Why would Power train light come on with no discernable change in performance? on 2006 Ford Explorer

Driving in 2 wheel drive on a sandy dirt road at 45mph, hit a narrow, deep rut. Wrench light came on. That was 40K miles ago & no noticeable degradation of performance. Ford dealer says solution is to replace the transmission...?! I'd like to trade the car but the value goes down with the power train light on! Any suggestions?

by in Silver City, NM on May 29, 2012
1 answer
ANSWER by on May 29, 2012
have codes scanned and adv