Gate Select Actuator Circuit High
Diagnostic trouble code P0913 indicates that the powertrain control module (PCM) or transmission control module (TCM) has detected an abnormally high voltage signal in the gate select actuator circuit. This actuator is responsible for controlling the side-to-side movement of the shift mechanism in an automated manual transmission, and a high circuit reading typically points to a short to voltage or a faulty actuator.
This code is considered high severity because a failure in the gate select actuator circuit can prevent the transmission from shifting gears properly, potentially leaving the vehicle stranded or unable to engage certain gears.
Common symptoms
- Illuminated Check Engine Light
- Inability to shift into certain gears
- Transmission stuck in a specific gear
- Harsh or erratic shifting
- Vehicle enters limp mode
Likely causes
- Short to voltage in the gate select actuator wiring harness
- Corroded or damaged electrical connectors in the actuator circuit
- Faulty gate select actuator
- Blown fuse or fusible link related to the transmission control circuit
- Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM)
What to check before replacing parts
Scan for all present DTCs and record freeze frame data.
Look for: Check if other transmission or electrical codes are present, which could indicate a broader electrical issue or shared ground/power problem.
Visually inspect the wiring harness and connectors for the gate select actuator.
Look for: Look for chafed wires, melted insulation, corrosion, or loose pins that could cause a short to voltage.
Test the gate select actuator circuit for a short to voltage using a digital multimeter.
Look for: Disconnect the actuator and TCM, and measure voltage on the signal wire with the key on; any voltage present indicates a short to power in the harness.
Measure the internal resistance of the gate select actuator.
Look for: Compare the resistance reading to the manufacturer's specifications; an out-of-spec reading indicates a faulty actuator.
Check the power and ground circuits at the Transmission Control Module (TCM).
Look for: Ensure the TCM is receiving proper voltage and has a solid ground, as poor connections here can cause erroneous high circuit codes.
This page explains the generic P0913 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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