Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
HiCustomer Thank you for asking your question on Just Answer.
I assume this is an automatic transmission, but I just want to make sure. Just let me know if it is not.
This is the code for the Vehicle Speed Sensor or Automatic Transmission Output shaft Speed Sensor (AT OSS), which is mounted to the end of the transmission. It feeds its signal to the Powertrain Control Module, which controls the shifting AND drives the signal for the speedometer.
So this would be the prime suspect for the bad shifting and the speedometer not working.
If this answers your question, please click accept.
Take Care, Greg A.
Sorry about this - wrong question.
Please ignore this
need help on a 1999 Chevy K3500 pickup with a 7.4 L