Codes

SEAN SILBERHOLZ

MEMBER
1993 CHEVROLET SILVERADO
5.7L
V8
4WD
AUTOMATIC
14,500 MILES

Hi, on my K1500 it is on one one system. I pulled two codes 28 and 32. I looked up both codes one was for transmission other was for EGR. Where should I start? Thanks. Also, if you know what I should do to test or anything like that I would appreciate it.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

I would start by testing the EGR valve to see if it is working. Here is a video of the job being done.

https://youtu.be/DqUCbbKdWf4

If is tests okay I would clear the codes and try again. How it is running?

Please let us know what you find.

Cheers, Ken

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Friday, October 6th, 2017 AT 4:20 PM

SEAN SILBERHOLZ

MEMBER
44 POSTS

Ok. So I cleared the codes and they came back. I don't have a tester for the EGR. I might replace it and clear the codes again. What should I do for the 28 code I know that is the Auto Transmission Range Pressure switch error. What does the pressure switch look like and how do I change it. Here is a picture of what I have seen. Here is another switch in the 4 picture. Thanks.

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Tuesday, October 10th, 2017 AT 9:28 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Code 28 Is an injector driver error

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

You may have a bad computer? I would try a used one there are plug and play so that's easy.

Please let us know what happens.

Cheers, Ken

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Wednesday, October 11th, 2017 AT 10:21 AM