1998 pontaic grand Prix gt abs and trac light has been on for 3 months. took it to have it check said that my speed sensor was bad .I replaced both front now getting air bag problem

Asked by Oct 24, 2015 at 07:28 PM

Question type: Maintenance & Repair

Any suggestions on how to find out whats really the issue

4 Answers


Probably both are the same problem related to a wheel pick-up sensor. All 4 wheels have a pickup (usually just behind the brake rotor) telling the computer what speed the wheel is rotating... if it sees a different speed in any two wheels it knows it's either traction or brakes.. A wire may have come loose on a pick-up. A likely place to start is if you had brake work ,a flat or any reason you may have worked around a wheel

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Can I try resetting the abs if I can how


The ABS sensors on these cars are part of the wheel hub bearing assembly. You can tell which one(s) are bad by using a scan tool capable of reading the ABS computer. When there's a problem with the ABS the traction control system is also disabled. Hence the "trac off" light. If the ABS light stays on immediately after you start the engine, one of the hubs is bad. If it doesn't come on until the car starts moving it's going to be the pump and modulator assembly. There's no need to reset the ABS computer. It resets each time the engine is shut off. As for the airbag light. If you have steering wheel radio controls that aren't working it's going to be the clock spring in the steering column just behind the steering wheel. Otherwise you'll need a scan tool to communicate with the airbag (SRS) computer. You'll get a trouble code telling you what the problem is. The second prime suspect is the impact sensors behind the front bumper. They tend to get water condensation in them and stop working. Same deal with the airbag computer. It resets itself each time you shut off the engine. HTH. -Jim

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