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2002 Pontiac Sunfire transmission will not upshift

Old 07-09-2019, 02:33 PM
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Default 2002 Pontiac Sunfire transmission will not upshift

2002 Pontiac Sunfire Ecotec engine. Worked fine in Dec. 2018 when I took it off the road. Putting it back into service and transmission stays in 1st gear will not upshift. Also, speedometer stopped working. When off road car was left outside thru the NY winter.

Need hint as to where to start looking for problem.

TIA,

Larry
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Old 07-09-2019, 05:28 PM
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Sounds like a speed sensor has gone bad . . . and/or since it was sitting, maybe a creature chewed through some wiring in just the right place.

I would start by connecting to the PCM with something that supports telemetry and see if any speed is being read by the PCM.
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Old 07-09-2019, 07:44 PM
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I agree, whereabouts in upstate NY you from?
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Old 07-09-2019, 10:40 PM
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Kingston
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Old 07-10-2019, 09:42 AM
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Originally Posted by LarryW View Post
Kingston
Oh, that'* just a few hours east of where I used to live before moving to Arizona.
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