20 Most Recent 2011 GMC Sierra 2500HD Questions & Answers


the module is located under the center console , CAUTION WHEN WORKING ON AIR BAG SYSTEM, A CERTIFIED TECH SHOULD BE THE ONLY ONE TO WORK ON SYSTEM. this will avoid false deployment or failure of system in a crash.

2011 GMC Sierra... | Answered on Feb 12, 2019


The module for almost any car is situated in the centre of the car, around the gear lever area.

2011 GMC Sierra... | Answered on Nov 03, 2017


I thought they had quit using the module in back, Maybe not. It is located behind the passenger side rear tire, mounted to the body. Usually grey in color, has four plugs going to it. I have replaced tons of these. Get some battery terminal cleaner and brake clean, most likely your going to have to clean out the plugs. Corrossion

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2011 GMC Sierra... | Answered on Jun 25, 2016


Sorry we do not do that . call your dealer .

2011 GMC Sierra... | Answered on Mar 23, 2016


The only problem using 4x4 on dry pavement that may develop is with the front differential/axles. It will have no adverse affect on fuel mileage when the 4x4 is disengaged. Fuel economy will be affected if running in 4x4

2011 GMC Sierra... | Answered on Jan 28, 2016


Abs light on normally its one of the wheel bearing in the front abs sensor are in the bearing you got to pass a scanner on the truck to find wish one is difective

2011 GMC Sierra... | Answered on Apr 04, 2015


602 is a microprocessor and/or a programming issue with the PCM. 700 is a generic code for a transmission problem. This one could be caused by the 602 code. Basically to fix this, you have to have the PCM reprogrammed first, then if the code comes up again, the PCM has to be replaced and programmed to your truck. Then if you still have a transmission code, it will have to be addressed. Shop shops can do this work. Much cheaper than a dealer.

2011 GMC Sierra... | Answered on Mar 01, 2015


Behind glove box or under front cowl-front of windshield w wiper motor area

2011 GMC Sierra... | Answered on Sep 01, 2014


the green wire is the right signal wire,the brown wire is for the park lights,the yellow wire is for the left signal

2011 GMC Sierra... | Answered on Dec 02, 2011


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

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