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Chevrolet transmissions & drivetrains repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1991 Chevrolet Blazer - Transmissions & Drivetrains - 2/20/2014
    Looking for a reputable automatic transmission shop in the Portland Or metro area
    I have a 1991 Chevy full size Blazer 4x4 with TH700R4 transmission. was driving suddenly it acted like it slipped into neutral and that was it no more gears There was a slight vibration in park when cold at start up. fluid levels full and fairly recent change. now ...
     
    • Jimm
      2/20/2014 Jimm
      Use the 'Find-A-Shop', Estimate Cost and instant quotes features on the AutoMD website to locate a transmission repair shop in your area. Also, try word-of-mouth - ask around for recommended and trusted repair shops - often this is the best advertsing anyway.
    • HouseCallAuto
      2/20/2014 HouseCallAuto
      *Consider* buying your own rebuilt transmission and then you can have a choice of many more shops that can just "install" your unit. You will not be forced to deal only with tranny shops. Sometimes it works out better.
  • AutoMD Member
    AutoMD Member - 2005 Chevrolet Venture - Transmissions & Drivetrains - 2/20/2014
    Why won't my car start? Problems with P/N safety switch...
    I am having trouble with my 2005 Chevy venture. It is sometimes not starting. We have replaced the park neutral safety switch (thought to be the cause). when we turn the key if the P (park) or N (neutral) lights on the gear shift do not light up it will not start. ...
     
    0 answer
  • daniel
    daniel - 2004 Chevrolet Impala - Transmissions & Drivetrains - 2/19/2014
    I received code P1811 on my 2004 Impala. Every now and then car jerks but now all I hear is a whining sound please help!
    Changed oil pressure sensor (different code issue) and trans code disappeared but still having shifting issues. FWD, ATM.
     
    • Jimm
      2/19/2014 Jimm
      Code P1811 is hands down the most common trouble code and commonly asked about problem. This code can set for numerous reasons and often by a failing pressure control, but on higher mileage transmissions this is often not the case or at least is not the only cause to the problem. With that said it is important to understand that replacing the pressure control solenoid is not a guaranteed fix.

      This code will set when the pcm/tcm detects excessively long shift times. For every shift the pcm/tcm watches how long the shift takes to complete in milliseconds. If the shift times are over roughly the .06 second timeframe and the pcm/tcm tries to compensate for this by raising line pressure and still does not see acceptable shift times after a few shift cycle it will trigger code P1811. When this happens it puts the transmission in a max line pressure condition to help protect the transmission against excessive slippage and burnt clutches. While this condition is present you will feel harsh shifts, some vehicles more agressive than others, and you will also hear a whine noise similar to what a power steering pump that is low on fluid will sound like. You can shut the engine off for a brief moment and restart the vehicle and it will feel normal again until a few shift cycles of excessive shift times and the cycle will repeat itself. This typically only happens after you have driven for a short while and the transmission and its fluid warms up.

      Some common causes to this problem are-

      -Poor working PCS (Pressure Control Solenoid), also called EPC or Force Motor
      -Excessive clutch clearances
      -Poor functioning accumulator system
      -Worn internal seals and sealing rings
      -Excessive valve body wear
      -Dirty MAF sensor resulting in lower commanded line pressure

      Due to the list of potential problems it is difficult to suggest just one or two items to cure code P1811 as everything above and many other parts and variables all play a role in the effect. Unfortunately because of the orientation of this transmission and how it sits in a vehicle it requires quite a bit of labor to access the pressure control solenoid as well as the valve body.
      One thing popular to try before diving into an expensive and labor enduring repair is to install a shift improver kit such as the many shift kits that are available. This kit includes a new set of accumulator springs and spacers to limit accumulator piston travel which greatly speeds up the time it takes to apply a clutch, which hand in hand will shorten the shift time.

