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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1693
Experience:  GM Grand Master Technician 2007. 14 year experience.
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I have a 2003 Chevy 2500HD, along the hiway my check engine

Customer Question

I have a 2003 Chevy 2500HD, along the hiway my check engine light come on and it reads "reduced engine power" and I can only travel at 10-15 mph, however after I shut off the engine for a while itll run normal but the check engine light stays on.
JA: Does the light stay on, or does it blink?
Customer: it stays on, and after I shut the engine off, then start up again the "check engine" light is off.
JA: What is the model of your '03 GMC?
Customer: 2500 HD 350 engine.
JA: Are you fixing your 2500 yourself? What have you tried so far?
Customer: nothing, Ive had this happen before last year as a matter of fact, but a day or two had it in the shop.
JA: Anything else you want the mechanic to know before I connect you?
Customer: The mec
Submitted: 11 months ago.
Category: GMC
Expert:  Jake Cheek replied 11 months ago.

Hi, I see you have two questions submitted. Is the truck a gas or diesel engine? Have you had the codes scanned?

Customer: replied 11 months ago.
no its a gas, and no I didn't have it scanned.
Expert:  Jake Cheek replied 11 months ago.

Okay to continue we will need to have the codes pulled. Local auto parts stores usually do that for free.

Customer: replied 11 months ago.
Ok after I shut the truck off for a while and start up again it runs fine I can go at normal speed back to town.
Expert:  Jake Cheek replied 11 months ago.

Yes, that can be the case if the fault is intermittent. Usually restarting the truck will clear any faults but leave a code stored in the ECM.