What Does P0924 Mean?
The TCM has detected an open circuit in the gear shift reverse actuator, which controls the rearward motion of the shift mechanism for engaging even-numbered gears (2nd, 4th, 6th) and reverse in an automated manual transmission. Without electrical continuity, the TCM cannot command even-gear or reverse engagement.
Safety Warning
Even-numbered gears and reverse cannot be engaged. The vehicle will have severely limited gear selection. Do not drive; tow the vehicle to a qualified repair facility.
Common Causes
35%
Open wiring between TCM and gear shift reverse actuator
30%
Gear shift reverse actuator motor open winding failure
20%
Blown fuse or open relay in reverse actuator power circuit
15%
Disconnected actuator connector or severely damaged pins
Diagnostic Steps
1
Step 1: Check the fuse and relay for the shift reverse actuator circuit — replace blown fuse and investigate overcurrent cause.
2
Step 2: Disconnect the reverse actuator and measure motor winding resistance — expect 2-15 ohms; OL confirms open winding failure.
3
Step 3: Check for continuity from the actuator connector through the harness to the TCM connector on each wire — repair any open circuits found.
4
Step 4: Inspect the actuator connector for heat damage, broken lock tabs, backed-out pins, or corrosion.
5
Step 5: Verify TCM output pins provide proper drive voltage when commanding the reverse actuator — no output indicates a TCM driver fault.
Estimated Repair Cost
$200 - $1,300
Parts + labor, varies by vehicle and location
The TCM has detected an open circuit in the gear shift reverse actuator, which controls the rearward motion of the shift mechanism for engaging even-numbered gears (2nd, 4th, 6th) and reverse in an automated manual transmission. Without electrical continuity, the TCM cannot command even-gear or reve...
The most common cause of P0924 (Gear Shift Reverse Actuator Circuit / Open [rearward motion, even gears, 2,4,6]) is: Open wiring between TCM and gear shift reverse actuator
Typical repair costs for P0924 range from $200 to $1,300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Even-numbered gears and reverse cannot be engaged. The vehicle will have severely limited gear selection. Do not drive; tow the vehicle to a qualified repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0924 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automated Manual Transmission (Shift Control)
Difficulty
Type
Generic (SAE)
Recommended Tools
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