Gate Select Actuator Circuit Low
What does P0912 mean?
The P0912 code means the vehicle's onboard diagnostic system has detected: Gate Select Actuator Circuit Low. This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Transmission cannot reach certain gear gates
- Gear selection limited to one or two gears
- Slow or incomplete gate selection movements
Probable Causes (Ranked by Likelihood)
- Short to ground in gate select actuator circuit Very High
- Faulty actuator motor with low current output High
- Water intrusion at actuator connector Moderate
- TCM output circuit fault Low
Step-by-Step Diagnostic Procedure
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Measure voltage at the gate select actuator connector
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Check for short to ground in the actuator wiring
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Inspect connector for moisture and corrosion
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Test actuator motor resistance
Frequently Asked Questions
What causes the gate select circuit to read low?
A short to ground in the wiring or a failed actuator motor can pull the circuit voltage below the expected minimum, triggering P0912.
Can I still select gears manually?
Automated manual transmissions do not have a manual override for the actuator. If the actuator cannot select gates, you are limited to whatever gear is currently engaged.
Is this a common failure on Smart cars?
Yes, the Smart ForTwo with its automated manual transmission is known for gate select actuator issues. Regular clutch and actuator maintenance helps prevent failures.