P0814 Transmission Range Display Circuit

P0814 points to a transmission range display circuit fault. The selected gear or PRNDL display signal is not matching the controller's expected state.

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 replace the range display or cluster before checking whether the controller is sending valid range data.

Symptoms of P0814

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 P0814

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

Compare scan-tool range data, instrument cluster display, shifter position, and module communication data in every selector position.
Inspect cluster communication, range display wiring, shifter module connectors, grounds, and water intrusion near console electronics.
Check for companion range sensor, communication, or body module codes that can explain a wrong or missing gear display.

Related OBD-II codes

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