Transmission only has second and third manual shift only and codes 66, 67, 81, 82?

Tiny
SDANDERSON5150
  • MEMBER
  • 1993 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • 360,000 MILES
Just rebuilt, less than a thousand miles, only has second and third manual shift only, have codes 66, 67, 81, 82.
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Sunday, September 17th, 2023 AT 2:51 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
I would check the fluid level first, this guide can help:

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

If the fluid level is okay it looks like the transmission is having a problem internally, either it is coming apart and clogged the filter or the front fluid pressure pump is weak.

Here are the code definitions:

Code 66 - Transmission Fluid Pressure Low

It could be caused by a failing transmission pump, a clogged transmission filter, or issues with the transmission fluid level.

Code 67 - Transmission Fluid Pressure High

This code indicates a high transmission fluid pressure condition.

Code 81 - 1-2 Shift Solenoid Valve Performance (4L60-E Transmission)

Code 82 - 2-3 Shift Solenoid Valve Performance (4L60-E Transmission)

Let us know how it goes. Please let us know if you need anything else to get the problem fixed.
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Monday, September 18th, 2023 AT 1:56 PM
Tiny
SDANDERSON5150
  • MEMBER
Was reading about if they all come on at the same time could be electrical. Cause I've replaced everything with seals gaskets, no clutch plates and seals, not sure if it matters, got a new wiring harness, but had the PWM solenoid, the wiring harness I took off does not, I left it disconnected. I don't have an obd 1 scan tool just using a program from tuner pro, it will show me shifting all gears, but stills says fault in a b shift solenoid and fault in TCC, but some of the info the computer showing, seems to be glitchy, I tried tracing some wires with a continuity probe, id touch one wire and it would light up on three other wires, and I'm not sure I read somewhere about getting a 94 wiring harness, I need to also replace the fluid switch, I had bought a new valve body, instead of doing the sonex upgrade kit, the one number matches on both, except there's a stamp on the new one that's 94, the old one there's a stamp 95 but not sure if that's just a batch number or year, pulled the transmission back out and started disassembling again but can't seem to find the problem.
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Monday, September 18th, 2023 AT 7:23 PM
Tiny
SDANDERSON5150
  • MEMBER
So, idk in my book I have 66 being the 3-2 solenoid 67 TCC solenoid, 81 2-3, and 82 1-2 solenoid.
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Monday, September 18th, 2023 AT 7:27 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
With that many codes I have seen the PCM be the problem FYI. Here is how to replace it if needed. Also, check the ground and power sources to the PCM. Check out the images (below). Please let us know what happens.
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Wednesday, September 20th, 2023 AT 5:07 PM

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