P07FB: Stuck in Gear 10

P07FB means gear 10 cannot be disengaged: the transmission stays in 10th 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, Corvette 2020–23); no dual-clutch gearbox with ten gears and these codes is known. Ten-speed planetary automatics from Ford and GM report faults in 10th gear as a ratio code (P07F7, on Ford's 10R140 with 10th gear locked out) or through valve codes. The description follows the J2012 scheme and CARB's functional check of transmission outputs.

Symptoms

• Transmission stays in gear 10 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 P07FB means

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

Frequently asked questions

Can I keep driving with code P07FB?

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

What causes code P07FB?

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

• P07F7Gear 10 Incorrect Ratio
• P07FCUnable to Engage Gear 10
• P07D7Stuck in Gear 8
• P07F8Stuck in Gear 9
• 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.