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Chevy Silverado and GMC Sierra Duramax Diesel Questions



  • billmaebillmae Posts: 2
    Hello I'm checking to see if anybody has the same problem i have a silverado 2500 with a 6.6 duramax about 3 weeks ago when the motor was cold the overflow dumped antifreez after that i could not get the temp to stay warm cold air coming out of the heater and defrost when it did warm the low coolant light comes on i put in new thermastats same problem and i have air coming up in the overflow this truck has only 76,000 miles on a deisel egn and im hearing it might be head gaskets if any one has had a problem like this i would realy like to hear from you
  • i have a 2007 k2500ext/crew car 6.6 durmax wallison trans w 25k miles. when pulling my fifth wheel 9500 # up hill @ about 2500 rpms it starts to make sound like a skill saw cutting sheet metal. all gauages and perfomance nomal. its so loud that when i go buy someone they take a second look. ive had it to the dealer 3 times w/no conculsion. is this somthing in the turbo? should i hear the turbo at any time?this is getting to be a great concern. or is there something else i should be concered with?
  • I have a 2007 3500 crew cab and pull a fifth wheel that weighs just over 13,000 lbs. Next time you hear this look at the engine temp if it is just past 210 then it's the clutch fan kicking in not the turbo, mine it so load you can't hear the radio. I'm betting that's what it is.
  • slyjoeslyjoe Posts: 4
    Is this done on a case by case basis or available to all under 200k? Thanks..
  • slyjoeslyjoe Posts: 4
    Is this done on a case by case basis or available? Thanks..
  • slyjoeslyjoe Posts: 4
    I've owned this truck since new and it has just under 60k miles now. I am on my third set of batteries. Does that seem excessive? I live in Las Vegas where the weather is often over 100 degrees. I haven't replaced them in over a year and haven't had any problems. Just yesterday a problem arose. The clock on the radio goes to 12:00 as if the truck has/had a dead battery. All the presets are still there, but ther clock reverts back to 12:00. The truck turns over, although a bit sluggish. Anyone have/had the same or similar problem? Thanks..Jarrett
  • I have a 2007 gmc duramax, the problem i,m having is the dash lights dont all work. the dealer replaced the radio because some of those lights went out at about 34000k miles. since then i have had more problems with other lights, like only part of the speedometer lights up, only half of the climate control lights work. now i have some interference in the front speakers. when the seat belt reminder chimes i can hear it in the front speakers. please any help would be great. aj
  • I just bought a travel trailer(5500 lbs dry weight- 7000 all in?)and need a long term vehicle to tow it. I've test driven the above vehicle and find it has LOTS of power. The question is...fuel economy. How can I get the best fuel economy with this truck? After market chip? Do I need the 6.6 or will the 6.0 litre be sufficient. Which of the 2 would you pick? Any specific problems with either one? The blog entries really don't describe any with the 08 models. Also, I am Canadian. Do you suggest I buy State side and pay the dollar difference? The only taxes I have to pay is the standard 7%pst + 5%gst. Just trying to be wise in my decision over the long run. thxs
  • well my 01 6.6 duramax with only 75000 mi had to have head gaskets put on at $4,700 i talked to the dealer ship and told them that i heard about the the problem with the gaskets on that and made like this is the first time they ever heard of it i got this truck when my son inlaw past away it was his baby the dealer ship also said if i was the first owner they might cover part of the cost anyone else as happy with G.M as me.
  • have gmc 2003 sierra 3500, 148088 miles. runs great, starts great, have recently noticed excessive smoke from exhaust only when ideling. will cleaning injectors solve this?
  • My 2004 GMC Duramax (60,000 mi) will have a complete system (electrical, drivetrain) shutdown without notice; unfortunately it only occurs while driving. As you would expect things can get pretty exciting with no power steering or brakes. I have on occasion been able to shift to neutral and restart but not always. This shutdown only happens once every few months but could be very dangerous regardless. When this recently occurred I noticed the "warning" indicated "battery not charging." The batteries are fairly new and they tested good. The dealer ran the diagnostics and couldn't find anything wrong; said that they would need to have the "event" occur while they're testing. They charged the batteries and kicked me out the door with a defective vehicle and I don't know what to do next. Any help would be appreciated.
  • 3jp3jp Posts: 3
    I put about 18 gal, of gas in my sierra and ran it for about 60 miles. engine idled bad. had it towed to a chevy dealer where the tank was siphoned out, lines blown out, fuel filter changed out. truck runs ok, but i feel it does not have the power it used to have. what could i have damaged? and do you think the chevy dealer put my truck in a gm database that if i try to take my truck to get checked to a different gm service center in a different state, it will show up and void my warranty? i paid cash but the invoice had vin # on it. any help will be appreciated.
  • things.
    1. Ignition switch-what all are you hanging on the key ring?
    2. Intermitten ground fault
  • Damaged your fuel injector. Pitted from the gas.
  • If the fuel lines were collapsed, there is a restriction causing a vacuum.
  • Thanks for the response Jack.
    -I only have the key in the ignition and nothing else.
    -Intermittent ground fault; could be of course; the word "intermittent" is a nightmare for all concerned.
    Because the truck has only shutdown during city driving I wonder if the alternator could be the intermittent problem. I'm not familiar with the inner workings of the alternator but could it be that it "intermittently" doesn't charge the system enough to keep it running? My understanding is that if it's not putting out at least 10 volts then the electrical system will shutdown. What sucks is that I've had the local dealer document that this has been an ongoing issue since new (only happens once or twice a year) but the warranty has just expired and I don't think give a doo-daa anymore. Our temps here can get to -30F and I would hate to be stranded out of town.
  • My 2005 GMC Sierra diesel had the same problem last saturday I took it to the local dealer today and they called me 8 hours later and told me it was the wiring harness to the injectors. total cost w/ parts and labor will be $565.00
  • eliaselias Posts: 2,120
    I recommend to consider a detailed inspection/disconnect/file-posts/impedance/continuity-test of the wire that goes from ground post of battery to the ground post of starter motor.
  • ????? Do you understand how the electrical system even works? The body, frame, engine block.... all are a ground source, there isn't a wire running to everything for the ground.

