Speedometer quit working after plug change, getting a code 12

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May 28, 2002 | 01:58 PM

StangKiller

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Joined: Feb 2002

Posts: 145

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From: Alabama

Speedometer quit working after plug change, getting a code 12

I changed my plugs yesterday, then went for a drive today and noticed the speedometer was not working, I figured I pulled a wire loose somewhere, so I checked all the wires and nothing is loose, checked the codes and I just get the 12 flash over and over, flash pause flash flash long pause flash pause flash flash. Is that normal for no codes? I know it's supposed to flash 12 3 times and then give the codes but all I get is 12, other than the speedo everything works and it drives good, thanks for any help.

Last edited by StangKiller; May 28, 2002 at 02:01 PM.

Jun 2, 2002 | 05:30 PM

12 Sec GTA

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Joined: Jan 2002

Posts: 600

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From: orlando

Car: 98 Camaro SS

Engine: LS1

Transmission: M6

if it only flashes 12, then there are no codes being thrown.

Jun 2, 2002 | 08:46 PM

Jza

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Joined: Jul 1999

Posts: 4,384

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From: Tulsa, OK

That probably means something between the ECM and the speedometer is messed up. If something between the ECM and the signal generator at the transmission were messed up, you'd get a code 24.