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Hello all, new member/Acadia owner here. We just bought a 2008 Acadia AWD with 150,000 miles on it for a second car for my wife. We have an intermittent issue that possibly occurs with wet weather/car wash. 99% of the time the car will run fine, but sometimes it will pop up and give BOTH a flashing engine light AND "Service traction control", which is odd as the two seem unrelated. Sometimes with the flashing engine light it will have a miss, sometimes not. It is corrected by shutting the engine off and re-starting. Then no lights or anything until next time. My mechanic thinks it's a connection somewhere getting wet. Have any of you had this issue and if so, were you able to track it down?
TIA.
 

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Check your brake fluid. Mine ended up being the solenoid things in the transmission. Messy but cheap fix. I chased it for over a year before I figured it out. I cleaned all computer electrical connections and lubed them with electrical grease to no avail before finally finding the transmission fix.
 
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