Concerns the drive circuit that moves the shift mechanism of an automated manual gearbox in the reverse shift direction, i.e. opposite to the forward actuator. It does not mean the reverse gear itself. Depending on design this is the second solenoid valve of a double-acting shift cylinder or the second rotation direction of an electric shift motor. The code sets when the module finds this output open or electrically faulty. No manufacturer documents the code publicly. A ZF patent assigns one 3/2 solenoid valve to each cylinder chamber, an Isuzu patent reverses the shift motor depending on shift direction. CARB requires circuit checks on outputs. P0925 to P0927 are the siblings, P0920 the forward direction. Gears in this direction cannot be engaged.
Medium severity. Can I keep driving?Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
Symptoms
- Transmission warning light on
- Some gears cannot be selected or the gearbox stays in neutral
- Gear changes out of the current gear may fail
Most likely causes
- Loose, corroded or unplugged connector at the shift actuator or valve
- Broken drive wire between module and actuator
- Open solenoid coil or motor winding in the actuator
- Faulty driver stage in the transmission control module
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P0924 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 9: Transmission
- 24: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0924?
Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
What causes code P0924?
The most common causes are: loose, corroded or unplugged connector at the shift actuator or valve; broken drive wire between module and actuator; open solenoid coil or motor winding in the actuator.
Related codes
- P0925Gear Shift Reverse Actuator Circuit Range/Performance
- P0926Gear Shift Reverse Actuator Circuit Low
- P0927Gear Shift Reverse Actuator Circuit High
- P0920Gear Shift Forward Actuator Circuit/Open
- P0910Gate Select Actuator Circuit/Open
Sources
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.