      Going to the expense of installing a shift kit as comparable to having the transmission rebuilt - so choice is yours.
      Jimm
      2/19/2014 daniel
      My car has 122,300 miles on it I was told it could be one of 3 things: needs a fluid change, bad torque converter, or a malfunctioning PCS
      Jimm
      2/19/2014 daniel
      But it is not a constant code it only shows itself when another problem code is present
    • HouseCallAuto
      2/19/2014 HouseCallAuto
      If replacing the PCS does not solve this then the tranny needs to be replaced.
  • AutoMD Member
    AutoMD Member - 2010 Chevrolet Impala - Transmissions & Drivetrains - 2/17/2014
    My car will not move into gear, it just sat at the light and would not go into gear
    car has 71,000 km on it and is still under warranty for power train. I had the car towed on Saturday to dealer where I bought it. What do you think the problem could be it would not do anything in drive, reverse 1st 2nd or 3rd it is an automatic. They have not ...
     
    • HouseCallAuto
      2/17/2014 HouseCallAuto
      Sure does sound like an internal transmission failure to me.
  • AutoMD Member
    AutoMD Member - 2006 Chevrolet Silverado 1500 - Transmissions & Drivetrains - 2/13/2014
    Possible transmutation problems or is this a computer issue?
    My truck has jumped in to gear 3 times this past week when it has done this it feels like it starts out in 3rd gear. i have to give it a lot more gas to accelerate from a complete stop. Im not sure whats going on. My check engine light turned on the first 2 day and ...
     
    • HouseCallAuto
      2/12/2014 HouseCallAuto
      If you want to try to continue with this yourself, the next step is to plug in a code reader to find out what fault codes are stored. The check engine light need not be illuminated for codes to be there and the fact that the light was on means there are definitely codes there just waiting for someone to access them. Get a code reader and do it.
      HouseCallAuto
      2/12/2014 AutoMD Member

      unable to get a reading from a code reader.
    • HouseCallAuto
      2/12/2014 HouseCallAuto
      What happens when the code reader is plugged in? Error message? Does the reader come alive? The connector has to be able to power the reader just for it to turn on. Does it turn on? The conversation cannot end here. You must confirm a communication link between the code reader and the vehicle computer.
      HouseCallAuto
      2/12/2014 AutoMD Member
      nothing happens with the communicator it does not power on or receive a code. The computer has power when unplugged it shows the previous code.
    • HouseCallAuto
      2/13/2014 HouseCallAuto
      Check the CIG LTR fuse as this fuse supplies battery voltage to pin 16 of the data link connector and if this fuse is open (as it often is) the code reader will not function when it is inserted because it needs battery voltage to turn on.
  • AutoMD Member
    AutoMD Member - 2006 Chevrolet Silverado 1500 - Transmissions & Drivetrains - 2/12/2014
    Possible transmutation problems or is this a computer issue?
    My truck has jumped in to gear 3 times this past week when it has done this it feels like it starts out in 3rd gear. i have to give it a lot more gas to accelerate from a complete stop. Im not sure whats going on. My check engine light turned on the first 2 day and ...
     
    0 answer
  • horace
    horace - 2002 Chevrolet Trailblazer - Transmissions & Drivetrains - 2/11/2014
    When I put the Trans in drive I have to press on the pedal to move the vehicle.
    Once the vehicle starts to move and switches to 2nd gear the Trans responds when I press on the accelerator
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2009 Chevrolet Malibu - Transmissions & Drivetrains - 2/11/2014
    Had Transmission changed shouldn't the torque converter have been changed also?
    50,300. Had transmission changed 6/2012. Few months later started changing gears very rough. It's like its jumping into gear when changing. Gets worse when the weather is warm. Nothing shows up on the computer when they hook it up. But with a new not rebuilt ...
     
    • AutoMD Member
      2/11/2014 AutoMD Member
      Every time that I had automatic transmissions changed, the torque converter was replaced. Old fluid and debris in the old torque converter can and will contaminate the new fluid in transmission. Also the transmission oil cooler and all lines should be thoroughly flushed to avoid contamination.
  • DIY Dave
    DIY Dave - 2005 Chevrolet Equinox - Transmissions & Drivetrains - 2/11/2014
    Why do i have vibration in my arm rest/ seat?
    I have vibrations in my arm rest/ seat at high speeds Replaced rotors, stabilizer links, lower control arms, balanced tires, center driveshaft support bearing replaced & front cv boot repaired, replaced engine gaskets, spark plugs, water pump, egr valve & wiring ...
     
