|Code||Fault Location||Probable Cause|
|P0910|| Transmission gate select actuator -circuit open |
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|Wiring, transmission gate select actuator, ECM/PCM/TCM|
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What Does Code P0910 Mean?
Dual clutch and automated manual transmissions often use what is referred to as gear shift actuator module (GSAM). The GSAM engages or disengages the clutch, as well as selects the transmission gear based on commands from the transmission control module (TCM).
An example of a gear shift actuator assembly, or module.
The select solenoid actuates a valve that applies hydraulic pressure to move the select shaft. This moves the shift fork into position in 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.
Code P0910 indicates there is a problem with the select solenoid circuit, most likely an open circuit.
What are the common causes of code P0910 ?
- Wiring problems
- Faulty TCM or TCM programming
- Faulty select solenoid
What are the symptoms of code P0910 ?
Symptoms associated with code P0910 may include an illuminated check engine light, a transmission that doesn’t shift properly or doesn’t shift at all.
How do you troubleshoot code P0910 ?
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 TSBs are found, locate the GSAM and perform a visual inspection of the unit and wiring. Repair as needed. If no problems are found up to this point, move forward with a sequential diagnosis of the system. Refer to the manufacturer’s service information for the exact diagnostic process.
It’s a good idea to obtain the factory wiring diagram before proceeding with diagnosis. Autozone offers free online repair manuals for many vehicles under their repair help section (http://www.autozone.com/repairinfo) and ALLDATA offers single vehicle subscriptions (http://www.alldata.com/oe-info-student-and-diyer).
A typical select solenoid wiring diagram
Test the solenoid: disconnect the solenoid connector. With the key and ignition off, connect a digital multimeter set to ohms to each of the solenoid winding terminals. Consult the factory repair information for the injector resistance specifications. If the resistance readings are not within specification, the solenoid should be replaced.
Another way to test the solenoid is to jump it. To do this, connect a jumper wire between the battery positive terminal and the B+ terminal on the solenoid connector. Connect the other jumper wire between the battery negative terminal and the ground terminal on the solenoid connector. In many cases, if the solenoid is working properly, you will be able to hear the solenoid engage when it is jumped.
Note: in some cases, the solenoid is not serviceable separately from the GSAM.
An example of solenoid testing
Check the circuit: You can check for continuity between the TCM and solenoid using a digital multimeter set to ohms.
To do this, first check the ground side of the circuit. Connect the meter between the ground terminal on the harness side of the solenoid connector and the solenoid ground terminal on the TCM. An over limit reading (OL) on your meter indicates there is an open circuit between the solenoid and TCM. If, however, you do not get an over limit reading, the TCM might be faulty or in need of reprogramming.
Next, check for continuity on the positive side of the circuit. Connect the meter between the B+ terminal on the harness side of the solenoid connector and the solenoid B+ terminal on the TCM. An over limit reading (OL) on your meter indicates there is an open circuit between the solenoid and TCM. If, however, you do not get an over limit reading, the TCM might be faulty or in need of reprogramming.