pretty bad
Typical Repair Cost:
Average Mileage:
100,000 miles
Total Complaints:
5 complaints

Most Common Solutions:

  1. repair engine (3 reports)
  2. replace egr valve (1 reports)
  3. replace the whole fuel system (1 reports)
2011 GMC Sierra 2500 fuel system problems

fuel system problem

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2011 GMC Sierra 2500 Owner Comments

problem #5

Jun 032021

Sierra 2500 SLE 6.6L Duranax

  • Automatic transmission
  • 110,000 miles


Bosch CP4 high pressure pump destroyed my whole fuel system. All of the fuel lines, injectors, fuel rail and pump had to be replaced. I went with a CP3 conversion kit so this doesn’t happen again. Bosch needs to do something about these pumps. I got off lucky with paying $8000. A lot of mechanics were telling me $10000. We are a single income family and can’t afford to have catastrophic failures like this.

- Jeremy H., Lawton, US

problem #4

Mar 172019

Sierra 2500 HD 6.6L

  • Automatic transmission
  • 125,600 miles

The weak injector pump was a real problem that would not have occurred if gm had not went to the lesser pump which was the source of the problem. It is ridiculous to have this problem since they have went back to the old style pump. It tells me that they knew about the problem and tried to cover it up!

- Michael M., Star, US

problem #3

Oct 232018

Sierra 2500 SLE 6.6L Duramax

  • Automatic transmission
  • 95,534 miles

My 2011 GMC Sierra 2500 Duramax diesel story...

On October 23, 2018, my Duramax diesel decided that our loyalty had ended. This vehicle broke down roadside with a crank no start issue. The vehicle was towed to a local dealership in Churchville, NY where it sat outside for a week. I called to inquire about the vehicle at which time the vehicle was brought into the dealership for diagnosis. At week 2 of this 12 week nightmare, The dealership informed me that the diesel pump along with the two batteries needed replacing. On week three, the dealership said their mechanic was into it and the good news was ( no metal filings where found ). On week four, I received a voicemail stating, the vehicle had a bit of starting, their exact words, and that they had to get a special tool to do more testing. There were absolutely no updates during weeks five, six, or seven. At the end of week seven I drove to the dealership to question their customer service policies. At this time I spoke with one of their representatives named Tim Barnard who stated ( GM factory techs were involved, that I would be responsible for the initial repair and everything that GM instructed them to do at this point was covered under warranty ). On week eight, another dealership representative said the GM suggests they replace all the injectors, he then stated that the cost would be four thousand dollars at my expense. I asked what the vehicle was doing and they said that they could get it started by spraying something in the engine but they couldn't tell me what they were using. They said that the vehicle would start, but that it wouldn't remain running. I then contacted GM customer service who could not determine any open case file for this vehicle. On week 9, I was contacted by Chris from GM customer service. Chris stated that the dealership was covering the cost of the initial repair and that I would be responsible for the rest. I told Chris that the dealership had stated otherwise. Chris then informed me that he could not make sense of his notes and had to contact the dealership and that he would get back to me. On week 10, the dealership informed me that they had dropped the fuel tank to check for clogged lines and found metal filings in the fuel. When asked where the metal filings came from, I was told from the return lines on the fuel system. I asked again where the metal filings came from, and they stated that the original pump that they had replaced was full on metal filings. I referred them back to week 3, when I was told that there were no metal filings found to which they did not have an answer. At this time, Chris at GM customer service left a voice mail stating that I would be responsible for the entire repair at a cost of nearly $10,000! On week 11, I instructed the dealership to push the vehicle outside so that I could have it towed home. The dealership told me that they would put the fuel tank in to back of the truck because it had to be cleaned out anyway and that an indirect fuel injector, supplied under warranty would not be installed to prevent damage from metal filings. They said they would put this part in the cab with the other parts. On week 12, I went to the dealership to pay the $4400 in repairs that had already occurred. I was approached by Tim Barnard... remember Tim Barnard?? He stated that at no time did he promise any monetary compensation. I informed him of his conversation and exactly what he had stated at which time he again denied his previous statements. At this time, I reminded him of my witness who was sitting there while he had made his statements. Mr. Barnard continued to deny what he had previously said and I had to order him twice to go do his job. At that time, he left. The keys for my vehicle had to be sought after so that I could leave the dealership. My vehicle was towed home later that same day where it continues to be a $30,000 lawn ornament. I am so happy with my experience that I sold my wife's 2016 that was sitting in my driveway and replaced both vehicles with Toyota vehicles, my new go-to car company.

- brianleo, Byron, US

problem #2

Nov 042016

Sierra 2500 SLE 6.6L Diesel

  • Automatic transmission
  • 78,840 miles

p140a code egr bypass sensor fault

Had fuel pressure issue which shut off truck. Ended up with new fuel pump, fuel lines and injectors all under warranty. When i took it to the dealer it also had the P140A code for EGR cooler bypass position sensor. Told dealer to fix it while they had the motor apart. Dealer does not fix the issue and check egine light is back on. Dealer says that the issue is not warrantied and since repair manuals show 6 hour to repair i have delayed in getting the repair. After some research on-line i found several websites that say the issue is covered by GM warranty for 10 years 120,000 miles. The dealer says that the warranty program is listed for 3500's and other 2500's but not listed for my vin #. Contacting GM customer service and see what they say. So much for Duramax being great motor.

- Chris M., Hackettstown, NJ, US

problem #1

Apr 172016

Sierra 2500 Diesel

  • Automatic transmission
  • 90,000 miles

We bought a new 2011 GMC 2500 Diesel truck and have had numerous problems with the engine. It breaks down and limits the engine to 5mph. two weeks after we got the truck, we were driving 80 mph on expressway with traffic when this happened. Thankfully no one as hurt when the engine was reduced to 5 mph! This past March after we had just paid ff the last payment, we were on vacation 1200 miles from home when the truck's engine was once again reduced to 5 mph. After the truck was towed to the nearest GMC dealer, we were told that a high pressure fuel pump had failed and metal was shot throughout the whole engine. Worst part- the truck was 6 days - yes 6 days- over the warranty and GMC and the dealership told us that the repair bill was approxiamently $12,400.00!!! Over $8000 in parts alone! After fighting with GMC, they agreed to pay half. Big deal! My husband and I are a mechanic and teacher by trade so $6200.00 spent on a truck that is 5 years and 6 days old is ridiculous! GMC dealership wouldn't work with us and give us anything to trade on a new truck- plus we really didn't want a truck payment! It is sickening! Our vacation was ruined. It cost us about $1000.00 more because the truck was not done when promised so we had to prolong our vacation. I missed a day of work- it is a nightmare. Now we are home and the truck is loud, vibrates and needs further servicing and the warranty work must be done at a dealership 1200 miles from home! We have driven GMCs our entire adult life. We actually contemplated buying a Ford because we have a relative who retired from Ford so we could get a Z-plan discount but we are loyal to GMC and my husband wanted the GMC- what a mistake we made! We have called GMC numerous times and left messages with the customer assistance representative that we spoke with when we were talking to GMC about covering this truck under the warranty. He has yet to call us back nor speak to us when we call. Never again will we, or my extended family, buy a GMC. When you pay over $48,000.00 for a truck, you expect it to last more than 5 years. When there are major problems consistently with the engine and the fuel system on the duramax you expect to be taken care of. We got a lemon. GMC commercials and their promise of commitment and loyalty to GMC customers is a joke!

- Cari D., Allegany, NY, US

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