P0819 Up and Down Shift Switch to Transmission Range Correlation

P0819 indicates a correlation fault between up/down shift switch inputs and transmission range. The manual shift request does not agree with selector 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 paddle or shifter switches until range data and manual-mode correlation are checked together.

Symptoms of P0819

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 P0819

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 upshift and downshift switch data, transmission range data, manual-mode status, and gear display while moving the shifter.
Inspect shifter assembly wiring, range sensor adjustment, switch contacts, connector fit, and console water intrusion.
Check whether the issue appears only in manual gate, sport mode, one selector position, or during shifter movement.

Related OBD-II codes

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