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.
Valve Body: Description
| 1 - Solenoid A |
| 2- Solenoid D |
| 3 - Solenoid B |
| 4 - Solenoid E |
| 5 - Solenoid C |
| 6 - TCC Solenoid |
| 7 - Line Pressure Solenoid |
| 8 - Park Release Solenoid |
| 9 - Park Hold Mechanical Solenoid |
| 10 - Park Release Mechanical Valve |
The Transmission Control Module (TCM), or Transmission Control Module Assembly (TCMA) is extremely sensitive to Electrostatic Discharge (ESD). Always use a ground strap and follow the ESD guidelines in ELECTROSTATIC DISCHARGE (ESD) SENSITIVE DEVICES. Failure to follow these instructions may result in damage to the TCM/TCMA.
The solenoids are integrated into the Transmission Control Module Assembly (TCMA) of the 8HP50 transmission and are not replaceable individually.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.