I just got a 2009 Vibe AWD with 150,000 miles for my son. Overall car is in great shape but has one thing I need to sort out. When you start it, there are no CEL's on the dash. But...the car will only drive in Limp mode until you press the little switch to turn off traction control system. Then it drives no problem and the little yellow light for traction system shows up on the dash.
Since it's not throwing any CEL codes...where should I start on diagnosing this?
Would it be a wheel sensor or should I look at replacing the PCM? Anywhere else to look?
Thanks for any help that can be provided.
Phil