2005 GMC Sierra 2500 Problems

What owners report

Owners of this model year most often describe braking problems: brake lines that rust through and let the pedal go to the floor, plus slow-stop ABS behavior that makes the pedal feel soft or increases stopping distance. Instrument cluster faults, mainly a speedometer that sticks or reads far above actual speed, are the second most common theme, and several owners say the dealer or the manufacturer declined coverage. Many of these complaints are filed at low to moderate mileage, and some owner reports link the brake-line and underbody rust to winter road salt.

1. 1
   Electrical system

   Speedometer sticks or reads wrong

   • 31 complaints (27%)
   • median 66,827 mi at 5.0 yrs old (26 state mileage)
   • owner-quoted repair $500 (median of 5 quotes)
   • filed 2007–2016

   Owners describe the speedometer needle sticking, jumping, reading far higher than actual speed, or resting above zero when stopped, sometimes pinned past the top of the scale. Complaints say the fix is instrument cluster replacement or repair, with quoted costs around several hundred dollars, and several owners state their vehicle was not covered by a related instrument panel campaign. A few mention the fuel gauge or gear indicator reading incorrectly as well. Typically reported from roughly 35,000 to 100,000 miles, often appearing gradually before the needle fails outright.

   1 related service bulletin

   What to check: With the truck stopped, confirm the speedometer needle rests at zero, then compare the reading against a GPS at road speed. Ask whether the cluster has been repaired or replaced, and keep records if it has.

   2 excerpts from owner complaints in NHTSA records

   “I own a 2005 Gmc sierra 2500hd pickup. The speedometer on this vehicle is starting to go bad and when I am driving down the highway it will gradually loose indicated speed and then eventually go to zero. I am aware that there is currently a recall out for this type of problem, but I had my vehicle in the shop and for some reason my VIN # does not fall into the recall list so I have not got it repaired at this time. …”

   NHTSA complaint #10310404, filed 2010-02, 40,250 miles

   “While pulling a 30 ft. Camper at approximately 50 MPH the speedometer suddenly went past 120 MPH and stayed . I now have no way of determining my speed . The local dealer said I would have to bring it in and leave it at least 3 days .”

   NHTSA complaint #10593858, filed 2014-05, 114,000 miles
2. 2
   Brakes

   Rust-through brake lines, pedal to the floor

   • 19 complaints (17%)
   • median 56,098 mi at 8.8 yrs old (18 state mileage)
   • 1 mention a crash, fire or injury
   • owner-quoted repair $1,300 (median of 5 quotes)
   • filed 2011–2023

   Complaints describe the brake pedal going to the floor with little or no warning while stopping or pulling out of park, with brake fluid found leaking from rusted steel lines under the driver's side. Several owners say a shop or dealer recommended replacing all of the lines once one had failed, and some report the repair running into four figures. A few mention the truck was being used to tow when the loss of braking happened. Mostly reported between roughly 20,000 and 95,000 miles, often on trucks driven in road-salt areas.

   What to check: Have the steel brake lines inspected along the frame under the driver's side and above the rear axle for rust and seepage, and ask whether any lines have already been replaced. Check the fluid level and look for wet spots at the lines.

   2 excerpts from owner complaints in NHTSA records

   “Depressed brake pedal to stop truck and pedal went straight to the floor. Front brake lines had ruptured due to corrosion. This truck is my main tow vehicle and I had a small trailer on when this occurred. My truck has not seen much winter use since new and I am the owner since new.”

   NHTSA complaint #10476785, filed 2012-09, 58,196 miles

   “Major rust of the undercarriage of my 2005 Gmc sierra 78,000 miles. So far had to replace brake rotors, brake lines , fuel radiator and lines. Frame and cross members as well as control arms are all rusted. Made complaint with Gmc they had me bring to a dealer to tell me this is normal rusting. Two of my relatives have the same year truck but are not experiencing this issue and we all live in the same area drive same roads.”

   NHTSA complaint #10416571, filed 2011-08, 78,000 miles
3. 3
   Brakes

   Soft or long brake pedal on slow stops (ABS)

   • 14 complaints (12%)
   • median 39,195 mi at 4.5 yrs old (14 state mileage)
   • 1 mention a crash, fire or injury
   • filed 2006–2012

   Complaints describe the pedal sinking or dropping out just before the truck comes to a stop, extra pedal effort, and longer stopping distance, with some owners saying the ABS engaged when it should not have. Some report that removing the ABS fuse stopped the symptom and reinstalling it brought it back, and a few say a dealer found the brakes operating normally. Others tie the behavior to corrosion at the ABS sensors in road-salt states. Most often reported between about 25,000 and 60,000 miles, on slow-speed stops and in wet or salted-road conditions.

