P0128 · Comunicaciones del fabricante

HYUNDAI · 2026-10-09

Certain Santa Fe Hybrid (TM HEV), Santa Fe Plug-in Hybrid (TM PHEV), Tucson Hybrid (NX4 HEV), andTucson Plug-in Hybrid (NX4 PHEV) vehicles may experience intake air line freezing and Exhaust GasRecirculation (EGR) valve corrosion due to excessive condensation accumulating within the EGR system.This condition can lead to drivability concerns related to the following DTCs: - P040400: (Exhaust Gas Recirculation Control Circuit Range) - P049D00: (EGR 'A' Control Position Exceeded Learning Limit) - P047100: (Exhaust Pressure Sensor 'A' Circuit Range/Performance) - P012800: Coolant Thermostat (Coolant Temperature below Thermostat Regulation Temperature) - P262B00: (Control Module Power Off Timer Performance) - P050C00: Cold Start Engine Coolant Temperature Performance - P1DFD00: (EVAP System…

HYUNDAI · 2026-10-08

Certain Santa Fe Hybrid (TM HEV), Santa Fe Plug-in Hybrid (TM PHEV), Tucson Hybrid (NX4 HEV), and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may experience intake air line freezing and Exhaust Gas Recirculation (EGR) valve corrosion due to excessive condensation accumulating within the EGR system. This condition can lead to drivability concerns related to the following DTCs: • P040400: (Exhaust Gas Recirculation Control Circuit Range) • P049D00: (EGR 'A' Control Position Exceeded Learning Limit) • P047100: (Exhaust Pressure Sensor 'A' Circuit Range/Performance) • P012800: Coolant Thermostat (Coolant Temperature below Thermostat Regulation Temperature) • P262B00: (Control Module Power Off Timer Performance) • P050C00: Cold Start Engine Coolant Temperature Performance • P1DFD00: (EVAP System…

HYUNDAI · 2026-10-08

Certain Santa Fe Hybrid (TM HEV), Santa Fe Plug-in Hybrid (TM PHEV), Tucson Hybrid (NX4 HEV), and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may experience intake air line freezing and Exhaust Gas Recirculation (EGR) valve corrosion due to excessive condensation accumulating within the EGR system. This condition can lead to drivability concerns related to the following DTCs: • P040400: (Exhaust Gas Recirculation Control Circuit Range) • P049D00: (EGR 'A' Control Position Exceeded Learning Limit) • P047100: (Exhaust Pressure Sensor 'A' Circuit Range/Performance) • P012800: Coolant Thermostat (Coolant Temperature below Thermostat Regulation Temperature) • P262B00: (Control Module Power Off Timer Performance) • P050C00: Cold Start Engine Coolant Temperature Performance • P1DFD00: (EVAP System…

SUBARU · 2026-08-31

This bulletin announces the availability of new reprograming files for the Engine Control Module (ECM) developed to remedy the following DTCs: P0016, P0017, P0018, P0019, P0014, P0024, P0128, P2109. If any of the DTCs listed above are found to be stored in the ECM, follow the procedures outlined in the bulletin. This is an revised version of the original bulletin.

MITSUBISHI · 2026-08-19

This Service Campaign Bulletin sent to dealers provides instructions to reflash the ECU to address fault codes P0128-00, P2096-00 and P050A.

MITSUBISHI · 2026-07-31

This Service Campaign Bulletin sent to dealers provides instructions to reflash the ECU to address fault codes P0128-00, P2096-00 and P050A.

MERCEDES-BENZ, MERCEDES-MAYBACH · 2026-07-24

Complaint Check Engine Light ON with DTC P012800 "The Coolant Temperature is Below the Specified Temperature" active and/or stored in the ME (N3/10). There are no drivability concerns related to this complaint. Cause Root cause varies Remedy Prior to performing any repairs for this complaint: With a cold engine, pressurize the high temp coolant circuit and while it's under pressure, release the cap on the low temp coolant circuit and check if the pressure drops right away or not. If the pressure drops, the lower coolant hoses are swapped. Correct this, fill, bleed and test drive the vehicle. If the complaint returns, then continue with the steps below. IMPORTANT: Use VMI to check for the following emission extended warranty –> Engine Thermostat (incl. software update) MY19-23, Various…

MITSUBISHI · 2026-07-07

This Service Campaign Bulletin sent to dealers provides instructions to reflash the ECU to address fault code P0128-00, and effective 6/26/2026, fault codes P2096-00 and P050A as well.

MITSUBISHI · 2026-06-25

This revised Technical Service Bulletin sent to dealers provides instructions to reflash the Engine Control Unit with updated software when a diagnostic code of P0128-00 is found.

