Shift Solenoid "B" Circuit: Notes

Fig 1: Shift Solenoid "B" Circuit Diagram

Courtesy of GENERAL MOTORS CORP.

PCM/TCM turns on solenoid "B" during 3rd and 4th gear operation. Solenoid "B" is off during 1st and 2nd gear operation.

1. This step checks shift solenoid "B" and circuits inside transmission for shorts.
2. Battery voltage should be present at shift solenoid "B".
3. This step checks circuit 1223 for short to ground.
4. This step checks if PCM/TCM can control solenoid "B".
5. This determines whether circuit 1223 is open or PCM/TCM is faulty.