    Anyway the problem isn't with the starter it sounds like the starter turns the engine over but since the thing shut down it won't start. It still could be a bad ground with some component because everything electrical has to have a connect to a ground source. This is usually done by one or more of the mounting screws and/or bolts.

    I'm not saying it's not a bad ground just that there isn't any wiring to check out for the ground.
  • eliaselias Posts: 2,120
    i'm definitely not familiar with the specifics of these trucks - i'm just a wannabee owner, so thanks for the beat-down!
    I thought that most vehicles have that particular wire, and that it/posts can get corroded and cause an unintended voltage drop.
    Maybe my recollection is way off even for my particular GM V8 which had a problem with that wire: I suppose it could have been the hot wire from battery and not a ground wire.
    (I do recall being particularly careful when using a jumper cable
    to parallel that wire, as required sometimes for that car - it looked a bit like I was "hotwiring"/stealing.)
  • 3jp3jp Posts: 3
    I have taken it in fto the dealer and asked them to check the injectors and pump and they have not found anything wrong. I have not told them that i put gas for fear of voiding my warranty. will a pitted fuel injector pump come up on the diagnostic test? Is there a way to check it? How can I approach the dealer to check for this?
  • onyx2onyx2 Posts: 3
    i have an 04 chevy 2500hd 6.6 that surges at idle. if i let the truck idle it jumps from 1000 to about 1500 every 4 to 5 secs. it only happens sometimes so it's kind of hard for me to pin point the cause of it. plus my engine light likes to come on an won't let me go over 2500 rpms. the code says something like (pressure regulator failure at acceleration). i know someone has to have same problem out there. if anyone can help with this please help.
  • jmoore11jmoore11 Posts: 1
    Just had oil change on 2001 GMC Duramax, and they discovered diesel in oil pan. Took to shop and they stated that all 8 injectors needed to be replaced. This was my fathers truck and do not know if there were any extended warranties on the vehicle at time. The truck only has a little over 130,000 miles. Does anyone know if there are any recalls on the injectors since I have heard so much on these going bad? It is going to cost around $5000.00 to get all replaced with labor and new injectors. Also, would replacing with refurbished injectors be a wise decision due to the cost of new ones.
  • I own an 04 LLY Dmax and went to the dealer for servicing and was told that 2 injectors are sent too much fuel. I was told that the work could be as high as $8,000 (C$) which I found outrageous. I researched and found that GM had injector problems with the LB7 engine and problems was suppose to be fixed with the LLY but some had their injectors replaced. GM extended the injector warranty to 200,000 miles on LB7. Does anyone know if this warranty was extended to the LLY? I also read that injector overheat on the LLY? Does anyone know anything about this?
  • folbfolb Posts: 54
    What's the truck doing? Going into limp mode where it won't go past 2000 RPM? Jeff 2005 Duramax Email me direct if you want
  • folbfolb Posts: 54
    Don't ever see them using new. Normally refurbished. The price is outrageous.
  • I did not notice anything with the truck, that is loss of power or decrease in fuel consumption. What exactly should I be looking for? I went for a drive with the truck and noticed that it felt as if the truck was lacking power or did not want to go. It did go over 2000 rpm unless I floored the pedal. Not sure what else to look for.
  • i have a 2001 gmc 2500 and it is hard to start when it the outside temp is cold or when the engine is hot. we have given it a snort of ether when cold to get it to start quicker. other wise its just turns till it starts. Also when the engine gets hot after about an hour the power cuts out at 1800rpm's. so far we have changed the primer pump and we have checked all fuel lines and changed one of them. is there anyone out there who may have some ideas for us?.
  • folbfolb Posts: 54
    I have an 05. Don't know if the setup is the same. Check the back side of the driver side fuel rail. There is a "pressure valve?" on mine that gets weak and you can buy a shim kit or a new one from PPE out of California. Pacific Perf. Eng. Stays about 1800 RPM and won't go any faster right? Can you turn the truck off for a bit then back on and its OK? Can't get it to happen just by revving the engine but under load? Try that valve. Jeff
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