusual clicking or buzzing near trunk latch
• Unexplained battery drain (rare)

Likely Causes for Code B1553 #

The most probable causes of a B1553 code are faults in the electrical circuit powering the trunk release mechanism. These can range from wiring issues to component failures. Below is a list of causes, ordered from most to least common, based on field experience and OEM service bulletins:

1. Damaged or pinched wiring harness in the decklid/trunk area, especially where wires flex during trunk operation
2. Faulty trunk release switch (shorted internally to power)
3. Water intrusion or corrosion at the trunk latch or connector
4. Shorted trunk release solenoid or actuator
5. Incorrect aftermarket installation (e.g., alarm, remote start, or audio equipment tapping into trunk wiring)
6. Body Control Module (BCM) failure (least common)

Step-by-Step Diagnosis for B1553 #

A methodical approach to diagnosing B1553 is essential for accurate repairs and to avoid replacing parts unnecessarily. Always follow proper safety procedures and, if possible, consult your OEM’s wiring diagrams before starting.

• 1. Scan for related codes: Check for other body or electrical DTCs that may provide clues (e.g., BCM, trunk switch, or latch codes).
• 2. Inspect trunk wiring: Carefully examine the wiring harness between the body and trunk/decklid, focusing on areas that flex or rub. Look for chafed, pinched, or broken wires.
• 3. Check connectors: Disconnect and inspect all connectors related to the trunk release circuit for corrosion, moisture, or bent pins.
• 4. Test the trunk release switch: Use a multimeter to ensure the switch is not internally shorted to battery voltage.
• 5. Test the trunk release solenoid/actuator: Measure resistance and check for continuity to ground or battery where it shouldn’t exist.
• 6. Verify for aftermarket modifications: Inspect for any non-OEM wiring or components spliced into the trunk circuit.
• 7. Check BCM outputs: If all wiring and components test fine, consult OEM procedures to test the BCM’s control of the trunk release circuit.

Possible Repairs for Code B1553 #

Repairing a B1553 code will depend on the root cause found during diagnosis. Always use OEM parts and wiring standards when making repairs to ensure proper function and safety.

• Repair or replace damaged wiring harnesses or connectors (including fixing pinched, chafed, or corroded wires)
• Replace faulty trunk release switch if found shorted to battery voltage
• Clean and seal connectors exposed to moisture or corrosion
• Replace the trunk release solenoid or actuator if shorted internally
• Remove or correct improper aftermarket wiring
• Replace the BCM only if all other possibilities are ruled out and according to OEM diagnostic confirmation

Is It Safe to Drive with Code B1553? #

Limited use is possible, but not recommended for extended periods. While B1553 typically does not affect core drivability, it can compromise vehicle security (trunk may not latch or could pop open while driving), and could lead to battery drain if the circuit remains powered. If your trunk is stuck open or won’t latch, secure it before driving. Address this code promptly to avoid further electrical issues or inconvenience.

Vehicles Most Commonly Affected by B1553 #

B1553 is most often seen on vehicles equipped with electronic trunk or decklid release systems, particularly those from major manufacturers using BCM-controlled body systems. The following vehicle types and models are reported more frequently:

• Ford: Fusion, Focus, Taurus, Mustang (2008+)
• GM: Chevrolet Malibu, Impala, Cruze, Cadillac CTS
• Toyota: Camry, Avalon, Corolla (with electronic trunk release)
• Nissan: Altima, Maxima, Sentra
• Lexus: ES, GS, RX

Common Mistakes & Best Practices for B1553 #

To avoid wasted time and money, and ensure a lasting repair, be mindful of these frequent errors and follow these best practices:

• Replacing the trunk latch or switch without checking wiring—often, the problem lies in a damaged wire harness.
• Ignoring evidence of water intrusion—moisture can cause intermittent shorts that are hard to track.
• Overlooking aftermarket wiring taps—non-OEM modifications can introduce new faults.
• Skipping BCM testing—rarely the cause, but a failed BCM can mimic wiring faults.
• Always reseal and protect any repaired wiring to prevent future issues.

Quick FAQ for B1553 #

Have more questions? Here are fast answers to the most common concerns about DTC B1553.

• Can I reset B1553 by disconnecting the battery?
  Disconnecting the battery may temporarily clear the code, but unless the underlying short is fixed, B1553 will return as soon as the circuit is powered again.
• Will replacing the fuse fix B1553?
  If the fuse is blown, it may be a symptom, not the root cause. Simply replacing it without addressing the short to battery will not resolve the issue.