Code Definition

P1919 (08) — Engine Coolant Temperature (ECT) Signal Plausibility

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Ford

About P1919

P1919 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1919 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Powertrain Control Module (PCM) continuously monitors the Engine Coolant Temperature (ECT) sensor signal and compares it against expected temperature values based on engine operating conditions, intake air temperature, and elapsed engine run time. DTC P1919:08 is set when the PCM determines that the ECT signal is implausible, meaning the reported coolant temperature does not change as expected or does not correlate with other temperature inputs or engine warm up logic within a calibrated time frame. This indicates a plausibility or rationality failure rather than a hard electrical fault. T...

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