Go5.3tt06

iTrader: (1)

My cousin info me that his 2003 gmc serria 1500hd 6.0 around 160,000 miles. He drove and dying on him. Say cluster show "reduce power" he waited a min try crank again. Run again. Wonder what it cause?? Knock sensor? Crank position sensor?

Suburbazine

Pull codes.

Go5.3tt06

iTrader: (1)

It keep engine light off when you crank up again

Suburbazine

You'll have pending codes set, and you don't have to start the engine to read codes.

batboy

iTrader: (6)

Yes, you have to read the codes. A number of problems can cause the vehicle to go into reduced power or limp mode.