P0071 on the 2017 Ford C-max
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| TSB 17-2072 | 2017-08-01. Service bulletin. Some 2017 C-MAX/Fusion Hybrid/Energi and MKZ Hybrid vehicles may exhibit an illuminated MIL with DTC P0071 stored in the powertrain control module (PCM). This DTC can be set after the vehicle is stored inside 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 Integrated Diagnostic System (IDS) release 104.04 or higher. Make sure you are connected to the internet when entering module programming to obtain the latest updates. Calibration files may also be obtained at www.motorcraftservice.com. |
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| SSM 46410 | 2017-03-20. Service bulletin. SOME 2017 FUSION HEV/PHEV, C-MAX HEV/PHEV, AND MKZ HEV VEHICLES MAY EXHIBIT AN ILLUMINATED MIL WITH DTC P0071 AND/OR DEGRADED HVAC PERFORMANCE IN AUTOMATIC MODE ONLY WITH AN AMBIENT TEMPERATURE READING OF 50 DEGREES F DISPLAYED IN THE MESSAGE CENTER. IF AFTER PERFORMING NORMAL PINPOINT TEST DIAGNOSIS, A COMPONENT FAILURE IS NOT IDENTIFIED, DO NOT CONTINUE WITH FURTHER DIAGNOSIS OR PART REPLACEMENT. HAVING THE VEHICLE PARKED AND STARTED IN A WARM ENCLOSED AREA BEFORE BEING DRIVEN INTO COLD TEMPERATURES CAN INADVERTENTLY CAUSE THESE SYMPTOMS AND DTC. THE HVAC AND MESSAGE CENTER FUNCTIONS WILL RETURN TO NORMAL AFTER THE VEHICLE IS SHUT DOWN AND RESTARTED. CLEAR THE DTC USING THE FORD INTEGRATED DIAGNOSTIC TOOL (IDS) OR EQUIVALENT. ENGINEERING IS INVESTIGATING. MONITOR OASIS FOR UPDATES. |
| SSM 46285 | 2017-03-13. Service bulletin. SOME 2017 FUSION HEV/PHEV, C-MAX HEV/PHEV, AND MKZ HEV VEHICLES MAY EXHIBIT AN ILLUMINATED MIL WITH DTC P0071 AND/OR DEGRADED HVAC PERFORMANCE IN AUTOMATIC MODE ONLY WITH AN AMBIENT TEMPERATURE READING OF 50 DEGREES F DISPLAYED IN THE MESSAGE CENTER. IF AFTER PERFORMING NORMAL PINPOINT TEST DIAGNOSIS, A COMPONENT FAILURE IS NOT IDENTIFIED, DO NOT CONTINUE WITH FURTHER DIAGNOSIS OR PART REPLACEMENT. HAVING THE VEHICLE PARKED AND STARTED IN A WARM ENCLOSED AREA BEFORE BEING DRIVEN INTO COLD TEMPERATURES CAN INADVERTENTLY CAUSE THESE SYMPTOMS AND DTC. THE HVAC AND MESSAGE CENTER FUNCTIONS WILL RETURN TO NORMAL AFTER THE VEHICLE IS SHUT DOWN AND RESTARTED. CLEAR THE DTC USING THE FORD INTEGRATED DIAGNOSTIC TOOL (IDS) OR EQUIVALENT. ENGINEERING IS INVESTIGATING. MONITOR OASIS FOR UPDATES. |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.