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.
Transmission Control Module (TCM)
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Turbine Shaft Speed (TSS) sensor |
| 2 | - | Output Shaft Speed (OSS) sensor |
| 3 | - | Transmission Control Module (TCM) |
| 4 | - | Transmission Fluid Temperature (TFT) sensor |
| 5 | - | Transmission Range (TR) sensor |
| 6 | - | TCM transmission vehicle harness connector |
| 7 | - | Controller Area Network (CAN) + terminal |
| 8 | - | CAN - terminal |
| 9 | - | Reverse lamp relay power |
| 10 | - | PARK/NEUTRAL start enable signal terminal |
| 11 | 7G383 | Torque Converter Clutch (TCC) Variable Force Solenoid (VFS) |
| 12 | 7G484 | Shift Solenoid E (SSE) (ON/OFF) |
| 13 | 7G383 | Shift Solenoid D (SSD) VFS |
| 14 | 7G383 | Line Pressure Control (LPC) solenoid |
| 15 | 7G383 | Shift Solenoid C (SSC) VFS |
| 16 | 7G383 | Shift Solenoid B (SSB) VFS |
| 17 | 7G383 | Shift Solenoid A (SSA) VFS |
If the TCM detects a fault, it uses Failure Management and Effects Mode strategies to substitute a value or signal.
The TCM also uses Failure Management and Effects Mode strategies to compensate for detected solenoid or apply component faults that result in alternate shift patterns.
If the transmission loses complete electronic control, it will operate in a fail-safe mode with:
- Maximum line pressure in all transmission ranges
- Functional PARK, REVERSE and NEUTRAL positions
- Operation in 3rd or 5th gear (depending on the failure conditions) when the selector lever is in the DRIVE, 3, 2 or 1 position
- TCC is released in all transmission ranges and gears
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.