OBD Code P0781

1-2 Shift

What’s mean?

OBD2 Code P0781 Definition:
This P0781 code indicates that the 1-2 shift valve in the valve body is locked in the direction of the spring compression. The Transmission Control Module (TCM) controls the gearshifts by turning the shift solenoid valves “ON/OFF” and switching oil pressure to the valves in the valve body. The TCM calculates the “actual” transmission gear by comparing the signals from the input speed sensor and the output speed sensor.

Symptoms

Possible sumptoms of P0781
– Engine Light ON (or Service Engine Soon Warning Light) – Transmission may not shift to the next gear.

Possible Causes

Possible causes of P0781
– Low transmission fluid level – Dirty transmission fluid – Faulty shifting solenoid valve – Shifting solenoid valve harness or connectors – Shifting solenoid valve circuit is open or shorted The Error code is generally activated on detection of the following conditions: The P0781 code is detected when actual gear position and the commanded gear position are different

Possible Solutions