2003 GMC Sierra 2500 HD Q&A

2003 GMC Sierra 2500 HD Question: i have a 2003 gmc sierra 2500hd 6.0 when driving running at reduced power

the truck will run at reduced power and show the same on disply shut tr off and re-start and will run fine until it does it again is not aheating problem.thank you -
Answer 1
SCAN CODES AND POST SO WE CAN ADV -