2002 GMC Sierra ABS breaks

Tiny
FITPL
  • MEMBER
  • 2002 GMC SIERRA
2002 GMC Sierra V8 Automatic 120000 miles

hello, I have a 2002 GMC 2 x 4, 4 door, "V" (vin number) motor. 120,000 miles. Question: when I turn the steering wheel to the left, it activates the ABS break light on the dash and if I apply the breaks, I can the pulse in the peddle. What is causing this?
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Sunday, August 22nd, 2010 AT 11:46 AM

3 Replies

Tiny
CARADIODOC
  • EXPERT
Hi fitpl. Welcome to the forum. Since the ABS light has come on, there will be a diagnostic fault code stored in the computer. You'll need to find a mechanic with a scanner that can access that computer to read the code(s) that will indicate the circuit with the problem.

Start by looking at the connectors for the two front wheel speed sensors. Check for corrosion on the pins or signs of frayed wires. The light turning on indicates an electrical problem was detected such as a break in the circuit to a sensor, or the signal was lost from one wheel while the brake pedal was not applied. The system activating when it shouldn't points to a loss of signal from one wheel while there is NOT an electrical failure that disables the system. That type of failure could be caused by metal filings or rust buildup on the magnet on the end of a sensor.

Also check each tone ring, (toothed ring) for cracks. On some models, the tone rings are built into the wheel bearing assemblies and cause a real lot of trouble from play in the bearings. The only fix for those is to replace the entire wheel bearing assembly but you'll need the scanner to identify which sensor signal is dropping out.

Caradiodoc
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Sunday, August 22nd, 2010 AT 12:23 PM
Tiny
FITPL
  • MEMBER
Thank you for your answer to my question. I found that a support for the ABS sensor cable at the left front wheel had come loose. Once I replaced the support, the problem went away. A simple repair!
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Tuesday, August 31st, 2010 AT 6:56 AM
Tiny
CARADIODOC
  • EXPERT
All right. One in a row! Happy to hear it's fixed.

Caradiodoc
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Tuesday, August 31st, 2010 AT 4:15 PM

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