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Chevy Silverado and GMC Sierra Transmission Problems



  • First thing that would come to my mind, if its intermittent would be pressure control solenoid. High line pressure would cause it to be loud and hard maybe thunk.
  • filthyanimalfilthyanimal Posts: 2
    edited June 2010
    Hi, I am going to say what a pain.
    I have a 01 1500 4.3 po300 flashing engine light. let me say I have a scanner and consider myself to be somewhat knowledgeable. but I am looking for ideas.
    I have po 300 right bank 2 4 6 misfires engine obviously lacks power. barely runs . I have -35 degrees cam retard. Wont run long or fast enough to do crk learn. I think it is symptom of misfire not cause. I have pulled exhasut off pass side to eliminate the cat. doesnt change it without cat c onected. I got it to run long enough to set o2 code but it was for the heater circuit. I have read that the injectors should have 11-14 ohms resistance if checked at the pins in the upper plenum Anyone heard that. Mine do not have between 5 - 8 ohms. on the 6.. Is it likely all 6 injectors went bad at once. the fuel trim is being cut off on the even bank -25% while odd side is dumping +25%. I want to believe its come down to pcm ,spider,02's, possibly maf but it doesnt change and has comparable readings to my v8 burban. i am open to ideas distributor, but that would explain timing but not dumping of fuel
    fuel pressure is koeo 62psi, and 58 barely running. Thanks
  • cb_cb_ Posts: 1
    My '99 Silverado has suddenly lost reverse. All the drive gears work fine & the tranny fluid is OK so what would cause this? At over 225,000 miles is this the beginning of the end for my tranny?
  • ftosrodftosrod Posts: 1
    I have a 04 Silverado and right after my truck passed 70,000 miles, it began not engaging in reverse. This doesn't happen every time but probably 3-4 times a month. One thing that does happen every time is it shifts really hard when I put it in reverse. It also makes a loud noise, like it's hunkering down. This is very frusting because I bought this truck hoping that I would not have to worry about making expensive repairs! I am thinking I will have to buy a new transmission by the end of the year! Does anyone have any ides what is causing this? I really don't want to trade my truck in if this is a sign to other things that might be coming! Thanks everyone!
  • jimhenryjimhenry Posts: 2
    Chatter when transmission shifts from 1st to 2nd. Coincidence or not but my battery went dead overnight and after new battery was installed this problem arose. I took it to chev garage and they said if the cables were shorted together that the computer would have to relearn my driving habits and it could take up to 300 miles. I have driven 100 miles now and it shifts okay cold but after warm up still chatters. Anyone heard of this before or is this BS advice? He also said it may do this because I have Amzoil in tranny and it is more responsive to friction or something like that. No code lights on and 93000 miles on my 2002 Silverado Z-71.
  • alanwaalanwa Posts: 1
    edited June 2010
    Just happened today. 2003 Silverado HD 6.0L 4sp overdrive transmission with 92,000 miles. Parked it a week ago and had absolutely no issue. Went to drive it 1 week later and the transmission kicks real hard going from 1st to 2nd; kicks very hard going from 2nd to 3rd, kicks hard going from 3rd to 4th. When I started it up, put it into reverse and usual it begins to move on its own; this time it sat until I fed it gas. Is this transmission or rear end? Any suggestions?
  • kelsan1kelsan1 Posts: 34
    Please see my post from a couple of weeks ago regarding the drive line/rear spline grease repack. The dealer told me that it could help from 6000 to 30000 miles but no set guarantee. It has stopped the hard downshift completely for now, it was about $100 to drop the driveline and grease it and replace the driveline back. Hope this helps you.
  • kaykay387kaykay387 Posts: 2
    Don't mean to discourage you, but in case you did not read all the Chevy transmission problems: We bought a 2500HD new in 2002 and the transmission has gone out twice. We do not drive many miles and we do not tow anything except a very small livestock trailer. The only time we use the trailer is to haul maybe one or 2 cows a couple of times a year to our pastures with a round trip of about 6-7 miles. We hire a truck for anything more. When the transmission went out again a couple of months, ago the specialist asked how is it we "trashed" 2 so fast? Then he researched and found this is a re-occurring issue on these transmissions. So much for being loyal GM owners for 45 years!
  • So i have a 2006 GMC 4 wheel drive pickup with auto and today i go to take the kid to a ballgame and while cruising down the highway i went to accelerate and nothing...just like it was spinning in gear (i was in overdrive). Only gears that would work are 3rd, 2nd and 1st. No drive/overdrive... The truck only has 42,000 miles! I stop and i have to go 1, 2 and 3 to move... Warranty is up ...ahhh! Is she toast? Should i send her into the river and tell the insurance company i can't find it :) :) :) ? This is my "whiteknight"...its hard to bag a monster buck when i'm missing a few gears. If i have to, i'll get to my tree stand in reverse!

