P27F4
Gear Shift Lock Solenoid/Actuator A Performance/Stuck On
The shift lock solenoid for selector lever A stays engaged when release is commanded. Driver cannot move the selector out of Park or away from the locked gate.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Lock actuator mechanically stuckCommon
- Control driver stuck onPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Shift Lock Solenoid A
- Shift Lock Actuator A
- TCM
P27F4 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.