Grand Prix speedometer jumping and stalling - LS1TECH - Camaro and Firebird Forum Discussion

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Grand Prix speedometer jumping and stalling

Old 09-19-2018, 06:38 PM
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Default Grand Prix speedometer jumping and stalling

Hi, I have an 08 Grand Prix GXP with just under 100,000. The problem Iím having is the speedometer jumps when I come to a stop or I am going under 30 mph. My car also stalls occasionally when this happens. I replaced the speed sensor, the battery, and the alternator and nothing has solved the problem. Any help would be much appreciated.
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Old 10-02-2018, 01:31 PM
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Unfortunately, it's probably your torque converter/transmission failing. I have an 06 gxp that's been through two trannies now The first time it blew it would do this pretty badly, sometimes the speedo would jump to 50+mph while at a light. If you have more questions I'd jump in the ls4 forum section, lots of good info and super knowledgeable people there..
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Old 10-02-2018, 04:14 PM
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I bought the car with 50k on it with a bad trans and had it replaced. Iíve only put 43k on it. I knew they didnít last long but I figured Iíd get more than that out of it.
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