Tailgate Step Motor Circuit
The B0688 code means the vehicle's onboard diagnostic system has detected: Tailgate Step Motor Circuit. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
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Common Symptoms
- Tailgate or trunk will not open
- Trunk lid does not close securely
- Trunk ajar warning stays on
- Trunk release button does not work
Probable Causes (Ranked by Likelihood)
- Faulty trunk/tailgate latch actuator Very High
- Damaged tailgate wiring harness High
- Failed trunk release switch Moderate
- BCM trunk control circuit fault Low
Step-by-Step Diagnostic Procedure
-
Test trunk release actuator with direct power
-
Inspect tailgate wiring at hinges
-
Check trunk ajar switch operation
-
Verify BCM trunk release output
Frequently Asked Questions
Why will my trunk not open with the button?
The trunk release actuator or switch may have failed. Try using the key or interior release lever as a backup.
Can a faulty trunk latch drain my battery?
If the trunk ajar switch stays active, the trunk light may stay on and eventually drain the battery.
Is it safe to drive with the trunk ajar light on?
Yes, but verify the trunk or tailgate is securely latched. The light may be caused by a faulty switch rather than an open trunk.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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