Code 31 PRNDL switch circuit: - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-16-2005, 05:45 PM   #1
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Default Code 31 PRNDL switch circuit:

Code 31 PRNDL switch circuit:


is this the same as park neutrul swith
is this something that can be done myself
ANY ONE WHO HAS DONE THIS BEFORE?
WHAT SHOULD I LOOK OUT FOR PLEASE.
I would hate to tear up my beatiful car
1992 bonneville sse
167,500 new tstat and 02sensor
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Old 12-16-2005, 07:58 PM   #2
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HELP ME PLEASE
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Old 12-16-2005, 10:27 PM   #3
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I only have the 97 FSM...all I could find is the information from given to you in your prior post about your code 31:

http://www.bonnevilleclub.com/forum/...switch+circuit

Is your car NOT starting now?

According to the '97 FSM for a similar code, there is either a bad connection (like Bill Buttermore had mentioned), the Park/Nuetral switch needs to be adjusted or is bad, or the PCM may need to be replaced.

I'll see if I can locate another gearhead with the earlier service manuals..sorry, bud...help will arrive eventually.
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Old 12-17-2005, 04:13 PM   #4
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yeah my car starts.
that page you linked is one of my previous post.
My cruise control doesn't work either so I checked all
my vacum tubes and played w/ cruise control servo
and it sounds loose. could the code be related to my cruise control not working.
When i push the throtle on cruise control servo the main throtle doesn't engage.
is this normal? is the park neutral switch under the cruise control servo what I should be concerned with or do I need to jack the car up and get at the top of the transaxle assembly?
1992 bonneville sse
I'll dust your azz
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Old 12-17-2005, 07:30 PM   #5
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I had my car scaned this week an it came up with the exact same code but i have noticed anything wrong with the car, excert for a problem with the key one day ( code 58 Pass Key Fall) it only happend one day but would they have anything do do with each other?
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Old 12-17-2005, 07:55 PM   #6
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If the car starts, ignore the code 31. It just means you have a bad or misadjusted switch. No performance issues with it.

Code 58 is a known BUG in the 92 PCM. Ignore it.
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Old 12-17-2005, 08:25 PM   #7
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not shure if I should repost but what'* the first thing I want to check if my cruise control does not work?
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Old 12-17-2005, 08:36 PM   #8
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Fuse, vacuum leak, TPS, and servo.
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Old 12-17-2005, 08:58 PM   #9
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willwren you rock
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