OBD2 B2599: Tailgate Release Circuit Open
Code B2599 indicates that the Body Control Module (BCM) or Liftgate Control Module (LTM) has detected an open circuit in the signal or power supply wire to the tailgate/liftgate release actuator. This prevents the electric release mechanism from working, though manual opening usually still functions.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty tailgate release actuator (internal coil open)
- Damaged, cut, or disconnected wiring between the BCM/LTM and the actuator
- Loose, corroded, or pushed-back terminals at the actuator or module connector
- Blown fuse in the actuator power circuit
- Internal failure of the Body Control Module (BCM) or Liftgate Module
3. Symptoms You Will Notice
- Tailgate or liftgate does not open electrically via switch or key fob
- Manual release still works (e.g., using interior handle or emergency release)
4. Step-by-Step Diagnosis
Check the actuator fuse and replace if blown.
Inspect wiring and connectors between BCM/LTM and actuator for damage, corrosion, or loose pins.
Test the actuator by applying 12V directly; if it doesn't click, replace the actuator.
If wiring and actuator are good, suspect a faulty BCM or LTM and perform module diagnostics.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is safe to drive. The code only affects the electric tailgate release; manual opening still works.
How much does it cost to fix?▼
Repair costs range from $100 to $400, depending on the cause. A simple fuse or wiring repair may be under $150, while replacing the actuator or module can cost $200–$400.