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What cause a 4l80e transmission not shift until u disconnect the battery for bout 3 to4 mins then hook it back up and then it will shift right.

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  • 327 Answers

My best guess would be something in the computer. Basically, when you disconnect the battery, you in essence, "reboot" the computer.

Posted on Nov 14, 2014

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Posted on Jan 02, 2017

Molson02536
  • 3854 Answers

SOURCE: transmission will not shift

Check the Vehicle Velocity Sensor (V V S)-(Speed Sensor) or the wire harness to the VVS. IF the ECM is not getting a signal from the V V S, the PCM can not give the signal to switch gears. The V V S is on the drivers side of the end ot the transmission that is held on by one bolt. Best thing to do is to have the truck scanned at Auto Zone for a DTC code and to confirm that the V V S has gone bad and they can give you the step by step instruction to replacing the sensor and takes about 15 min to do. Good luck and keep me posted. Keep an eye on the transmission fluid, make sure you don't run the transmission to hard and burn it out over a $40.00 sensor which is better then $1,800 for a transmission replacement. 

Posted on Jun 22, 2009

  • 57 Answers

SOURCE: shift cable disconnected from transmission

Sounds like either a part is broken or something needed is missing. First you need to know what is supposed to be and then you can figure "what is or isn't".
If you don't know enough about it, I would suggest you find someone who is better qualified to help make a determination here.

Posted on Oct 10, 2009

  • 1 Answer

SOURCE: replaced TBI with Carburator, 4L80E wont shift

all u need to do is get a holley electric choke carb model i think is 4150 or 4160 and get the tps sensor adapter for it it is around $110 and the carb is around $290 ur trans shifts off of the tps. all the other sensors are useless. i had that same problem with my 94 silverado.

Posted on Dec 06, 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. "

  • 1 Answer

SOURCE: model 2000 GMC shifting problem 4l80e transmission.

did you replace the torque converter I am having the same problem and I have been told the torque converter could be bad

Posted on Jan 26, 2010

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I have repaired the 4L80E on my tow truck, I have to do that almost every year, the last time it ran perfectly but when I push the pedal to the metal, it shifted from 3rd gear to 2nd and stays on 2nd gear until I turn the ignition off and start again.

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