Code 15 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-25-2007, 01:56 AM   #1
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Was driving my car the otherday and it woudn't shift worth a crap and then my check engine light came on, got a code key from autozone and it came back code 15, looked it up and some about the ECM wasn't getting a tach signal or speed signal. Any ideas or help would very welcome.
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Old 05-25-2007, 08:06 AM   #2
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Code 15 was a bad tach signal or bad speed sensor?

Techinfo says:
15 - Coolant Temperature Sensor Circuit ( Low Temperature Indicated )

You may want to check your temp sensor under the throttle body.
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Old 05-25-2007, 08:18 AM   #3
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I don't know...thats what the chilton book said(think it was chilton). code 15 was a bad signal, or all things are ok...something like that. Would a bad temp sensor screw with the shifting?
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