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.
Symptom Chart
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
| Symptom | Possible Sources | Action |
|---|---|---|
| Brake shift interlock override switch does not release correctly | Circuitry open/shorted Brake shift interlock override switch GSM |
GO to Pinpoint Test K |
| Transmission stuck in park position (Park by wire) | Park lock pawl solenoid GSM |
Park lock pawl solenoid pin stuck. REFER to: Diagnosis By Symptom - 8F35/8F40
.
REFER to: Diagnosis By Symptom - 8F57
. RESOLVE any communication DTCs between the GSM and the TCM. |
| Transmission returns to park automatically | The criteria for the return to park feature was met Driver door ajar switch, circuits, BCM or GSM |
Check the system for normal operation. REFER to: External Controls - System Operation and Component Description . Open then close the drivers door and cycle the door locks. If the door ajar icon is illuminated on the IPC and the door lock and unlock are not working correctly, REFER to: Locks, Latches and Entry Systems . If the door ajar and locks are working correctly, GO to Pinpoint Test H |
| Transmission does not return to park when the door is opened | Driver door ajar switch, circuits, BCM or GSM | GO to Pinpoint Test H |
| Transmission stuck in drive | GSM | CHECK for DTCs related to the GSM. |
| Internal transmission components damaged | CHECK the park lock pawl actuator, park lock pawl actuator valve and linkage for damage. REFER to: Transmission . | |
| Paddle shift does not operate correctly | Selector lever not fully engaging in S position Selector lever damaged PCM |
GO to Pinpoint Test L |
Use the Manual With the Right Hardware
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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.
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