P0924 Gear shift reverse actuator: open circuit

By: Diagno editorial team · Updated: 2026-10-15

P0924 means: Gear shift reverse actuator: open circuit. The automatic gearbox module has found a fault. Drive gently and have the car checked soon. The most common repair costs about €45–90 in Estonia, depending on make and model. The most common cause: connector loose, damp or corroded.

What it means

The automatic gearbox module has found a fault. The gearbox may go into limp mode: it holds one gear and shifts harshly or not at all. The computer sees no current in the circuit, so something is open: a wire, a connector or the part's winding.

What you may notice

• Stuck in one gear (limp mode)
• Harsh or late gear changes
• Gearbox slipping
• Engine or gearbox light on

What could be wrong

1. 1Connector loose, damp or corroded · Wiring or connector repair €45–90
2. 2Wire broken or chafed · Wiring or connector repair €45–90
3. 3Faulty solenoid or sensor · Gearbox solenoid replacement €250–500
4. 4Engine computer fault (rare) · Control unit check and software €150–300

Repair difficulty: Hard

What you can check yourself

First look at the connector and wiring: anything loose, melted or green with corrosion? Read the gearbox module's own codes too. If the gearbox slips, drive gently and don't tow a trailer. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

1. We read the fault data on the diagnostic tool and check whether the fault is constant
2. We measure the circuit's supply, ground and signal
3. We repair the wire or replace the connector
4. If the wiring is fine, we replace the solenoid or sensor

Standard SAE description: Gear Shift Reverse Actuator Circuit/Open