Ford PCM Acts Up in Cold Weather

July 19, 2023
Some 2017 Ford C-MAX/Fusion Hybrid/Energi vehicles may exhibit an illuminated MIL with DTC P0071 stored in the PCM. This DTC can be set after the vehicle is stored in a warm location for several hours and then driven on a cold day.

Some 2017 Ford C-MAX/Fusion Hybrid/Energi vehicles may exhibit an illuminated MIL with DTC P0071 stored in the PCM. This DTC can be set after the vehicle is stored in a warm location for several hours and then driven on a cold day. Under these conditions the PCM may see a temperature sensor concern when it first compares the ambient air temperature (AAT) sensor to other engine temperature sensors and set the DTC.

Reprogram the PCM to the latest calibration using IDS release 104.04 or higher.

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