97 Suburban Solenoid or Valve Body

SEMISANE00

MEMBER
1997 CHEVROLET SUBURBAN

I recently purchased a 97 Suburban V8 350 5.7 with 143K miles and the check engine light came on.

I plugged a code reader into it and it said that the shift solenoid a was either stuck or in the off position.

I dropped it off at a mechanic to have him check it and he replaced the two solenoids inside the tranny plate.

He called me up and said that the problem was still there and I was still losing 2nd and 4th gear and that he would have to take the valve body out and possibly rebuild/replace it.

When I talked to him today he had taken the valve body out but has still not figured out the problem.

Obviously, I have no clue when it comes to transmissions, but I just want to make sure i'm not getting screwed on mounting shop hours @ $80 per. (I'm up to 7 hours already)

Any help would be greatly appreciated.

Thanks

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

What is the code no. You came up with. Is it in between P0750-PO754

Check these sensors, coolant temperature, throttle position, vehicle speed sensors-these sensors influence the tranny operations such as overdirve up/down shifts/lock-up

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Friday, April 20th, 2007 AT 2:21 AM

SKIGOLFNUT

MEMBER
3 POSTS

My 2002 is having the same problem, I am getting codes 0740-0785-1860 all having to do with converter clutch circut malfunction.

1st my battery is bad repalced it, 2nd bad ground to block check that, then the ignition relay change that but dont buy part store china brand must be ac delco. Then last is ignition switch not making contac to engergize the tcc solenoid properly.

I am going to try change the ignition in mine this week to see if it fixes my problem.

Ronnie

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Wednesday, June 6th, 2007 AT 10:36 AM

SKIGOLFNUT

MEMBER
3 POSTS

Changed my ignition switch and it fixed the problem. Yea. When my dash lights would not light up it caused the tranny to code the solenioin valves. The ignition fuse was not hot, so it would not energize the tranny. Try the ignition switch it fixed mine.
Thanks

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Thursday, June 14th, 2007 AT 10:27 AM

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

The issue could be in the valve body, the electrical wiring/connectors, or the control module.

If you could, let me know what codes were found so I can look into it further for you. If I have the code, I should be able to identify possible causes. It isn't always the part that has failed. In most cases, it is something with the wiring.

As far as the valve body, if the fluid was clean, chances are that isn't where the issue is either. If it was very dirty, then that is a suspect.

Let me know.

Take care,

Joe

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Thursday, December 8th, 2022 AT 7:54 PM