Question about 2003 GMC Sierra C/K3500

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GMC Sierra 3500, 6.6L Duramax Diesel blowing fuel injectors!

I have a GMC Sierra 3500, 6.6L Duramax Diesel engine, that had fuel injector replacement at 34,167 miles. Code J7801 replacement fuel injectors. Today the truck has 41,000 miles and #2 injector failed with fuel coming out wherever it can...exhaust pipe etc. Are these truck continuing to have the same problem even after repair? I have had numerous problems with this truck. It also had the transmission replaced at 2,000 miles and the steering assembly has also been replaced and then repaired. I think this is a GMC Lemon!!

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Papa Chan
  • 56 Answers

SOURCE: 2003 GMC Duramax Diesel won't start

I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.

Posted on Jan 05, 2009

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moparownr
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SOURCE: engine won't idle,

ok code 32 is the EGR (exhaust gas recirculation) this does not mean that the EGR valve is bad right off, check it and see if it is stuck in the open position, remove the vacuum line see if it moves, it should not. It is supposed to open at highway speed to recirculate exhaust gases and burn them, if the valve is stuck open the engine will not idle because it upsets the air mixture too much, if you remove the valve and see its open, then replace it.

Posted on Apr 07, 2009

  • 1 Answer

SOURCE: 2003 gmc sierra duramax 2500

Problem with Diesel Fuel System. Gmc 2002 duramax 2500 HD 4x4 will start 

Posted on May 15, 2009

michigan man
  • 3533 Answers

SOURCE: thermostat installation 05 g3500

try these website to see if the have your truck listed its www.alldatadiy.com and another one is www.autozone.com i also would like to give you this information if you ever have any hard to find GM-parts its Schram auto & truck parts 1-800-292-1032 and they website is www.schramauto.com and i hope i have been some help to you MIchigan Man.

Posted on May 19, 2009

  • 45 Answers

SOURCE: I bought a 2006 GMC Sierra 3500 Duramax

Hi: the 06 Duramax came with a LBZ, 18 mpg is normal, to improve it ... "chip" it, put in an "AirRaid air filter and a 5 inch exhaust. (cost about $1,000.00) Fuel mileage improved by over 30%.

Posted on May 22, 2009

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We have a 2003 GMC Sierra duramax diesel truck We took it into the shop last week because it would not start. They told us that the fuel filter was sucking air and changed it. The truck then ran fine for...


i have a 2003 , 2500HD Duramax with 223000km . I was way up in the north country when this started to happen to my truck. I found an old mech. who had to come back into the bush to give a boost because i couldn't start my truck as well. He told me he has seen this before on the 03's. Long story short it was the injectors the dealer replaced all 8 under warrenty. GM sent me a letter later saying they will cover all diesel parts under warrenty for 320,000km and another 6yrs. its your injectors change your oil more often until you get it fixed. To check this park your truck for the day and try starting it if it will not start. Go under the hood and prime the fuel filter (pump until it gets hard) then turn the truck over a little and prime the filter again until hard then start the truck. if this works then get the injectors replaced by GM. This worked for my truck hope it helps. Rick

Mar 07, 2009 | 2003 GMC Sierra

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2003 GMC Duramax Diesel won't start


I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.

Jan 05, 2009 | 2003 GMC Sierra

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