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2004 GMC Sierra anti-lock braking system

Tiny
TIGGER4KEC
  • MEMBER
  • 2004 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 76,000 MILES
The other day I cut my truck off, keys out and I heard something running. I found out that its the motor for the anti-lock braking system underneath the driver's door. It will not stop running - looking for some advice. If I leave it like it is it will run down the battery. Someone told me that all of the brake lights are tied into this device - is this true? What would make it continue to run and how do I troubleshoot?
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Tuesday, February 17th, 2009 AT 6:01 PM

2 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Most likely a relay is stuck. Remove ABS fuse and re-insert, see if that stops the problem, at least temporarily.

If so, then replace relay.

If ABS light is on, then have system scanned by trusted garage with chassis scanner ("C" code).
While most autoparts stores will scan the PCM ("P" codes). They cannot scan chassis codes.
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Wednesday, February 18th, 2009 AT 7:05 AM
Tiny
ED_12ROD
  • MEMBER
  • 12 POSTS
You might want to check your pcv valve on the brake cylinder it could be bad thats why the light is turning on.
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Friday, August 7th, 2009 AT 10:20 AM

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