What does the P0910 code mean?
Dual-clutch and automated manual transmissions often use what is called a Gear Shift Actuator Module (GSAM). The GSAM engages or disengages the clutch, as well as selects the gear ratio based on commands from the Transmission Control Module (TCM).
The selection solenoid activates a valve that applies hydraulic pressure to move the selector shaft. This moves the selector fork into position within the transmission assembly. In most cases, a shift solenoid is then used to engage the gear and a clutch solenoid is used to control the clutch. This process allows for automatic shifting of the manual transmission gears.
The P0910 code indicates that there is a problem with the selected solenoid circuit, likely an open circuit.
What are the common causes of the P0910 code?
Wiring problems
TCM programming or faulty TCM
Faulty selection solenoid
What are the symptoms of the P0910 code?
Symptoms associated with the P0910 code may include an illuminated check engine light, transmission that does not shift properly or does not shift at all.
How do you troubleshoot the P0910 code?
This code is often set in error. The first step is to clear the code, drive the vehicle (if possible), and see if it returns. If it does not, no further diagnosis is currently needed. Next, check for Technical Service Bulletins (TSBs) regarding the concern. If no TSB is found, locate the GSAM and perform a visual inspection of the unit and wiring. Repair as needed. If no issues are detected so far, proceed with a sequential diagnosis of the system. Refer to the manufacturer’s service information for the exact diagnostic process.
Test the solenoid: Disconnect the solenoid connector. With the key off and the ignition off, connect a digital multimeter set to ohms to each of the solenoid winding terminals. Consult factory repair information for the injector resistance specifications. If the resistance readings do not meet specifications, the solenoid must be replaced.
Another way to test the solenoid is to jump it. To do this, connect a jumper wire between the positive battery terminal and the B+ terminal of the solenoid connector. Connect the other connection wire between the negative battery terminal and the ground terminal on the solenoid connector. In many cases, if the solenoid is functioning correctly, you will be able to hear the solenoid click when it is jumped.
Note: In some cases, the solenoid is not separately serviceable from the GSAM.
Check the circuit: You can check the continuity between the TCM and the solenoid using a digital multimeter set to ohms.
To do this, first check the ground side of the circuit. Connect the multimeter between the ground terminal on the harness side of the solenoid connector and the solenoid ground terminal of the TCM. An over-limit (OL) reading on your meter indicates that there is an open circuit between the solenoid and the TCM. However, if you do not get an over-limit reading, the TCM may be faulty or require reprogramming.
Next, check the continuity of the positive side of the circuit. Connect the multimeter between the B+ terminal on the harness side of the solenoid connector and the solenoid B+ terminal of the TCM. An over-limit (OL) reading on your meter indicates that there is an open circuit between the solenoid and the TCM. However, if you do not get an over-limit reading, the TCM may be faulty or require reprogramming.
Codes related to P0910
DTC P0911: Gate Select Actuator Circuit Range/Performance
DTC P0912: Gate Select Actuator Circuit Low
DTC P0913: Gate Select Actuator Circuit High