4l80e speed sensors and external wiring info 

Bret McKinney hey I have Gmc suburban 2000 , the truck does not move in any gear , in other word , when I’m shift gear to D,R,3,2,1 the truck does not move ? Please need help.

@@Naser_astronomy 8-12 quarts of fluid?!. Does it have a filter?

There's also 3 sensor's on the transfer case

@@larrybradham9144 What pickup model year do you have?

Will that also cause the Ign 0 fuse to blow?

I would just look on google under images of 4l80e parts diagram. Are you having issues of setting up a transmission?

@@Bretmckinney I have just bought one for a project car and I would be keen to pull it down myself and go over it. While it’s apart I’d like to give it a freshen up.

I strongly suggest you buy this book when rebuilding your trans. It’s a good reference and has lots of pictures with a lot of transmission specs in it. I rebuilt a 48re Chrysler transmission and I could not have done it without the book for it. www.amazon.com/ATSG-4L80E-Transmission-Repair-Manual/dp/B002LL3UA8/ref=mp_s_a_1_2?crid=1DJCOVQ8AAOPR&keywords=4l80e+book&qid=1653924242&sprefix=4l80e+book%2Caps%2C200&sr=8-2

I’m really queries to know if you have 2 speed sensors on the side of your transmission and if your cruse control works? Some newer vehicles only had one transmission sensor on the side of the transmission. I think you are correct about the one on the tcase being the speedometer sensor. It should have a wire going to it. Tell me more about this truck. Is it original engine and trans? I have a feeling someone might have put a trans or tcase in from another year.

Also you should have a detent switch on the top of the tcase. Really possible your VSS is just not hooked up. It’s pretty hard to see the wiring under there.

Did you get this fixed? Sorry for the late reply. Sounds like a large internal failure. Overdrive possibly.

Not yet taking back to the trans shop they don’t have any electrical ppl so I’m trying to rewrite the second speed sensor

@@user-pk6we2gn6s I do have the bottom link that shows the 2 sensors and the pin location…. Sorry I’m not more help.

@@Bretmckinney I appreciate the help I did find a good video with a lot more detail thank you for the fast response !

I was thinking they were a twisted pair that went directly to the TCM, possibly a bulk head connector. Are you having trouble with your transmission?

Some vehicles need that sensor, and some don’t. What model year you working on? Are you installing a different transmission?

Things that come to mind are possible temperature sensor reading low not allowing it to upshift. My dads pickup had that issue and it was the torque converter itself. It would Shift in and out “shuttle shift” then kick it out completely after the check engine light came on. Just because the speedo works does not mean the transmission Computer is seeing speed. I would also air pressure check that the clutch pistons are not leaking air. If it never try’s to shift I would say it’s electrical. I’m no transmission expert though. TPS sensors do go bad... let me know what fixes it.

Any codes??? Blink codes can help a lot and can be retrieved with a paper clip.

For sure!!! What issues are you having?

The plug on the side of the transmission gets filled with fluid unplug it blow it out with a air compressor, vasoline it inside and limp mode go's away

my 2011 gmc sierra 1500 is having an issue thought the trans was slipping had it rebuilt and still have the same problem I'm lost

@@myguitaryourface5160 how much Vaseline are we talking about? Fill the plug or just cover the pins?

@@joshshaffer3716 I just put as much as possible in it

2 trany sensors for computer and a sensor for the speedometer on transfer case. I’m thinking after 1992 or 1993 they integrated the transfer case sensor into tcm to be able to get rid of one sensor. Your 4l80e case will still have a hole for one but will be plugged with a cap and the internal tone ring will be missing. This is normal. What issues are you having?

@@Bretmckinney I’m getting code 24 on my 93 k1500 I’ve already replaced the speed sensor I’m just confused because I see there might be a second speed sensor I’m unaware of

@@bossmodetubby That code from what I read is for the vehicle speed sensor on transfer case. Is that the sensor you replaced? It can be hard to see or put you hands on. What engine do you have?

@@bossmodetubby Transmission speed sensor www.amazon.com/ACDelco-24203876-Equipment-Automatic-Transmission/dp/B0013FTZUC/ref=mp_s_a_1_3?crid=55QW2V7YZ3R3&keywords=4l80+speed+sensor&qid=1637605674&sprefix=4l80+speed+%2Caps%2C260&sr=8-3 Vehicle speed sensor www.amazon.com/ACDelco-19302667-Original-Equipment-Vehicle/dp/B00S0FOD14/ref=mp_s_a_1_4?crid=3KR4HPSOWQUFT&keywords=1993+k1500+vehicle+speed+sensor+acdelco&qid=1637605842&sprefix=1993+k1500+vehicle+speed+sensor+ac+delco%2Caps%2C188&sr=8-4

Plss I’m tryna find where the speed sensor of Yukon 2007xl locate at 🤦‍♂️ is it the same with that one