Question about 1993 Chevrolet K2500

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1993 chevy truck 4x4, 4L80e trans, codes 85, 86,. No shift. Only rev.& 1st. Help...

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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muttandjeff
  • 359 Answers

SOURCE: 4l80e shifting problems

SOUNDS LIKE SHIFTING SOLENOIDS ON VALVE BODY INSIDE TRANNY OR IT COULD BE BUFFER THAT COMUICATES WITH TRANNY OR OBC BEST TO LET TRANNY GUYS HAVE A LOOK @ THIS ONE RATHER THAN SPEND A LOT OF MONEY WITH LITTLE RESULTS

Posted on Feb 03, 2009

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michigan man
  • 3533 Answers

SOURCE: 1995 chevy 1500 4x4 pickup 4L60E trans

here is a place to call that sells only GM parts and they will also let you know what will fit your truck Schram auto and truck parts 1-800-292-1032

Posted on Feb 21, 2009

Molson02536
  • 3854 Answers

SOURCE: 4L60E Shifts fine in 1st, 2nd, & 3rd but will not shift into OD

The EMC detected and problem so it's in limp mode, As long as it's in limp mode the 4th and OD will not activate. Take care not to burn up the transmission by running it hard while your in the limp mode.
Your going to have to get the truck scanned to clear any codes and why there are DTC codes. Auto Zone scan for free and most auto shops charge $10.00 to $20.00 to scan sine they want the business.
If you want to clear the codes your self you can put the ignition to the run position and pull the ECM (Batt) fuse out for 20 sec and place it back in then start the truck. It may stall but let it, just start it again and this would have cleared all the DTC code history.
The transmission should be running fine unless there is a problem and the service engine light will be on again and you'll be in limp mode still with an updated DTC in the ECM.
Good luck and hope this helps.

Posted on May 26, 2009

Molson02536
  • 3854 Answers

SOURCE: 95 GMC K2500 4x4, 4L80E transmission problem

VSS is still good if you have your cruise control and speedometer working, it's common for the wire harness to the solenoid on the passenger side to get corroded and or the sires to break due to the heat given off from the catalytic converter beside the transmission. Check the condition of the wire harness and clean the contacts with brake cleaner and reinstall with some grease to keep the corrosion away, hint use marine grease. Marine grease cost a few cents more but resist water longer and better then normal lutetium grease, I use it on everything and get longer life out of my u-joints and front end suspension. Most transmission shop will test drive free of charge and scan the truck for DTC codes that sometimes will not show up in the check engine light, but mostly you do have an electrical problem so check all your fuses and wire harness from the ECM to the transmission. Good luck and keep me posted, be glad to help you get your truck running 100% again soon without some transmission shop getting you to replace the whole transmission for $2,300. If you are going to have the transmission service, "fluid and filter changed" Have them replace your boost valve. The boost valve is around $45.00, the boost valve controls the amount of transmission fluid pressure and low transmission fluid pressure will cause the transmission to fail. I replace mine every second transmission service and i have over 365,000 miles on mine. Keep up the good work friend.

Posted on Dec 15, 2009

Testimonial: "Excellent information from the beginning.Thank you.I worked each of the connections I could locate and disc. the bat to clear the code. Good so far. "

  • 2 Answers

SOURCE: 1997 Chevy 1500 P/U 4x4 small V8. Transmission shifting issue.

you may be confusing the torque converter clutch engagement with o.d. this trans has a problem with the T.C.C. regulator valve wearing out the valve body bore. this will cause the converter clutch to engage only sometimes or not at all. this will set a P1870 code in the control module. when this code is stored in the controller, ( check engine light may or may not be on), it increases the pressure in the transmission causing the 1-2 shift to be harsh. ask a local tranny shop to scan the vehicle ( most will do this for free) if this is the problem they can either fix your valve body (sonnax parts) or replace it with an upgraded valve body. hope this helps

Posted on Dec 16, 2009

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