What Does P0910 Mean?
The TCM has detected an open circuit in the gate select actuator circuit, which controls the left/right motion of the shift fork in an automated manual transmission. An open circuit means no electrical path exists to power the actuator, so the TCM cannot command gate selection. This completely disables the ability to move between gear gates.
Safety Warning
The vehicle cannot select gear gates, rendering the transmission unable to shift properly. The vehicle is not safe to drive and should be towed.
Common Causes
35%
Open circuit in wiring between TCM and gate select actuator
30%
Gate select actuator motor open winding (internal failure)
20%
Blown fuse or relay in gate select actuator power supply circuit
15%
Disconnected or damaged TCM connector
Diagnostic Steps
1
Step 1: Check the fuse and relay for the gate select actuator circuit — replace any blown fuse and inspect for the root cause of overcurrent.
2
Step 2: Disconnect the gate select actuator connector and measure resistance across the motor windings — expect 2-15 ohms; OL (open) confirms a failed motor.
3
Step 3: With the actuator disconnected, check for continuity on each wire from the actuator connector back to the corresponding TCM pins — any open wire indicates a harness break.
4
Step 4: Inspect the harness routing for physical damage, particularly near moving transmission components, heat sources, or sharp edges.
5
Step 5: Verify the TCM connector is fully seated and pins are not pushed back or damaged — use a terminal pick to check pin retention.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The TCM has detected an open circuit in the gate select actuator circuit, which controls the left/right motion of the shift fork in an automated manual transmission. An open circuit means no electrical path exists to power the actuator, so the TCM cannot command gate selection. This completely disab...
The most common cause of P0910 (Gate Select Actuator Circuit / Open [left / right motion]) is: Open circuit in wiring between TCM and gate select actuator
Typical repair costs for P0910 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle cannot select gear gates, rendering the transmission unable to shift properly. The vehicle is not safe to drive and should be towed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0910 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Automated Manual Transmission (Shift Control)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
