I've been having an issue with my Trailblazer now for over 6 months with the dreaded "Reduced Power Mode," and "Stabilitrak Off" message. I've taken it to the mechanic over a dozen times and nothing seems to fix it. I'm desperate. The following codes keep coming up: P0121, P0171, P0174, P060E, P2135, P2138 The mechanic has replaced the Trottle Body Twice, the ECM, and the Pedal. The problem keeps coming back.
I need to take it to a different mechanic now and I have no idea where to start or what to tell them. I don't want to keep throwing parts at it or keep paying hefty repairs. I notice this issue became more frequent (or at least it seems like it's more frequent) when the weather is colder. I don't know if this is a wiring issue or what else it might be. I was just hoping that someone might be able to point me in a direction or at least help me figure out what I should suggest the new mechanic look at.
I'm wondering if ifixedit's solution might work.