P0819
PowertrainTransmission Shiftmoderate severityUp and Down Shift Switch to Transmission Range Correlation
What P0819 Means
The PCM detected a mismatch between the up/down shift switch signals and the transmission range sensor. This indicates the two inputs do not agree with one another.
Symptoms
- Erratic shifting
- Manual mode not working
- Warning light on
Common Causes
- Faulty shift switches
- Faulty transmission range sensor
- Damaged wiring or connector
- Faulty PCM/TCM
Diagnostic Steps
- Scan for related codes
- Compare switch and range sensor data
- Inspect wiring and connectors
- Verify sensor calibration
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