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Old 07-26-2017, 05:17 PM   #1
mountie
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"88 GMC C2500 - ESC Module, issue?

My truck .. running fine, just coasting at 35mph, then , Service Engine Soon light / then ignition or ? stopped ... I thought the truck was going to die, then the light went out and truck ran fine. ( Took about 5 seconds)

The code eluded to the "just adjusted TPS".... and also the ESC ( Electronic Spark Control module).......

The ESC is interconnected to many components, like the TPS....

I am searching for a new ESC, just in case that's the problem, but anyone know of other parts that could also be connected to these parts?

I am having a difficult time finding a new ESC.......

Suggestions?
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Old 07-27-2017, 07:21 PM   #2
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Re: "88 GMC C2500 - ESC Module, issue?

Maybe I over described my question....

The trouble code for this problem involves the TPS & ESC, but other parts will also set the same code.

What other components would there be?
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Old 07-27-2017, 10:56 PM   #3
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Re: "88 GMC C2500 - ESC Module, issue?

Which transmission does the truck have?
Which engine does the truck have?
What code or codes did it set?
How did you retrieve the code / codes?
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Old 07-28-2017, 06:50 AM   #4
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Re: "88 GMC C2500 - ESC Module, issue?

Quote:
Originally Posted by ChevyTech View Post
Which transmission does the truck have?
Which engine does the truck have?
What code or codes did it set?
How did you retrieve the code / codes?
5.7 tbi 700r4

I think, #22 ( TPS low signal) but signal not low.... also mentioned ESC module. Code checker was a Snap On.
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Old 07-28-2017, 08:56 PM   #5
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Re: "88 GMC C2500 - ESC Module, issue?

Code 22 does not have anything to do with the ESC

First thing is to check and see what code is in the memory. Use a link below if you do not know how to read the codes without a scan tool.
http://www.chevytalk.org/fusionbb/sh...php?tid/273660
http://67-72chevytrucks.com/vboard/s...5&postcount=11

Then clear the code.

Verify the code is cleared.

Drive the vehicle and see if the code returns.

Code 22 can be set by a bad TPS or a poor connection to the TPS.
Have you moved the throttle stop screw?
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Old 07-29-2017, 08:14 AM   #6
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Smile Re: "88 GMC C2500 - ESC Module, issue?

The TPS is good / adjusted on the high side. The ESC also showed problems, as per a Snap On code reader. There's about 5 components that can affect the code.

( code was cleared)..... The truck lost ignition for 5 seconds, causing the code, but a TSP will not create that symptom.

An OBD 1 system is like a house. A code will tell you what room in the house is in defect, but sometimes it WON'T tell you what, "in the room is bad"....

( I do not see a OBD1 code specifically for an Electronic Spark Control module)

....unless it is described differently in the list?

( I appreciate the ideas..... just trying to solve this)
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Old 07-29-2017, 10:26 AM   #7
ChevyTech
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Re: "88 GMC C2500 - ESC Module, issue?

Quote:
The TPS is good / adjusted on the high side. The ESC also showed problems, as per a Snap On code reader. There's about 5 components that can affect the code.
The TPS and coolant temp sensor share the same ground, but if it lost ground the TPS would read high and it should have set a coolant sensor code.

Quote:
( code was cleared)..... The truck lost ignition for 5 seconds, causing the code, but a TSP will not create that symptom.
If the truck just mysteriously lost ignition for five seconds and then was ok again, the most common problem that causes that on these trucks is the ignition switch on the lower part of the steering column which has multiple power circuits through it and sometimes one circuit through it can lose connection while the others still work.

Quote:
An OBD 1 system is like a house. A code will tell you what room in the house is in defect, but sometimes it WON'T tell you what, "in the room is bad"....
I agree, OBD1 codes are not near as helpful as OBD2 codes.

Quote:
( I do not see a OBD1 code specifically for an Electronic Spark Control module)

....unless it is described differently in the list?
Code 43 for the knock sensor is the one that affects Electronic Spark Control.

Quote:
( I appreciate the ideas..... just trying to solve this)
My only ideas at this point are the ignition switch losing contact or a marginal connection to the TPS switch.
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