2002 Aurora Crank Position Sensor (broken rpm gauge) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-21-2014, 10:39 AM   #1
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Default 2002 Aurora Crank Position Sensor (broken rpm gauge)

My wife was driving our 02 Aurora. The car suddenly lurched and the rpm gauge pegged to 8k rpm. Its driving fine, correct engine noise, engine temperature is fine. Anyone have any idea what happened? Methinks the rpm sender unit failed, but why the lurch? Its a little freaky. Any ideas would help. Thanks.
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Old 01-21-2014, 12:11 PM   #2
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the pcm bases your spark off the crank sensor and also the tach, if i had to guess it would be something like that. or loose battery cables or ground, those can do funky things too. does it still do it or was it just once then fine?
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Old 01-21-2014, 01:17 PM   #3
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Thanks for the response, and now I have an update. Apparently it has stalled out twice now as she is driving it home. If she is having stall out, maybe the crank sensor. Im still concerned it lurched when that happened.
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Old 01-21-2014, 01:53 PM   #4
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clean the battery terminals first, then drive it. if it stalls again try to see if the rpm gauge does something weird first
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Old 01-21-2014, 11:24 PM   #5
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Battery looks good. Pulled a p0385. Seems like crank position sensor. A couple misfire codes. Thoughts?
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Old 01-22-2014, 06:37 AM   #6
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If it'* the V-8 it has 2 crank sensors I would replace them both. GM had many problems with the north star crank sensors and updated the part many times.
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Old 01-22-2014, 08:02 AM   #7
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its the "short"star and from what i understand its pretty much the same as the northstar, so i would agree
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Old 01-22-2014, 09:32 AM   #8
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V6 yes. I plan to replace it tonight, then run the reset protocol. Its only one sensor on the short star as far as I can tell. Just above the starter. Thanks for the help. I had some misfires codes too, but I am guessing thats related.
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Old 01-22-2014, 09:35 AM   #9
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the definitions i saw said sensor b and if there is a b there must be an a
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Old 01-22-2014, 09:47 AM   #10
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Good point. I will keep looking. Thanks
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