P0908 Gate Select Position Circuit Intermittent

P0908 indicates an intermittent gate select position circuit fault. The gate position signal drops out or becomes invalid only during some conditions.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear intermittent gate position faults without reproducing the signal dropout.

Symptoms of P0908

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0908

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Graph gate position data during shifter movement, actuator operation, heat soak, vibration, and harness wiggle testing.
Inspect connector locking, terminal tension, wire flex points, sensor mounting, actuator vibration, and shared reference stability.
Check whether the intermittent signal loss coincides with shift aborts, wrong gear selection, or adaptation errors.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.