   What to check: Test several slow, light-pedal stops from about 10 mph and feel for the pedal dropping or the ABS cycling. Ask whether the ABS sensors or wheel hubs have been serviced and whether the brake fluid has been changed.

   2 excerpts from owner complaints in NHTSA records

   “I own a 2005 Gmc sierra 2500hd. I am having the same ABS problems in campaign # 05v379000. As I come to a stop the ABS system kicks in and increases my stopping distance.”

   NHTSA complaint #10274439, filed 2009-06, 25,000 miles

   “For almost a year now the brakes drop out or essentially quit slowing the truck below 10 MPH. Extra effort is required to stop. This has caused numerous near miss rear end collisions. When towing an 8000 pound trailer this is a significant safety hazard. I removed the ABS brake fuse on the advice of a tech and the problem stopped immediately. With the fuse reinstalled the problem returns.”

   NHTSA complaint #10318220, filed 2010-03, 29,500 miles
4. 4
   Engine

   Broken exhaust manifold bolts and exhaust leak

   • 9 complaints (8%)
   • median 85,000 mi at 7.1 yrs old (7 state mileage, few)
   • filed 2010–2023

   Owners report exhaust manifold bolts breaking off in the cylinder head on one or both sides, leading to a ticking or leaking exhaust under the hood, an illuminated check engine light, and concern about fumes entering the cabin. Complaints describe quotes for extracting the broken bolts and replacing gaskets and manifolds, and some owners say the manufacturer did not treat it as a known pattern. Reported from roughly 35,000 to 95,000 miles on gas V8 trucks, with no clear seasonal pattern in the complaints.

   What to check: Listen for a ticking exhaust note at cold start and look for soot streaks or broken bolt heads where the manifold meets the head. Ask whether manifold bolts or gaskets have been replaced.

   2 excerpts from owner complaints in NHTSA records

   “Exhaust manifold bolts are breaking off for no apparent reason. I have four broken already and an exhaust leak developing. This appears to be a defect in manufacturing. I have a friend with two of the same trucks that the same thing has happened to. There are numerous complaints posted on the web. I have had many vehicles over the years and worked them hard but have never seen a broken exhaust manifold bolt on any of them. This can be a dangerous situation as having exhaust leaks under hood could cause a fire. …”

   NHTSA complaint #10482144, filed 2012-10, 35,000 miles

   “2005 Gmc 2500hd with 6.0 liter gas motor. Left and right bank exhaust manifold to engine bolts broken off in head. Leaking exhaust fumes and causing my check engine light to come on. Gm need to have a recall on this due to the number of vehicles out there with this problem. This is also an emission problem due to it will cause the cat converter to overheat.. Epa? Thank you”

   NHTSA complaint #10536241, filed 2013-08, 85,123 miles
5. 5
   Engine cooling

   Overheating while towing or on grades

   • 5 complaints (4%)
   • median 35,000 mi at 1.8 yrs old (5 state mileage, few)
   • filed 2005–2013

   Complaints describe engine temperature climbing toward overheating when towing a heavy trailer up a long grade in hot weather, in some cases to the point of the truck shutting down or the owner having to pull over. Owners of the diesel version report the same pattern, and a few complaints attribute overheating to head gasket problems. Some say dealers were unable to resolve it. Mostly reported under about 50,000 miles, typically while towing on grades in hot ambient temperatures.

   4 related service bulletins

   What to check: Check coolant level and condition, look for residue around the radiator, hoses and head gasket area, and ask whether the cooling system has been serviced. If you plan to tow, test the truck on a long climb before buying.

   2 excerpts from owner complaints in NHTSA records

   “When climbing a significant grade , 6%, while towing 12.500# 5th wheel on a day with high ambient temperature , 95% engine temperature, immediately began to climb and reached almost overheat when I fortunately found a place to pull off the road. Incident took place on the grapevine in ca. If I hadn't been able to pull over I would have been stuck in traffic lane with 18 wheelers right behind me. 2 dealers were unable to help.”

   NHTSA complaint #10187387, filed 2007-04, 12,000 miles

   “While traveling west of denver, colorado my 2005 Gmc sierra 2500hd equipped with the duramax diesel overheated to the point of the vehicle shutting down. This happened on a stretch of highway where there was no shoulder to pull off on resulting in an extremely hazardous condition. I have done extensive on-line research and have found this to be a common occurrence with the 2004.5 and 2005 model year chevrolet and Gmc hd series trucks equipped with the diesel motor. …”

   NHTSA complaint #10137610, filed 2005-09, 9,900 miles

Buying note. Prioritize a truck whose brake lines have been inspected or replaced and whose instrument cluster works correctly, since those two themes dominate owner complaints. A pre-purchase inspection on a lift, with attention to brake lines and underbody rust, is worthwhile given the age of these trucks.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.