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Ron Z.
Ron Z., - Chevy Tech -
Category: Chevy
Satisfied Customers: 18773
Experience:  18+yrs experience. State Inspector and Chevy Diagnostics
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The Brake Assist Light, Service Traction Control and Brake

Customer Question

The Brake Assist Light, Service Traction Control and Brake System lights are coming on. 2007 Chevy Impala LTZ
. Brakes were done recently
Submitted: 1 year ago.
Category: Chevy
Expert:  Ron Z. replied 1 year ago.

When all of these lights come on at the same time, this is most commonly due to a problem in one of the sensors that plays a role in all of these systems. Unfortunately, there are a few different sensors that are used by all these systems, so to take a guess as to which one and be correct would be impossible. I can tell you, that on GM vehicles, the Wheel Speed Sensors (aka ABS Sensors) are fairly common fail items and when faulty, can set all of the lights you mention. There is one of these Wheel Speed Sensors at each wheel. No need to replace all of them when only one is faulty. SO, at this point, we'll need to find a shop taht has a scan-tool that can read codes from the ABS/Trac system. "SOME" local parts stores, like AutoZone, can read these codes. If you cannot find an AutoZone location with the correct scan-tool, then a shop will be needed. In the meantime, carefully inspect the electrical connectors and wire harnesses to the wheel speed sensors for any loose, broken or damaged wires. Inspect the tone ring that the sensros are reading for any missing or broken 'teeth'. If there are no visible problems, then unfortunately, we'll need those diagnostic trouble codes to point us in the right direction of which sensor has the fault. Please remember to leave a rating using the rating system at the top of this page or accept the answer so I may be credited for this Q&A. You can ask follow-up questions any time, even after you rate or accept.

Expert:  Ron Z. replied 1 year ago.


Expert:  Ron Z. replied 1 year ago.