Code 31, 18, 41, 58 - 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 06-06-2004, 12:18 AM   #1
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Default Code 31, 18, 41, 58

n e 1 knows fixes???
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Old 06-06-2004, 12:43 AM   #2
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Techinfo is just a click away, bud.

31 is PRNDL switch circuit. Not a big problem. It'* a switch, and won't cause you performance probs.

18 is cam/crank error. That shouldn't come as a surprise Possibilities are interruptor magnet, sensor, wiring harness, or pcm.

41 is cam sensor circuit. Ditto, but this could also include the ICM.

58 is Passkey, or Vats if you prefer. It'* probably a false code.
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Old 06-06-2004, 11:19 AM   #3
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Quote:
Originally Posted by willwren
Techinfo is just a click away, bud.

31 is PRNDL switch circuit. Not a big problem. It'* a switch, and won't cause you performance probs.

18 is cam/crank error. That shouldn't come as a surprise Possibilities are interruptor magnet, sensor, wiring harness, or pcm.

41 is cam sensor circuit. Ditto, but this could also include the ICM.

58 is Passkey, or Vats if you prefer. It'* probably a false code.
pcm or icm????
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Old 06-06-2004, 12:53 PM   #4
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Quote:
Originally Posted by Kennginn
Quote:
Originally Posted by willwren
Techinfo is just a click away, bud.

31 is PRNDL switch circuit. Not a big problem. It'* a switch, and won't cause you performance probs.

18 is cam/crank error. That shouldn't come as a surprise Possibilities are interruptor magnet, sensor, wiring harness, or pcm.

41 is cam sensor circuit. Ditto, but this could also include the ICM.

58 is Passkey, or Vats if you prefer. It'* probably a false code.
pcm or icm????
Code 41 would be everything listed in 18 PLUS the ICM.
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Old 06-06-2004, 01:32 PM   #5
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whats da pcm?? n00b question i know
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Old 06-06-2004, 01:37 PM   #6
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Powertrain Control Module = PCM
All the 92+ cars have this, because it controls the entire powertrain including the trans.

91 and older, without the electronic Trans have ECM'* (Engine Control Module).

Same thing, anyway. The main brain. The chip. The computer. Underneath the glovebox on your car, or near the airbox on a Series 2.
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Old 06-06-2004, 02:48 PM   #7
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Well as Bill sugests the code 18 and 41 are probably the same problem, burnt harness. Did you find a replacement or repair your old one?

The prnd321 switch maybe a loose connection or poor ground?

The vats system is tricky to diagnose but first start with the key, best answer maybe to get a vats bypass kit?
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Old 06-06-2004, 03:10 PM   #8
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PRNDL code may just be a misalignment of the switch. There'* an alignment procedure in all service manuals for it. Clymer, Haynes, Chiltons, FSM, etc.

Check Everything Electrical for more info on his harness problems.
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