Code Definition

P0819 — Up and Down Shift Switch to Transmission Range Correlation

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0819

P0819 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0819 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and a correlation fault — two sensors that should track each other have diverged beyond tolerance.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0819 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Fault code P0819 is set when the vehicle's powertrain control module (PCM) or transmission control module (TCM) detects a discrepancy or lack of correlation between the signals from the upshift and downshift switches and the actual transmission gear range. This code is typically found in vehicles with semi-automatic or manual transmissions that provide manual shift capability. The issue arises when the input from the shift switches does not align with the transmission's current gear position, indicating a potential malfunction in the shift control system or a miscommunication between component...

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