Damaged or chafed wiring harness between the gear selector and TCM, causing a short to voltage; Faulty gate select position sensor or switch inside the gear selector assembly; Corroded or loose electrical connectors at the sensor or TCM; Water intrusion into the connector or sensor, leading to abnormal voltage; Internal failure of the TCM affecting the sensor reference or signal circuit; Aftermarket accessories or improper wiring repairs that introduce voltage into the circuit

DTC codes / P09xx · Transmission / P0907

P0907Gate Select Position Circuit High

Q: What does code P0907 mean?

Gate Select Position Circuit High. P0907 indicates that the transmission control module (TCM) has detected an abnormally high voltage on the gate select position circuit, which is used to confirm the position of the gear selector gate. The circuit typically operates between 0 and 5 volts, and a high reading means the signal wire is seeing voltage above the expected range, often near battery voltage, which the TCM interprets as a fault.

P0907 indicates that the transmission control module (TCM) has detected an abnormally high voltage on the gate select position circuit, which is used to confirm the position of the gear selector gate. The circuit typically operates between 0 and 5 volts, and a high reading means the signal wire is seeing voltage above the expected range, often near battery voltage, which the TCM interprets as a fault.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

Illumination of the check engine light or transmission warning light
Transmission may enter limp mode, limiting gear selection or holding a single gear
Difficulty moving the gear selector or inability to select certain gears
Harsh or delayed shifts as the TCM defaults to a safe strategy
Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

Damaged or chafed wiring harness between the gear selector and TCM, causing a short to voltage
Faulty gate select position sensor or switch inside the gear selector assembly
Corroded or loose electrical connectors at the sensor or TCM
Water intrusion into the connector or sensor, leading to abnormal voltage
Internal failure of the TCM affecting the sensor reference or signal circuit
Aftermarket accessories or improper wiring repairs that introduce voltage into the circuit

How to diagnose and fix it

Verify the code with a scan tool and check for any related codes in other modules
Inspect the wiring harness and connectors at the gear selector and TCM for damage, corrosion, or loose pins
Measure the voltage on the gate select position signal circuit with a multimeter and compare to the manufacturer's specification
Disconnect the sensor and check for a short to voltage on the signal wire; repair as needed
Test the gate select position sensor with a multimeter or scan tool live data to confirm proper operation
If the sensor is faulty, replace the gear selector assembly or sensor as required
Clear the code and perform a road test to verify the repair

Gate Select Circuit High: Hidden Causes

A common oversight is a weak or failing battery or charging system that causes voltage spikes, which can set a high-voltage code in the gate select circuit without any actual sensor fault.
The code can be set by a short to voltage in the wiring harness where it rubs against a power wire, often near the steering column or under the center console, and this is frequently missed during visual inspections.
Technicians sometimes replace the gear selector assembly only to find the TCM connector has corroded pins that create a high-resistance path, mimicking a sensor failure.
In some vehicles, the gate select position signal is shared with other functions, so a fault in a related module or a poor ground can cause the TCM to see an abnormally high voltage on this circuit.

Can I keep driving with P0907?

If the vehicle drives normally and the only symptom is the warning light, you can drive to a repair shop, but avoid aggressive acceleration or towing. If the transmission is in limp mode or gear selection is difficult, limit driving to a short distance at low speed to reach a safe location.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.