One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.
Resources for the Repair and Maintenance of your GMC Sierra 2500
GMC Sierra 2500 Models:
GMC Sierra 2500 Problems
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator
Heating & Air Conditioning --
Verified
Clicking Noise From Flasher When Turn Signals are Off
Electrical & Lights --
Verified
A clicking noise may be noted from the turn signal flasher after the turn signals are switched off. This is commonly cause by a faulty turn signal switch which will require replacement.
Stalling or Low Engine Idle Speed Due to Dirty Throttle Body
Engine --
Verified
A dirty throttle body may cause a lower than normal idle and possible stalling condition. Performing a throttle body service will commonly correct this concern.
Check Engine Light Due to Gas Cap Issue
Exhaust & Emissions --
Verified
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Service 4WD Message May be Displayed
Drive Train --
Verified
The 4WD transfer case position sensor or the selector switch may fail causing the service 4WD message to be displayed.
GMC Sierra 2500 Recalls (Recent)
Rear Seat Belt for Smaller Passengers May Not Fit Correctly
Body, Interior & Misc., July 21, 2005
RepairPal Expert Overview:
The second row center seat belt routing may make it difficult to position correctly on smaller passengers. If the seat belt rides up to fit around the abdomen, the risk of internal injury is increased in a crash. Dealers will cut the guide loop, remove a portion of the loop, and the remaining sides should be folded over and secured with a retainer. The recall began July 21, 2005. The GM recall number is 05037.
GMC Sierra 2500 Recall 04V129000
Body, Interior & Misc., September 18, 2004
Summary: ON CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES, THE GALVANIZED STEEL TAILGATE SUPPORT CABLES THAT RETAIN THE TAILGATE IN THE FULL OPEN (HORIZONTAL) POSITION MAY CORRODE, WEAKEN, AND EVENTUALLY FRACTURE. IF BOTH CABLES FRACTURED, THE TAILGATE WOULD SUDDENLY DROP AND STRIKE THE TOP SURFACE OF THE REAR BUMPER.
Learn more »Hydro-Boost Relief Valve May Not Function Properly
Brakes, June 18, 2004
RepairPal Expert Overview:
The hydro-boost housing relief valve bore may be out of specification. The seal may fracture as a result, which may reduce braking assist and slightly increase the steering effort while braking. Under certain conditions, more braking effort will be required to stop the vehicle. Dealers will replace the hydro-boost relief valve. The recall began June 18, 2004. The GM recall number is 04004.
GMC Sierra 2500 Recall 05V379000
Brakes, September 22, 2005
Summary: CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES MAY EXPERIENCE UNWANTED ANTILOCK BRAKE SYSTEM (ABS) ACTIVATION. THIS CONDITION IS MORE LIKELY TO OCCUR IN ENVIRONMENTALLY CORROSIVE AREAS. THIS RECALL WILL BE LAUNCHED IN THE "SALT BELT" STATES OF CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, MARYLAND, MASSACHUSETTS, MAINE, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WEST VIRGINIA, WISCONSIN AND THE DISTRICT OF COLUMBIA ONLY.
Learn more »Fuel May Leak from Fuel Rail
Engine, August 31, 2006
RepairPal Expert Overview:
The retainer clip for the fuel rail pulse damper may fracture and allow the damper to come loose from the fuel rail. A fuel leak in the presence of an ignition source may result in a fire. Dealers will replace the engine fuel rail pulse damper free of charge. The recall began August 31, 2006. The GM recall number is 06080.
GMC Sierra 2500 Questions and Answers
Visitor, 1999 GMC Sierra 2500, Mill Run, PA
I have 1990 GMC sierra 2500. i need to find out if it has abs brakes for axle replacement.
leer123, 1999 GMC Sierra 2500, Gasoline, White Salmon, WA
replaced fuel pump and fuel filter truck still no start, thanks for any advise !
genopower, 1999 GMC Sierra 2500, Pittsfield, MA
I replaced all the brake lines with Cunifer then bled them at the wheels. The one that goes from the control box (under cab) to rear wheels is leaking. It is screwed in fully and tight but when pre...
mydamntruck, 1999 GMC Sierra 2500, Tupelo, MS
how can you check to see if the transfer case for my 4x4 needs fluid
mydamntruck, 1999 GMC Sierra 2500, Tupelo, MS
my transfer case was not going into gears right with my 4x4 gm sierra 2500 1999 model. i refilled it with the transfer oil. but i am hearing a whistle noise, it is shifting now and not jumping like...
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GMC Sierra 2500 Reviews
bought my GMC 2500 in 2004 new, has 135,000 miles on it, when making turns there is a knocking noise in the steering shaft nobody has ever been able to fix it, interior on drive side had to be replaced, ac blow hot air , have to cut truck off
and restart to get cool air, sometimes it works sometimes it does't, there is a noise that sound like the drive shaft is hitting something, replaced front hubs at 100,000 miles, coatings on rims are peeling off,
sticker price 45,000
can't wait to buy another one and pay 800.00 dollars a month
My sierra was a terrific truck until it spontaniously caught fire while the truck was off and parked in my drivway. If your blower motor stops or electrical things start becoming irratic gages...ect. Keep your truck out of your garage and get it checked. a.s.a.p.
Great truck over all, however mine's AC just stopped working out of the blue one day and even though all the fuses and relays are good the unit is still not getting any power
good ,reliable vehicle
brakes fail, company dont care, and dealers 2 different ones cant find problem or are just to lazy to give a shit
GMC Sierra 2500 Model Years
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