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post #1 of 4 (permalink) Old 12-23-2012, 05:57 PM Thread Starter
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Service Traction and EVAP?

Hi, I just bought a 2007 Cobalt LT a few days ago (with the 2.2L Ecotec engine) and it had the engine light on since I bought it. It turns off occasionally, and it was checked and I was told it was an EVAP code, and something in the gas tank needs to be cleaned as it takes gas very slowly. However, since I got it the "service traction" messages shows up, and the traction control turns off. But once the car is turned off, the light goes out and stays out for a while and trac seems to function normally. Ive never had any issues with the trac in my previous car (2000 Grand Prix GT). Im not familiar at all with these cars and their engines, as its a very big change from my grand prix. If anyone knows anything about what this EVAP thing in my gas tank that needs to be cleaned or why my service trac comes on, it would be super appreciated.

**also forgot to add, right after the service traction comes on the car seems like its going to stall and is very jerky for like a minute. then even with the trac light on, it drives completely normal. the shaking reminds me of what happened when the o2 sensor went in my GP, but I was told nothing is wrong with this o2 sensor.

Last edited by soonincx; 12-23-2012 at 06:00 PM.
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post #2 of 4 (permalink) Old 12-23-2012, 06:21 PM
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its probably a lazy speed sensor on one of your front wheels or a loose connector. Chev's are horrible for abs lights. The grand prix's (I owned a 1997 grand prix) used to have the abs sensor wires break and they had to be fixed.

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post #3 of 4 (permalink) Old 12-23-2012, 06:32 PM
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If it's been sprayed against rust and the filler neck vent wasn't shielded then you might need to clean the rust proofing guck from the vent. Sometimes just a high pressure spray clears it.

Definitely wheel bearing speed sensor for your other problem. Car probably goes into power management until code comes up, thus the shaking.
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post #4 of 4 (permalink) Old 12-26-2012, 10:13 AM
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Welcome to the forum, soonincx!

If you should ever have questions about warranty or recall information, or wanted assistance in the process of working with a dealership, please get in touch! I can be reached either by private message on the forum or email (see my signature) and ask that you include the last 8 digits of your VIN with your inquiry.

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