Gate Select Position Circuit High
Diagnostic trouble code P0907 indicates that the transmission control module (TCM) or powertrain control module (PCM) has detected a high voltage condition in the gate select position circuit. This circuit monitors the physical position of the shift gate mechanism in an automated manual or electronic transmission, and a high signal usually means the voltage has exceeded the maximum expected threshold.
This code is considered high severity because a failure in the gate select position circuit can prevent the transmission from shifting gears properly, potentially leaving the vehicle stranded or unable to engage drive or reverse.
Common symptoms
- Illuminated Check Engine Light
- Transmission fails to shift into certain gears
- Vehicle stuck in a single gear (limp mode)
- Inability to engage Drive or Reverse
- Harsh or erratic shifting
Likely causes
- Faulty gate select position sensor
- Damaged, shorted, or corroded wiring in the gate select position circuit
- Poor electrical connection at the sensor or transmission control module
- Mechanical failure or binding within the transmission shift gate mechanism
- Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM)
What to check before replacing parts
Scan for additional transmission codes and record freeze frame data.
Look for: Check if other shift position or circuit codes are present, which can help isolate whether the issue is a single sensor or a broader electrical/TCM problem.
Visually inspect the wiring harness and connectors for the gate select position sensor.
Look for: Look for chafed wires, melted insulation, corrosion in the connector pins, or loose connections that could cause a short to voltage.
Test the gate select position sensor circuit for a short to voltage.
Look for: Using a multimeter, verify if the signal wire is receiving battery voltage or a 5V reference voltage when it shouldn't be, indicating a short in the harness.
Test the gate select position sensor operation.
Look for: Monitor the sensor's voltage output with a scan tool or multimeter while manually moving the shift mechanism; the voltage should change smoothly without spiking to the maximum limit.
Inspect the mechanical shift gate mechanism for binding or damage.
Look for: Check if the physical linkage or internal gate mechanism is jammed, preventing the sensor from reading the correct position.
This page explains the generic P0907 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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