    Thanks for any help... I'm going to go cry now.
  • I recently purchased a super clean 2002, 5.3, Z71 with 4 speed auto. Truck has Reese hitch with 7 pin connector, so some amount of towing was done. I do sometimes notice a bit of slippage between 1st and 2nd. I talked to some friends at a gas exploration company. These guys buy pickups at the rate of 30-40 every three years. They tell me that the tranny on the 02 is really problematic. My truck has 63K on the odo and dealer service records show a transmission service at 36K. Question: Is there anything I can do to improve dependability of this tranny? ie- flush, fluid and filter change. Anything else? Go to Chevy dealer or independent transmission shop? Any and all input would be appreciated. My last two trucks a 1996 and a 2005 were both Toyota, so I'm green as grass regarding the Chevy. Thanks, Stoney
  • My 2500hd slips in and out of gear at low speeds. Thought it was the VSS so I replaced. Still doing the same thing. ABS light is on while brakes have checked out ok. Repair shop believes it is the Transfer Case causing the problem. I was told by someone that it could be another sensor. The transfer case is not grinding or low on fluid. The computer did not show an error for the slipping. Any ideas?
  • gmcustsvcgmcustsvc Posts: 4,251
    Hello Warmwxrules,
    I apologize that you are experiencing an issue with your vehicle. Can you please email me more information about your situation so I can look into it further? You can get my email by clicking on my name. Thank you,
    Mariah GM Customer Service
  • The transmission in my 90 Sierra started dropping out of overdrive and down into 3rd or 4th gear. The tranny will drop into overdrive like normal but after a short distance, it will drop out and not return to overdrive. Driving like this causes the 'check engine' light to come on because the engine is revving higher to keep up with traffic. This problem cropped up when my alternator dropped out and I had to keep driving as I was about thirty miles from home. The tranny was working fine before the alternator acted up but during the time I was driving home with the bad alternator, the tranny started shifting funny. Any ideas for the repair and is this an expensive repair?
  • I have 04 1500 silverado 4 x 4. the truck is in mint condition, sitting in the garage for the past yr, 110,000 miles. It will switch to unknown driver whenever it pleases..this causes all the guages to shut off...a/c turn to heat, power windows, radio, etc do not work.Hesitates when shifting out of first, rpms/s rev, have to take foot off the gas , eventually it will shift. Started last June, not wanting to shift into overdrive. Took to the dealership, they upgraded the computer, no errors were found. Took to transmission shop, couldn't find anything wrong w/transmission. If i move the drivers seat when unknown driver, it will "re-boot' to the correct driver.
    Just tired of the run around, and want to drive my truck!
    Please help, any ideas?
  • I bought a 05 gmc sierra 4wd recently with 57000 miles on it. When i drive through residential and listen carefully i can hear the trany making a lunking noise when it shifts. i checked fluid level and it is correct. im really worried because i just bought it and i dont need it going out. the only thing i can think of is maby doing a fluid and filter change. Also has anybody seen green transfer case fluid. Is that dealer only? thanx
  • gmcustsvcgmcustsvc Posts: 4,251
    Hello Jwttitze80912,
    Have you contacted the people you bought the vehicle from that there is a concern with the vehicle? Has anyone looked at the vehicle for the concern? Thank you,
    Mariah GM Customer Service
  • No i havent contacted them about it. I dont even know if they will even do anything about it. I work in the deisel mechanic feild and i do work on trucks but not these transmissions. A rebuilder said to grease the slip stub on the D/L. Another person said they have a tahoe and his has been doing it for six months. Do you think the dealer will jack me around and waste my time telling me its normal. What is the warranty on the powertrain from factory? Is it still 10yr, 100.000 miles?
  • gmcustsvcgmcustsvc Posts: 4,251
    Hello Jwttitze80912,
    I would contact the dealership about the problem and let them know what is going on. I would have a service tech ride in the vehicle with you so they can experience what you are talking about. I doubled checked for you and your 2005 vehicle doesn't have a powertrain warranty. Please keep me informed on how it goes. Thank you,
