I have a 2007.5 LMM with "reduced engine power" light on. I have a PPE programmer and the DTC codes that are displayed are "02B9" and "2463". I cannot find what these codes mean anywhere. I can clear the codes and they instantly return. The truck has a terrible knock and lightly smokes. This truck has 40k miles and is never raced or abused. Any assistance would be greately appreciated.

I did get answers and service from my local GM dealer. Truck is back and running perfect. Thanks for all replies and knowledge from the 58 viewers who looked at the question and didn't know Jack. Enjoy your old man site, whose members sit around and talk about their stock trucks. Lol

I have a 2008 LMM with the "reduced engine power" light on. I don't have a programmer or code reader, but I suspect mine has the same problem. Mine has 42k miles and has never been abused. My DPF might be stopped up since I drive a short distance to and from work in slow traffic.

I did get answers and service from my local GM dealer. Truck is back and running perfect. Thanks for all replies and knowledge from the 58 viewers who looked at the question and didn't know Jack. Enjoy your old man site, whose members sit around and talk about their stock trucks. Lol

What a D1CK!

What a D1CK!
NO KIDDING!

Friggen low-posters come in here, nothing in their sig line, and get all bent out of shape when their ? wasn't answered fast enough.

Not to mention trying to run a tuner on a DPF truck with the DPF still intact!