P0128 on Ford vehicles The engine is not reaching its normal operating temperature in the expected time — usually the thermostat

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Ford filed with NHTSA whose summary names P0128. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• TSB 19-2046 Service bulletin
  2019-02-21 · Power Train
• Some 2019 Edge/Nautilus vehicles equipped with a 2.0L EcoBoost engine, built on or before 23-Jan-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0128, P0217, P02EE, P02EF, P02F0, P02F1, P044C, P1285, P1299, and/or P2196 stored in the powertrain control module (PCM). This may be due to various settings in the PCM software. To resolve the condit
• TSB 19-2046 Service bulletin
  2019-02-21 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
• Some 2019 Edge/Nautilus vehicles equipped with a 2.0L EcoBoost engine, built on or before 23-Jan-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0128, P0217, P02EE, P02EF, P02F0, P02F1, P044C, P1285, P1299, and/or P2196 stored in the powertrain control module (PCM). This may be due to various settings in the PCM software. To resolve the condit
• SSM 48991 Service bulletin
  2020-07-10 · Engine And Engine Cooling
• Some 2015-2020 F150/Edge/Fusion, 2016-2018 MKX, 2019-2020 Nautilus, and 2017-2020 Continental vehicles equipped with 2.7L EcoBoost engines may exhibit an illuminated malfunction indicator lamp (MIL) and/or Engine Coolant Over Temperature warning with diagnostic trouble codes (DTCs) P0116, P0117, P0118, P0119, P0128, P0217, P0330, P1026, P1299, and/or P130D. This may be due to the engine coolant te
• TSB 25-2348 Service bulletin
  2025-07-25 · Power Train
• Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0128, P0420, and/or P0430 stored in the powertrain control module (PCM). This may be due to the software in the PCM.
• TSB 20-2234 Service bulletin
  2020-07-10 · Engine And Engine Cooling
• Some 2019-2020 Edge/Nautilus vehicles equipped with a 2.0L EcoBoost engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0128, P0217, P044C, P1026, P1285, P1299, P139A and/or P2457 stored in the powertrain control module (PCM). The vehicle may also exhibit low coolant level, white smoke from the tailpipe, an over temperature warning in the instru
• SSM 47751 Service bulletin
  2019-01-17 · Engine
• Some 2018-2019 Fiesta vehicles may exhibit an illuminated MIL with DTC P0128 stored in the powertrain control module (PCM). If the vehicle exhibits this DTC, clear all DTCs and allow the vehicle to sit for a minimum of 3 hours. Then drive the vehicle for at least 16 km (10 miles) and retest for DTCs. If DTC P0128 does not return, do not replace the thermostat valve, release the vehicle at this tim
• TSB 19-2116 Service bulletin
  2019-04-16 · Engine And Engine Cooling
• Some 2016-2019 Fiesta vehicles built on or before 19-Feb-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0128 stored in the powertrain control module (PCM). This may be due to some PCM software parameters related to engine temperature. To resolve the condition, reprogram the PCM.

A stored code names the test that failed, never the part that caused it. The record above is what Ford and its owners have filed about it; the code’s page across every make has the whole file.