Power Liftgate System Voltage High
The B0637 code means the vehicle's onboard diagnostic system has detected: Power Liftgate System Voltage High. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $600 (parts and labor)
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Common Symptoms
- Power liftgate does not open
- Liftgate does not close completely
- Liftgate reverses while closing
- Power liftgate beeps but does not move
Probable Causes (Ranked by Likelihood)
- Faulty liftgate motor or strut Very High
- Damaged liftgate wiring harness High
- Failed liftgate latch assembly Moderate
- Liftgate control module failure Low
Step-by-Step Diagnostic Procedure
-
Test liftgate motor with direct power
-
Inspect liftgate hinge wiring for damage
-
Check liftgate latch operation manually
-
Scan liftgate module for fault codes
Frequently Asked Questions
Why does my power liftgate reverse when closing?
The pinch protection sensor detects an obstruction and reverses. Clean the sensor strip along the liftgate edge or check for misalignment.
Can I open the liftgate manually?
Yes, most power liftgates have a manual release handle or key cylinder for emergency opening.
Why does the liftgate not open fully?
The height setting may be adjusted too low, or the power struts may be weak and unable to fully lift the gate.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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