Code 62, Gear SW Error - Lumina: Notes

The 2nd gear switch should be open in 2nd and 3rd gears. PCM uses this signal to disengage TCC when downshifting.

1. Scan testers display switch status in different manners. Refer to manufacturer operating manual to determine proper status display. Because both switches should be in same state during this test, tester should display same status for both 2nd and 3rd gear switches.
2. Determines whether switch or signal circuit is open. Circuit can be checked for an open by measuring voltage at TCC connector. Reading should be about 12 volts.
3. Because switches should be grounded in this step, disconnecting TCC connector should cause scan tester to change status.
4. Switch status should change when vehicle shifts into 2nd gear.