P07F8: Stuck in Gear 9

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.

Symptoms

• Transmission stays in gear 9 and will not downshift
• Weak take-off after stopping
• Transmission warning, limp mode

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the fluid level and condition
2. Use the scanner to command the movement and compare the actual position with the requested one.
3. Read the input and output speed in live data
4. Check the connector and wiring
5. Check for other related engine codes
6. Consult the manufacturer's procedure for the transmission

Good to know

• Repair difficulty: hard
• It can trigger limp mode.

What each character of P07F8 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 7: Transmission
• F8: Specific fault in that system

Frequently asked questions

Can I keep driving with code P07F8?

Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.

What causes code P07F8?

The most common causes are: shift fork actuator or shift valve sticking (contamination); system pressure low or unstable (mechatronic pressure valve); shift fork, synchronizer or gear damaged.

Related codes

• P07F6Gear 9 Incorrect Ratio
• P07F9Unable to Engage Gear 9
• P07D7Stuck in Gear 8
• P07FBStuck in Gear 10
• P07FEStuck in Gear Not Specified

Sources

• law.cornell.edu: 13 CCR 1968.2
• static.nhtsa.gov: MC 11014333 0001

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.