P0924: Gear Shift Reverse Actuator Circuit/Open
The P0924 code indicates an open or malfunction in the reverse actuator circuit of the transmission shift control system. This actuator is responsible for engaging reverse gear. When the powertrain control module (PCM) detects an electrical fault—such as a broken wire, poor connection, or failed actuator—it sets this code. The issue can prevent reverse gear engagement or cause erratic shifting.
01. Most Common Causes
- Open or shorted wiring in the reverse actuator circuit
- Faulty reverse actuator motor or solenoid
- Corroded or loose electrical connector
- Failed transmission control module (TCM) or PCM
02. Symptoms You Will Notice
- Reverse gear does not engage
- Transmission stuck in park or neutral
- Check Engine Light illuminated
- Erratic shifting or transmission warning message
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0924 and check for related codes.
Step 2: Visually inspect the reverse actuator wiring and connectors for damage, corrosion, or loose pins.
Step 3: Test the reverse actuator circuit with a multimeter for continuity and proper voltage (typically 12V).
Step 4: If circuit is intact, test the actuator itself by applying power and ground directly; if no movement, replace actuator.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe because reverse gear may not engage, and the transmission could behave unpredictably. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repair costs vary: wiring repair $100-$300, actuator replacement $200-$600, or TCM replacement $500-$1000.