"Reduced Engine Power"

rebelracer79 said:

Try new air filter and fuel filter and spray the throttle body with carb cleaner

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travisstorma said:

Do you know which codes were read from the system?

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4play said:

This really sounds like a wiring problem. How sure are you that the wiring was checked good, particularly the connection, pins and wiring at the throttle body and the ground circuit behind the intake manifold?

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p238shooter said:

OK, this will sound goofy, but I had the same problem. Replaced the Battery and it has not re-occurred in a year.. Start out by disconnecting the battery 10 or so minutes. It should temp fix the problem. If it comes back, change the battery. My battery had a few years on it but was still starting pretty well, but just a little slower than I remember. Did a lot of internet research, almost taking it in for at throttle body sensor or accelerator module. It wound up being a cheap real fix.

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NightShade said:

Found this hope it helps

Document ID# 1541463
2004 GMC Truck GMC C Sierra - 2WD

SES Light and Reduced Engine Power with a DTC P1516: DTCs P0120 , P0220 , P1514 , P1515 , P1518 and P2135 May Be Present; 04 Trucks and Utilities with GENIII V-8 Engines - kw 4.8 5.3 6.0 #PIP3089 - (Jul 30, 2004)
SES Light and Reduced Engine Power with a DTC P1516: DTCs P0120, P0220, P1514, P1515, P1518 and P2135 May Also Be Present.

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:
SES light and reduced engine power with a DTC P1516. DTCS P0120, P0220, P1514, P1515, P1518 and P2135 may also be present.

Recommendation/Instructions:
If the SI diagnostics do not isolate the cause, inspect the Yellow TAC Motor Control Circuit (581) about 1 inch to 4 inches from the throttle body connector to see if it is broken inside of the insulation. Repair as necessary.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

Models:
(03 - 04 Cadillac Escalade C1, C6, K1, K6) and (03 - 04 Chevrolet Avalanche C1, K1, C2, K2) and (03 - 04 Chevrolet Silverado Truck C1, K1, C2, K2, C3, K3 ) and (03 - 04 Chevrolet Tahoe C1, K1 ) and (03 - 04 Chevrolet Suburban C1, K1, C2, K2, C3, K3 ) and (03 - 04 GMC Sierra Truck C1, K1, C2, K2, C3, K3 ) and (03 - 04 GMC Yukon C1, K1 ) and (03 - 04 GMC Yukon XL C1, K1, C2, K2, C3, K3) and (03 - 04 Hummer H2 N2 ) and (03 - 04 Buick Rainier S1, T1 ) and (03 - 04 Chevrolet Trail Blazer EXT S1, T1 ) and (03 - 04 GMC Envoy XL XUV S1, T1)

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
© Copyright General Motors Corporation. All Rights Reserved.
Document ID# 1541463
2004 GMC Truck GMC C Sierra - 2WD

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twoguns? said:

"Found this hope it helps"
Impressive

.
(note to the pet peevers, i did Not repeet the hole post)
Different kind of vehicle, but I have a friend that his dome light would Not go out, he had to take the bulb out.
couple months ,the battery went out . tech that put battery in noticed the missing bulb and replaced it.
Friend say that it had always stayed on, tech said , yea ...thats how you know the battery is failing...
there Are some Good Tech's out there...

.Oh were in the nearly poverty club, so it wasnt a big time dealer

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