speedometer is erratic transmission shifting rough
How long since you had a tranny service?
My 2000yr 2500 Express [5.7 with 4L80 Gb.] has also has erratic speedo and transmission shifting issues. Notes: 1. Shifts early to highest gear..doing 30-35 and speedo reading 60+ . 2. No Codes showing on scanner. No dash check engine light or other warning light. 3. I Installed a New VSS 'Vehicle Speed Sensor' ($59) but it didn't solve the problem.but usually is the cause. 4. Wiring looks okay..but now having to check from tranny to VCM. 5. Very surprised there were No codes/ DTC's. 6. So currently still trying to figure out... 7. Got the books out to work thru. other potential causes..not that the GM Manual helps much! Other Possibilities: ???? a, Maybe could be corrosion on a connector somewhere? causing the VCM to not get the correct voltage/signal. Input appreciated.
Any movement on this problem? I'm having the same issues on my 2002 Chevy Express 3500. I've replaced the ECM, VSS, Ground Strap all to no avail.
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