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Tachometer Pinned. Bad Stepper Motor?


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#1 psualumni

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Posted 30 April 2017 - 02:25 AM

I was driving on my way in for an overtime graveyard shift tonight and I noticed that my tachometer was misbehaving. It would read an increase in RPM as normal, but would not fall when engine RPM fell. Needless to say now my Tach is pinned passed 6K. Has anyone seen this before? Is it as simple as disassembling the dash and manually pushing the needle back down to 0? If I reset it manually I am afraid it will just pin out again. Anyone know what would cause this and how to fix it permanently?e63eb18e69e9c9e16a2e2a252ff93a28.jpg

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#2 8hnpSS

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Posted 30 April 2017 - 12:10 PM

unless your foot is slipping onto the gas peddle your stepper motor is stuck. its one of those things guaranteed to go wrong with the truck at some point. there are services who rebuild gauge clusters. ive used http://www.gmgaugeguy.com/ before on my old H2 worked perfect after.

 

its the actual stepper motor thats the issue. you would be just wasting your time pushing it back into place its going to bounce out of alignment again. if you are good with a soldering iron its an easy job to do on your own.


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#3 Downeast Johnny

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Posted 30 April 2017 - 12:13 PM

Stepper motor would be my first guess too.  When my speedo step motor went the speedo would read erratically, higher or lower than actual speed.  It never stuck at one setting though. 


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#4 psualumni

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Posted 30 April 2017 - 01:36 PM

Thanks guys. I'll replace the stepper motor and I'm pretty sure that should clear the problem. I've read of these instrument panels going bad as a common problem. Sort of a shame, my truck only has 30k on it!

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#5 Downeast Johnny

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Posted 30 April 2017 - 07:23 PM

Thanks guys. I'll replace the stepper motor and I'm pretty sure that should clear the problem. I've read of these instrument panels going bad as a common problem. Sort of a shame, my truck only has 30k on it!

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In that case, it failed from lack of use.  :jester:


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#6 LD03SS

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Posted 20 May 2017 - 07:29 PM

Stepper motor, it's a known failure in the clusters.
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#7 1981evildisco

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Posted 04 June 2017 - 10:10 PM

I was driving on my way in for an overtime graveyard shift tonight and I noticed that my tachometer was misbehaving. It would read an increase in RPM as normal, but would not fall when engine RPM fell. Needless to say now my Tach is pinned passed 6K. Has anyone seen this before? Is it as simple as disassembling the dash and manually pushing the needle back down to 0? If I reset it manually I am afraid it will just pin out again. Anyone know what would cause this and how to fix it permanently?e63eb18e69e9c9e16a2e2a252ff93a28.jpg

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send it off to GMGaugeGuy


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#8 EXGM

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Posted 05 June 2017 - 12:20 PM

that will fix it!


Edited by EXGM, 05 June 2017 - 12:20 PM.

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