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Old 03-15-2007, 10:28 AM
JenW JenW is offline
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Question 99 Grand AM Se Trac Off and Service Engine Light

My 99 Grand Am started throwing up the Trac Off light several months ago. It would come on then go off. Now it is on permanently. The service engine light also started coming on and is on permanently now. When the trac off light is on, the car will jump RPMs and the motor will surge up and down until I get down below about 1000 rpms. The cruise will also shut off when the car goes down a hill. It happens as soon as the cars engine power backs off and goes idle as it starts down the hill.

After reading the forums I decided to change my front hubs. After many tools and frustration I put the new hubs on. I unhooked the battery to reset the computer and there were no lights when I started it up. I drove it about 25 miles on the highway and all of a sudden the trac off light came on again and then about 10 miles later the check engine light came on. It was the same issues as before. Does anyone else have any suggestions that might be causing my trac off problem? Putting new tires on? Replacing the rear hubs? I'm at a loss to what I should do next. Any help would be appreciated.

Jen
99 Grand Am SE 4 cyl
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Old 03-15-2007, 10:53 AM
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BNaylor BNaylor is offline
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Re: 99 Grand AM Se Trac Off and Service Engine Light

Welcome to AF.

Since the SES/CEL light is turning on the best thing to do is get it scanned. Post the DTC error codes. Certain DTCs will inhibit cruise control operation when they set.

On ABS scanning must be done with an ABS capable scanner or on a GM dealer's Tech II scan tool.



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