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.

Code 31

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Old 05-18-2004, 12:30 AM
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Default Code 31

PRNDL circuit is there a fix for this code?
Old 05-18-2004, 08:47 AM
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Old 05-18-2004, 01:13 PM
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Sorry, I don't know either, but I've been living with this error code (and code 5 on my '92 SSE */c since I bought it in 1999. If anyone finds a fix for this, I'd like to know.

I recently asked a tranny shop owner about this error code, and he said not to worry about it because there are other mechanisms to tell the tranny what gear it'* in, and the PRNDL switch is expensive to replace.

After I talked with him, I looked at the switch and found that the mounting bolts were just a little loose. I cleared the error code and tightened the bolts and haven't had that error code since then. It'* been several weeks now, but I'd be surprised if the bolts were the cause of the error because although they were a little loose, there wasn't much clearance. The switch is mounted on the top of the tranny, driver'* side, where the linkage mounts to the top of the tranny also. It doesn't look like a 'switch' to me; it'* kinda odd looking.
Old 05-18-2004, 02:04 PM
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Ken, it'* very likely you just need to adjust the switch alignment. Do you have a maintenance manual? (dumb question for a Napa Manager, eh? )
Old 05-18-2004, 11:02 PM
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Originally Posted by willwren
Ken, it'* very likely you just need to adjust the switch alignment. Do you have a maintenance manual? (dumb question for a Napa Manager, eh? )
Yes i do i will look over it tonight and KENN WITH TWO N'*
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