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BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17085
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2004 chevy suburban says reduced engine power will only go

Resolved Question:

2004 chevy suburban says reduced engine power will only go about 10 mph
Submitted: 6 years ago.
Category: Chevy
Expert:  BOBBYSS replied 6 years ago.
HelloCustomer is this the only warning light that is coming on? Does this happen when in the middle of driving? How many miles are on the vehicle?
Customer: replied 6 years ago.
yes only message on digital dash. yes only happens in middle of driving. about 140000 miles
Expert:  BOBBYSS replied 6 years ago.
Okay. Start by checking the ground shown below on the front of the passenger side cylinder head. This can cause ths problem if it is loose or corroded. If it is fine then the problem may be in the throttle control module.

Customer: replied 6 years ago.
there is no ground wire located here on this 04 chevy z71 suburban. ground wire goes from batt. on driver side to under engine. will trace this wire or different one
Expert:  BOBBYSS replied 6 years ago.
Okay. If you cannot see a ground on the front of this head then it is on the rear. Some of these engines had them re-routed to the rear of the head. It is not easy to see.
Customer: replied 6 years ago.
are you talking about the main ground from the battery ? just traced this one from batt to driver side block above oil pan . small ground attached also in same place
Expert:  BOBBYSS replied 6 years ago.
No, this will not go to the battery. It will go into the wiring harness. ALso check the connections shown in the diagram below.

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