My 4l80e is throwing a p1810. Takes about 60 seconds to shift into any gear. Just revs like neutral when in any gear.When it does it shifts into gear, it shifts great every gear. Im leaning towards the pressure switch. Also no speedo reading. I’m doing this test today. Thank you!!

@nickstransmissions

13 күн бұрын

Hi Sean, yep sounds like TFP aka pressure switch manifold. I believe when they fail you will have delayed engagements into gear because the switch isn't communicating the signal to the PCM indicating manual valve position (or it's doing it 'late'). Another consideration is the transmission wiring harness itself...Disconnect the case connector plug from the internal harness on the outside of the transmission and look to see if any fluid is leaking through the connector...If so, replace the wiring harness as well...Ohm out the rest of the solenoids to confirm they are working properly while you have the pan off...

Dude you're awesome that is really cool thank you so much that's an awesome video very good tutorial

@nickstransmissions

28 күн бұрын

Thank you for the kind words, Charles!

I have a higher almost fluid sound when going into drive or reverse. In park and neutral the sound goes away. It's in a 1995 chev G30 454. The van other then the odd sound seems to shift normally. I just recently bought this van. Any idea?

Great job

@nickstransmissions

Ай бұрын

Thank you, Chuck. Appreciate the kind words.

Awesome as always!!

@nickstransmissions

5 ай бұрын

Thanks, man!

Thanks, looks like valuable troubleshooting info

@nickstransmissions

5 ай бұрын

Thanks, SB!

You don’t have a video on replacing the temp sensor do you?

@nickstransmissions

13 күн бұрын

I do - the temp sensor is integrated into the wiring harness so you simply replace the transmission's wiring harness...See my 4L80E Basic Rebuild Series, PT3 for how to install the harness/temp sensor assembly: kzread.info/dash/bejne/hKqq1dGxfMS3ddI.html Skip to 20:17 where I begin installing the harness.

Is there an actual pressure sensor in the transmission that sends a pressure signal to the ECU? I don't see a pressure output pin in that diagram. Or does the ECM just do a calculated guess as to what the pump pressure should be even though the pressure might be physically low using a mechanical gauge?

@nickstransmissions

4 ай бұрын

The closest thing would be the continuity signal from the electronic pressure control solenoid. The ECM doesn't monitor literal trans pressures beyond what it has programmed to max the line pressure when it detects a fault that requires putting the transmission into limp mode. Are you having issues with your trans? If so, what's happening?

A common problem with the 4L80E is fluid leaking into the connector. That requires dropping the pan and replacing the internal wire harness.

@nickstransmissions

4 күн бұрын

Yep, very common. I mention it frequently in my videos and on the various forums I'm on.

When you tested. a b c. You grounded to the table. Was the component also grounded to the table .it looked like it was on a rag.

@nickstransmissions

2 ай бұрын

Thank you for watching, Tee Andrea. I filmed that about two months ago so don't recall the specific details but if there was a rag on the bench, the pointed probe would have went right through it and grounded to the steel bench top. I would have seen a disruption on the meter if the rag created a barrier to grounding the circuit.

I’m having an issue with mine and I can’t fine the issue it won’t shift past 2nd

@nickstransmissions

15 күн бұрын

It wont upshift from second gear or when it does, it feels like the vehicle is in neutral?

I have lost OD in mine. 1-3 no problem. Shifts normal. Do you have any ideas? Thank you.

@nickstransmissions

7 күн бұрын

Hi Tim, sorry to hear...Sounds like the OD clutch pack has burnt...Drop the pan, see what's at the bottom..If the fluid is black, smells burnt then you'll need to yank it for overhaul..You can check out my 4L80E rebuild videos for a thorough step by step review of the process.

@jf4872

4 күн бұрын

@@nickstransmissions What if there are no signs in the fluid?

@nickstransmissions

4 күн бұрын

Highly unlikely if the overdrive clutch burned; fluid will black, smell real bad. If he just doesnt upshift to fouth (ie pcm is not commanding or it is but valve body/solenoids arent responding, that's a different problem with different diag procedure. Bi-dir Scan tool with live data can be used to see if a shift is being commanded and/or command it to rule in or out electrical/electronic problems.

@jf4872

4 күн бұрын

@@nickstransmissions You have a recommendation for such scan tool for OBD-1?

@nickstransmissions

3 күн бұрын

For GM vehicles, I'd look for a TECH-1A for anything 82-91 and a TECH2 for anything 92-2013. If you need a tool that works across multiple makes/models, look at Snap On's scan tools. Their ODB1 line up uses multiple ALDL adaptors for each manufacturer and is compatible with most of their Modis, Solus and Verus line of scan tools.

Looking at your videos is very helpful. 2008 Cadillac Escalade esv 6.2. it will drive a little then stop going I have discount my battery then it moves a little again. Code p2723 goes. Wat u think. Thank you so much.

@nickstransmissions

3 ай бұрын

Thanks for watching and the kind words, Danny! Assuming you have a 6L80 in the Escalade, that code is for one of the clutch pressure control solenoid #5 which is on in 1st-4th gear and based on your description, it sounds like it has failed thus creating pressure loss inside the trans thus little to no movement. I'd drop the pan and begin continuity testing the individual solenoids, starting with CPC #5. If it's indeed no good, you will need to replace the entire TEHCM as the solenoids themselves are not replaceable individually. Here's the 6L80 ATSG manual with solenoid info for reference: atoc.ru/uploads/manual/5fb79aebb40df.pdf

@dannymaldonado8802

3 ай бұрын

Thank you very much for all the info u sent me. I appreciate it very much. One again thank you.and If I get into a bind hopefully I can write u again.

@dannymaldonado8802

3 ай бұрын

One more thing is that the same for a transmission 6180e 6.2 motor on my Cadillac Escalade esv.

@nickstransmissions

3 ай бұрын

You're welcome, Danny. Check your glove box for the RPO code list - it will have your transmission's RPO (MYC=6L80, MYD=6L90).