Why is my spedometer bouncung, Check engine light comes on and off,

Asked by Feb 25, 2013 at 03:29 AM about the Pontiac Grand Am

Question type: Maintenance & Repair

1 Answer

75,595

Sounds like a bad vehicle speed sensor. This sensor is on the transmission. It sends a signal to the computer to properly position the needle on your speedometer. If it fails it will set a trouble code & your "check engine" light will come on. It will also cause your speedometer to be erratic or not work at all. HTH. -Jim

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