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Discussion Starter · #1 ·
After, I had left the ignition on and ran the battery down. I had to jump it off, of course. Now the speedometer, max's out to 85 and I assume the governor kicks in. The truck thinks I'm doing 85mph, but the fast as it will go is 37 mph. I know this by GPS, I disconnected the batteries, overnight, hoping to reset. Now the fuel gauge reads 0 and the speedometer problem is still there.
 

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The dash gauges all have a "stepper motor" that operates them.. A common problem for them to go bad. GM had a special Policy where they were repairing them for 70k miles or 7 yrs-- at no charge, for certain 04-05 vehicles.

You did not state the year or miles-- contact the dealer, or a speedo vendor.
 

· Recovering Diesel Addict
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When the stepper motors go it doesn't limit you to 37 mph tho. unless newer ones do?
 

· Recovering Diesel Addict
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are the batteries fully charged? I know after my truck is dead it does some strange shit until the batteries are up, and I cycle the key 2-3 times.

it was boosted with 12v and not hooked up wrong?
 

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When the stepper motors go it doesn't limit you to 37 mph tho. unless newer ones do?
Sorry KryPTiC ,You are correct, I missed that-- old eyes are not to good-!

Sounds like there is a electrical glitch where the TCM is getting incorrect speed reading, And going into the speed limiter. You might have to have someone scan it with a Tech II to find the problem.
 

· Recovering Diesel Addict
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· Recovering Diesel Addict
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Yeah for sure they are charged then, I would do like jc1843 said, have it scanned.
 
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