2004 Chevrolet Avalanche Logo
Posted on Feb 19, 2018
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2004 chevy avalanche 1st and reverse strong in tranny. no 2 3 or drive. replaced neutral safety switch on side . did not help. Check engine light came on after switch replaced. can not scan for code says to hook up scannerand it is and key is on on position scanner turned on. help please

1 Answer

Rick M

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  • Chevrolet Master 4,148 Answers
  • Posted on Feb 19, 2018
Rick M
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If you have the scan tool plugged in and it can't read data, that's a sign you have a short in a module on the data bus. The only way a DIYer can fix this is to get a shop manual with wiring diagrams and component locations and unplug every module on the data bus one at a time until your scan tool starts working. Then you replace the bad module

5 Related Answers

Anonymous

  • 5 Answers
  • Posted on Feb 05, 2009

SOURCE: Will not go into reverse/05 chev avalanche

chances are you have a transmission problem. If its just reving it means the transmission isn't catching. I would take it to a transmission specialist right away and be sure to call the seller. I would ask for your money back or have the seller pay for the repair cost, which may be a lot. Advice for the future: Always test drive the vehicle so you don't get ripped off.

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Anonymous

  • 195 Answers
  • Posted on Feb 09, 2009

SOURCE: chevy avalanche transmission problems

Hello;
Are you getting the check engine light? If so the electronics may have gone out. You may not need a rebuild but you won't know till you pull the oil pan on the transmission and inspect the contents. You may also have lost the neutral safety switch. It is mounted on the drivers side of the transmission. Check those out first and let me know what codes you get.
For Ponchoboy; the clunking and hissing you hear are teminal root causes. Drop the oil pan and if it has a lot of filings and metal it is time for a rebuild.
Hope this helps; Rate me highly;
Rich
RPM Northwest

dennymulford

Dennis Mulford

  • 1055 Answers
  • Posted on Apr 16, 2009

SOURCE: 1993 1 ton 4x4 suburban with a 4l80E tranny 1st and reverse only

your getting waer or antifreeze into the tranny,you need too either put an aux cooler on it or replace the raidator!!!!
then change the tranny fluid again also drain the tourq converter!!!!
try this before you rebuild the tranny!!!!

Anonymous

  • 1959 Answers
  • Posted on May 11, 2009

SOURCE: Transmission only has 1st and reverse 98 dodge ram 1500 5.9L 4X4

If you removed the radiator, the transmission cooler lines on the bottom would be the first place to check. Wouldn't take much to get a kink in the line, and a possible cause for your shifting problems. Best of luck to you.

Anonymous

  • 437 Answers
  • Posted on May 30, 2009

SOURCE: 1988 TH400 won't shift correctly

You will need a good manual that is focused on the transmission and possibly someone to lean over your shoulder to help you. Clean workspace is imperative. These are rather easy as you are for the most part stacking parts back into the housing when reassembling it. I would say look for a yard trans to put in it meanwhile and then you can learn at your leisure.

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Hello;
Are you getting the check engine light? If so the electronics may have gone out. You may not need a rebuild but you won't know till you pull the oil pan on the transmission and inspect the contents. You may also have lost the neutral safety switch. It is mounted on the drivers side of the transmission. Check those out first and let me know what codes you get.
For Ponchoboy; the clunking and hissing you hear are teminal root causes. Drop the oil pan and if it has a lot of filings and metal it is time for a rebuild.
Hope this helps; Rate me highly;
Rich
RPM Northwest
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