    Mariah GM Customer Service
  • t_westt_west Posts: 2
    Help.....I started my truck up today and was heading to the store when I went to turn a corner sharp and heard a noise coming from my front right tire. I noticed I was in Auto 4WD and stop to change the truck back to 2WD. When I did, the truck acted like it was in neutral through all gears and when I attempted to put in in park, it started grinding. I put it back in neutral and placed it back in Auto 4WD. If I select 4WD Hi or Lo, it makes a loud clunking noise and again, has issues going into park. Auto 4WD is the only push button selection I have that runs the truck.....any help would be great. (52500 miles)
  • t_westt_west Posts: 2
    Is there a known issue with this vehicles transmission? 2006 VortecMax 6.0L.
  • gmcustsvcgmcustsvc Posts: 4,251
    Hello T_west,
    Please email me your VIN number and I can check it for you. You can get my email by clicking on gmcustsvc. Thank you,
    Mariah GM Customer Service
  • jon8648jon8648 Posts: 1
    My 1500 silverado LT with 75000 miles on it is jumping into 4H, 4L for no reason at all. It is intermittent and has happened four or five times in the last three months. To put it back into 2W I have to stop it, put it in neutral and hit 2W or put it in D and crawl at three or four MPH and hit 2W and it will go back in. Sometimes I have to try three or four times to get it to go. Sometimes I have to shut it off and start it back up and it will automatically, magically appear in 2W. Any thoughts or has anybody else had this problem? I am going to take it to the dealer but I would like to know a little of what I am talking about when I talk to a tech. It runs fine when the tranny isn't acting up.
  • I have a 2001 GMC Sierra that's shifter cable has been stretched and it will no longer go into shift into park. Is there a way to adjust the stretched cable or do I have to replace it?
  • i love how every body else can comment about there problems but i never get any answer from any gm customer service rep to answer me . well i got a question how can 3 dealerships and one twice and as well as a gm tech say your truck is fine. but now the dealership i bought it from says oh it the torque converter that why you truck has shifting problems under 30 mph and why it has a problems with accelerating at a low speed. and all gm trucks have shifting problems so they manager says and then the dealership i took it to twice says yes there has been a raising number of trucks coming in with these same problems .
  • i love how every body else can comment about there problems but i never get any answer from any gm customer service rep to answer me . well i got a question how can 3 dealerships and one twice and as well as a gm tech say your truck is fine. but now the dealership i bought it from says oh it the torque converter that why you truck has shifting problems under 30 mph and why it has a problems with accelerating at a low speed. and all gm trucks have shifting problems so they manager says and then the dealership i took it to twice says yes there has been a raising number of trucks coming in with these same problems . :mad:
  • ahinsonahinson Posts: 17
    won't shift out og 1st.400 turbo/o.d. :sick:
  • I had the same problem with my 2007 1500-Classic. It felt like someone hit me in the rear everytime I stopped or it hit hard when shifting from 1-2nd gear. Brought it in at 36k and they greased the the yoke splines. This is just a band-aid to the real problem. I brought it in last week at 76k and they were aware of the problem and have to replace the slip yoke. Sad thing is they are not notifying owners of the problem. You must bring it in if you want it repaired and go through the corrective process. If you are close to the end of your 100k warranty I would suggest getting it in ASAP.

    I was given a copy of the document describing the problem.
    Document ID #2350684
    #09-04-17-002 (Bump Feel / Clunk Noise at stop or from launch (Clean/Lubricate propeller shaft Slip Yoke Splines) - (Sep 21, 2009)

    Models (2007-2009 Chevrolet Avalanche / Silverado)
    (2009 Surburban, Tahoe)
    (2007-2009 GMC Sierra)
    (2009 GMC Yukon, Yukon XL)
  • obyoneobyone Posts: 8,054
    Is that for real?

    That problem has been around since 1999.
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