Code 68, Overdrive Ratio Error: Notes
The PCM/TCM monitors the difference in engine RPM and input shaft RPM. With transmission in Drive, scan tester reading should show engine speed closely matching input speed.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks the indicated range signal to the selected range. A faulty switch could set this code.
- Checks TCC for slippage while in a commanded lock-up state.