What Does B2602 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) did not receive the expected feedback signal from the power sliding door latch mechanism during an unlatch operation. The BCM commands the door to unlatch but fails to detect confirmation that the latch has physically released. This suggests a communication failure, mechanical malfunction, or sensor issue within the power sliding door latch assembly.
Common Causes
40%
Faulty or failed latch position sensor/switch in the power sliding door latch assembly
30%
Damaged or corroded wiring harness between BCM and latch assembly, broken wires at hinge area
20%
Mechanical failure of latch actuator motor or linkage preventing physical unlatch
10%
BCM software fault or connector corrosion at BCM causing signal loss
Diagnostic Steps
1
Step 1: Visually inspect the power sliding door latch assembly for obvious mechanical damage, broken linkage, or obstructions preventing full unlatch operation. Manually test latch operation to confirm smooth mechanical movement.
2
Step 2: Access the latch assembly wiring harness and inspect all connectors for corrosion, pushed-out pins, or moisture intrusion. Pay special attention to the harness routing through the door hinge area where flexing occurs, checking for broken or chafed wires.
3
Step 3: Using a multimeter, backprobe the latch position sensor signal wire while commanding the door to unlatch via scan tool bi-directional controls. Verify voltage changes from locked to unlocked state (typically 0V to 5V or 12V depending on system design).
4
Step 4: With power disconnected, measure resistance across the latch actuator motor terminals (typically 3-8 ohms) and check for continuity in all related ground circuits. Reconnect and verify motor receives power signal (12V) during unlatch command.
5
Step 5: If all electrical tests pass, remove and bench-test the complete latch assembly by applying direct power to actuator motor and verifying position sensor signal changes appropriately during physical latch movement.
6
Step 6: After repairs, clear codes, cycle the power sliding door through complete open/close operations 5-10 times while monitoring live data for proper latch signal feedback throughout all positions.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the Body Control Module (BCM) did not receive the expected feedback signal from the power sliding door latch mechanism during an unlatch operation. The BCM commands the door to unlatch but fails to detect confirmation that the latch has physically released...
The most common cause of B2602 (Missing Latch Signal During Power Sliding Door Unlatch) is: Faulty or failed latch position sensor/switch in the power sliding door latch assembly
Typical repair costs for B2602 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but the power sliding door may not function properly or may fail to latch securely, creating a potential hazard if the door opens unexpectedly during transit. Verify manual door operation and latch engagement before driving, and repair within 1-2 weeks.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2602 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Power Door System
Difficulty
Type
Generic (SAE)
Recommended Tools
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