Powertrain, generic · Transmission
P07F8 Stuck in Gear 9
Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible
P07F8 means gear 9 cannot be disengaged: the transmission stays in 9th despite the command to leave it. No manufacturer document available to us uses it. The family is documented only for 8th gear on eight-speed dual-clutch gearboxes (Maserati MC20: P07D7 and P07D8; Corvette 2020–23: P07D8), where hydraulic actuators move shift forks under position monitoring. Nine- and ten-speed planetary automatics from Ford, GM and Nissan report faults in 9th gear as a ratio code (P07F6) or through solenoid and clutch valve codes. The description follows the J2012 scheme and CARB's functional check of transmission outputs.
Likely causes
Shift fork actuator or shift valve sticking (contamination)
System pressure low or unstable (mechatronic pressure valve)
Shift fork, synchronizer or gear damaged
Fluid or filter contaminated
Symptoms
- Transmission stays in gear 9 and will not downshift
- Weak take-off after stopping
- Transmission warning, limp mode
Repair estimate
DifficultyHardWorkshop job
Parts and labour€150–4,000
Time0–12 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
shift fork actuatortransmission mechatronicsshift forktransmission control module
Related codes
References: law.cornell.edu, static.nhtsa.gov.