I have a 2006 gmc sierra 1500 with a little bit of a newer engine I put in it about 3 years ago. Ever since then I been fighting with the engine going into “reduced engine power” mode with dtc p2135. I’ve done plenty of research and so far I changed the throttle body about 5 times(lifetime warrenty on throttle body), the peddle position sensor, checked and fixed grounds and plenty of other things that I can’t remember right off the top of my head. After all that im still getting the “reduced engine power” message followed by the dtc p2135. After doing some of the mentioned fixes above it seemed to have help for about a month at least and then back to doing the same thing. Im getting very frustrated with it as I know its probably something simple but just don’t know what to do next.
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