Power Sliding Door Latch Signal Missing
Diagnostic trouble code B2602 indicates that the power sliding door control module or body control module (BCM) did not receive the expected latch release signal during the door opening sequence. This signal confirms that the door latch has disengaged before the motor attempts to slide the door open. Without it, the system aborts the automatic opening procedure as a safety precaution to prevent the motor from forcing the door while it is still latched.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or stuck power sliding door latch assembly
- Damaged latch position sensor or switch
- Open or shorted wiring between the latch and control module
- Corroded or loose electrical connectors in the door or track harness
- Faulty power sliding door module (PSDM) or BCM
3. Symptoms You Will Notice
- Power sliding door fails to open automatically
- Door may open manually but not with power assist
4. Step-by-Step Diagnosis
Scan for B2602 and related codes, then clear and retest
Inspect latch mechanism for binding or damage
Check latch position sensor signal with a multimeter or scan tool
Test wiring and connectors for continuity, shorts, and corrosion
If all else passes, suspect a faulty PSDM or BCM
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is safe to drive. The power sliding door feature will be disabled, but the door can still be opened and closed manually.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the issue is a simple wiring repair or requires replacing the latch assembly or control module.