P0924 code meaning
Gear Shift Reverse Actuator Circuit/Open
Powertrain system Generic code P09xx codes Check engine light
What P0924 means
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.
P0924 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0924
- Transmission warning light on
- Some gears cannot be selected or the gearbox stays in neutral
- Gear changes out of the current gear may fail
Common causes of P0924
- Most likelyLoose, corroded or unplugged connector at the shift actuator or valve
- PossibleBroken drive wire between module and actuator
- PossibleOpen solenoid coil or motor winding in the actuator
- Less likelyFaulty driver stage in the transmission control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Gear shift reverse actuatorWiring harnessTCM
What each part of P0924 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9 | Area: transmission. |
| 24 | The exact fault in that area. |
What to do next
- Note P0924 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0924
What does P0924 mean?
P0924 means "Gear Shift Reverse Actuator Circuit/Open". Concerns the drive circuit that moves the shift mechanism of an automated manual gearbox in the reverse shift direction, i.e. It is a generic code, so it means the same on every make.
Is it safe to drive with P0924?
Drive gently and only to a workshop. With P0924 the car can go into limp mode (reduced power) to protect itself.
Will P0924 fail an emissions test?
Yes, it can. P0924 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0924 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0924 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.