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RIP, Lead Technician
Category: Car
Satisfied Customers: 5591
Experience:  A.S.E. Master Technician, Advanced Level, Smog - European, Domestic, & Asian -- Car Category Mentor
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2000 Pontiac Grand Am: The ABS light..service engine soon..traction

Resolved Question:

I have a 2000 Pontiac Grand Am. The ABS light, service engine soon light, and traction off light all come on at the same time. What does this mean???? This does not happen at every key up and most of the time happens just driving down the road.

Submitted: 10 years ago.
Category: Car
Expert:  RIP replied 10 years ago.

The vehicle needs to go into a facility equipped with factory level diagnostics equippment, to have the ABS (anti-lock brake), PCM (powertrain contorl module - service engine lamp), and the Traction Control sytem evaluated. The three systems work together, and with the Transmisison, to operate the varioous safety features. There are a couple of common sensor failures that trigger these lamps. The VSS (vehicle speed sensor) provides vehicle speed input to the three systems, and the ABS system has 4 other separate wheel speed sensors to provide each wheel signal. When either of these sensors fail, they'll commonly set these lamps and disable the system(s) as well. It's is also been known for these to have the actual ABS module go out and no longer communicate with the other computers. When the repair facility scans the modules, they'll be able to interpret what components are causing the failure.


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