Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Shift Solenoid "B" Circuit Check: Notes
Shift solenoid "B", also referred to as 2-3 shift solenoid, is attached to the valve body and is a normally open exhaust valve, which determine the transmission gear. Solenoid "B" (Green) is on in 3rd and 4th gears, but is off in 1st and 2nd gears. Fused ignition is supplied to solenoid "B". PCM/TCM engages solenoid "B" by grounding circuit No. 1223.
- This test checks shift solenoid "B" and the internal transmission wiring for short circuits.
- This test checks for power, from the ignition through the fuse, to the shift solenoid.
- This test ensures circuit No. 1223 is not shorted to ground.
- This test checks ability of PCM/TCM to ground or control the shift solenoid "B". If bidirectional scan tester is not available, TCC may be activated by grounding ALDL test terminal "B" with ignition on and engine off.
- This test ensures circuit No. 1223 is not shorted to ground.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.