20 Most Recent 2004 GMC Sierra 2500HD Questions & Answers


you can try out some guide from here reliable-store
they also provide live chat feature for instant help and it's very useful

2004 GMC Sierra... | Answered on Sep 25, 2019


either your connectors need cleaning or maybe a break in the wiring. Is there on spot where both wires come together if so check there.If there is any plugs, pull them apart and clean them with contact cleaner

2004 GMC Sierra... | Answered on Feb 03, 2015


I'd be looking at the switch first to see if it's not working.

GMC Sierra... | Answered on Jan 26, 2019


The best solution you'll get from books at www.reliable-store.com

These are books containing info on repair, service, troubleshooting, parts info, assembling dissemble, removal, error/fault codes, wiring diagrams and everything on any vehicles cars, atv, trucks. for klifts, boats, excavators etc

GMC Sierra... | Answered on Jun 21, 2018


If you still have a carburetor there is a needle and seat that controls the float and sometimes they stick in one position and will let to much gas into the engine and causing the spark plugs to foul and not fire.

GMC Sierra... | Answered on Feb 11, 2018


tim, I'm not sure if you have rear disc or drum brakes, but this is usually a caliper or brake cylinder (at the wheel) problem. If you have drum brakes, check for any problems like broken springs on the shoes, which would result in parts floating around, and brakes not releasing properly. The same for disc brakes, make sure nothing has become loose (mounting pins for caliper). If you find it is a brake cyl/caliper problem, you will need to rebuild or replace it. Make sure you bleed the brakes for the entire system (you want to flush out the system to prevent further problems), as old brake fluid can become contaminated (brake fluid absorbs water, which corrodes calipers and brake cylinders, leading to failure of those components). Last, make sure it isn't a parking brake that is not releasing. Parking brake cables corrode from exposure to the elements and can bind up, causing the brakes to drag. Use something like WD-40 on the cables to keep them operating correctly.

GMC Sierra... | Answered on Jan 12, 2018


The premium sound system had six plus a subwoofer.

GMC Sierra... | Answered on Dec 22, 2017


you need to have the airbag serviced! Sounds like a short circuit

GMC Sierra... | Answered on Dec 10, 2017


It sounds as though you have either a frayed wire between the brake control circuit and tail/running light circuit of the truck side of the plug, or someone wired the truck side of the plug incorrectly.

Think about it. The parking brake lights come on when the controller is activated. More than likely the tail lights are also.

The tail lights are also going to come on when the headlights are on. This would cause the trailer brakes to be activated IF there is a short in the TRUCK side of the plug itself.

That's where I would personally start investigating, The truck side of the trailer plug.

Hope this helps.

GMC Sierra... | Answered on Oct 05, 2017


Make sure the old filters rubber seal didnt stick to the filter housing when you removed it. While you have the filter off clean up the housing to filter seal. Ut some engine oil on the filter rubber seal befre putting it back on. Costs nothing and just takes a half hour of your time.

GMC Sierra... | Answered on Aug 19, 2017


I need model year and engine size?
How long since a tune-up? Any applicable trouble codes?
I can only help with testing, what testing have you done? Did you use a gage and check proper fuel pressure? Some of the national brand auto stores will check codes for free, if there are any? Do you have drive by wire throttle? Does the speedometer work ok? Sometimes the vss can effect shift points? I'm not telling you to replace anything, but, do some testing. I can't go by what the mechanic did or didn't do. I can't go by what they said.

GMC Sierra... | Answered on Aug 12, 2017


I would.

GMC Sierra... | Answered on Jun 20, 2017


You might look for a loose or corroded ground. Any problems with the horn or wiper wash motor? I assumed a 5.0L engine. Info I see says there is a ground splice point and a couple of common grounds. If those systems are affected, it would be even more likely. Check fuses as well.

GMC Sierra... | Answered on May 17, 2017


Get a manual from an auto parts store for your specific vehicle. It will give you all the information you need .

GMC Sierra... | Answered on Apr 16, 2017

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