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.
Theory Of Operation
The purpose of this diagnostic is to check the electrical performance of the on/off shift solenoid A (1) and B (2) circuits. Shift solenoid A (1) engages the Low, Reverse clutch when activated or the Over drive clutch when deactivated. Shift solenoid B (2) engages the 3rd , 5th , Reverse clutch when activated. The electrical failures that are detected include short to battery, short to ground, and open circuit. The power stage driver, which is located in the TCM, detects these electrical malfunctions.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.