  • AutoMD Member
    AutoMD Member - 1998 Chevrolet Cavalier - Transmissions & Drivetrains - 2/9/2014
    I stopped in for a free check engine scan at a local shop. the tech pulled the codes and told me I need a transmission.
    My car runs fine. My son checked the transmission fluid and it is red and the correct level. I have no stalling, no shaking, the gears move smoothly. is he lying to me?
     
    • John's Auto Repair
      Did it happen to be a transmission shop? Why did you want your computer scanned? If the vehicle
      is running fine, I doubt you would need a complete transmission replacement. Go to any major
      parts store like AutoZone, Advanced, etc. They will scan your codes for free, also. Let me know
      what they find.
    • HouseCallAuto
      2/9/2014 HouseCallAuto
      Well in a word, yes he is lying. I know of no fault code that would automatically go to "bad transmission". You need to buy your own code reader at amazon.com for about $20 and plug it in and read the codes and then post the code or codes here. Don't panic and agree to any service yet.
  • AutoMD Member
    AutoMD Member - 1992 Chevrolet S10 - Transmissions & Drivetrains - 2/8/2014
    Why will my pickup not go into any of the drive gears when I shift?
    It will go into park and reverse and neutral but when I shift into drive or low 2 or 1, it will not engage. After sitting for a while it will go then I can shift it into drive and it is fine.
     
    • Jimm
      2/8/2014 Jimm
      As the first tsep - check the transmission fluid level, refill as necessary. Another possibility is a clogged fluid filter. When was the most recent fluid and filter service performed? A clogged trans filter can block fluid flow to one or more forward gears.
  • Joe
    Joe - 2003 Chevrolet Silverado 1500 - Transmissions & Drivetrains - 2/7/2014
    I have a knocking noise coming from underneath and it seems to be coming about mid length of the truck any ideas on it?
    Started after using my four wheel drive and also one traveling continues to make a light tapping noise
     
    • HouseCallAuto
      2/7/2014 HouseCallAuto
      Might be a bad universal joint in driveshaft.
      HouseCallAuto
      2/19/2014 Joe
      What's a good way to check that out without driving it
  • AutoMD Member
    AutoMD Member - 2008 Chevrolet Corvette - Transmissions & Drivetrains - 2/5/2014
    Can I bolt this motor directly to transmission without more parts or do I have to have a adapter piece?
    Also can you tell me if this is connected together how long it would be from front of motor to drive axle?
     
    • Jimm
      2/4/2014 Jimm
      Not sure - you left out details; what type and year transmission? Is the transmission a manual or automatic? If manual, what clutch and bellhousing (if any) will be used?
    • AutoMD Member
      2/4/2014 AutoMD Member
      2008 Corvette with 6.2L motor & automatic transmission.The motor and tranny are both out of this car.
    • Jimm
      2/5/2014 Jimm
      Need more information - what type of automatic transmission? Is this the model 6L80E six speed transmission? If yes, then no adapter is needed as it will bolt directly to the 6.2L engine.
  • AutoMD Member
    AutoMD Member - 1999 Chevrolet Blazer - Transmissions & Drivetrains - 1/30/2014
    Blazer sat for 4/5 days, then pushed button on dash from 4wauto back to 2W, indicated light didn't come on, then tried
    push back to 4wauto, or any other settings, no indicator light on? when trying to drive seems like trans. stuck in low gear. Had never had this problem before, even in extreme cold weather!
     
    0 answer
  • gofast13
    gofast13 - 1997 Chevrolet K1500 - Transmissions & Drivetrains - 1/29/2014
    4wd low lock light is flashing
    my scan tool says p1875 low switch circuit electrical and it wont go into 4wd hi the light comes on but nothing.
     
    0 answer
 
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