MITSUBISHI · 2026-05-22

This revised Technical Service Bulletin sent to dealers provides instructions to reflash the Engine Control Unit with updated software when a diagnostic code of P0128-00 is found.

MERCEDES-BENZ, MERCEDES-MAYBACH · 2026-04-21

Complaint CEL ON with DTC P012800 "The Coolant Temperature is Below the Specified Temperature" active and stored in the ME (N3/10). There are no drivability concerns related to the complaint. Cause Root cause varies Remedy Prior to performing any repairs for this complaint: With a cold engine, pressurize the high temp coolant circuit and while it's under pressure, release the cap on the low temp coolant circuit and check if the pressure drops right away or not. If the pressure drops, the lower hoses are swapped. Correct this, fill, bleed and test drive the vehicle. If the complaint returns, then continue with the steps below. IMPORTANT: Use VMI to check for emission extended warranty – Engine Thermostat (incl. software update) MY19-23, Various Models and Platforms (167, 190, 205, 213,…

MITSUBISHI · 2026-04-06

This revised Technical Service Bulletin provides guidance when the check engine light is on with P0128-00 stored in the Engine ECU.

MITSUBISHI · 2026-03-20

This Warranty Bulletin provides instructions on submiting a warranty claim when the check engine light is on with either P2096-00 or P0128-00 stored in the Engine ECU.

MITSUBISHI · 2026-03-20

This Technical Service Bulletin provides guidance when the check engine light is on with P0128-00 stored in the Engine ECU.

RAM · 2026-03-07

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P208B-00 - Reductant Pump 1 Control Performance. ● P0128-00 - Thermostat Rationality. This bulletin involves reprogramming the PCM with the latest available software.

RAM · 2026-03-07

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P208B-00 - Reductant Pump 1 Control Performance. ● P0128-00 - Thermostat Rationality. This bulletin involves reprogramming the PCM with the latest available software.

VOLVO · 2026-02-21

This is a Technical Journal: MIL and DTCs ECM P012807/P01287A. In case of MIL and DTCs P012807 and P01287A set together, follow advice under "Service". A software solution was released in version 3.4.4

RAM · 2026-02-18

Flash: Powertrain Control Module (PCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0128-00 - Thermostat Rationality. ● P24A4-00 - Particulate Filter Restriction - Soot Accumulation Too High. ● P208B-00 - Reductant Pump 1 Control Performance.** Customers may experience one or more of the following: ● Lower than expected fuel economy when vehicle is lightly loaded, operating in stop and go traffic and at lower speeds. ● Long cranking / extended starting times. **Other software enhancement included with this update: ● "Air Handling Performance Test" is now available to help troubleshoot air handling DTCs.** This bulletin involves reprogramming the…

RAM · 2026-02-18

Flash: Powertrain Control Module (PCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0128-00 - Thermostat Rationality. ● P24A4-00 - Particulate Filter Restriction - Soot Accumulation Too High. ● P208B-00 - Reductant Pump 1 Control Performance.** Customers may experience one or more of the following: ● Lower than expected fuel economy when vehicle is lightly loaded, operating in stop and go traffic and at lower speeds. ● Long cranking / extended starting times. **Other software enhancement included with this update: ● "Air Handling Performance Test" is now available to help troubleshoot air handling DTCs.** This bulletin involves reprogramming the…

MERCEDES-BENZ, MERCEDES-MAYBACH · 2026-02-11

Complaint CEL on with Code P012800 "The Coolant Temperature is Below the Specified Temperature" Cause Under investigation. This is not an issue that affects drivability or performance and is not a safety concern. The vehicle remains safe to operate with this code, but the measures listed in the "Remedy" section are recommended. Remedy 1. Use VMI to check for Emission Extended Warranty – Engine Thermostat (incl. software update) MY19-23, Various Models and Platforms (167, 190, 205, 213, 217, 222, 223, 232, 253, 290, 463) 2. If the vehicle is covered under the Emission Extended Warranty, Please perform steps outlined in the NCU for repairs. 3. If vehicle does not fall into the covered area of the Extended Warranty please check for Software updates to the ME control unit and then proceed…

VOLVO · 2026-02-05

This is a Technical Journal: MIL and DTCs ECM P012807/P01287A. In case of MIL and DTCs P012807 and P01287A set together, follow advice under "Service". A software solution was released in version 3.4.4

MERCEDES-BENZ, MERCEDES-MAYBACH · 2026-01-06

Complaint CEL on with Code P012800 "The Coolant Temperature is Below the Specified Temperature" Cause Under investigation. This is not an issue that affects drivability or performance and is not a safety concern. The vehicle remains safe to operate with this code, but the measures listed in the "Remedy" section are recommended. Remedy 1. Use VMI to check for Emission Extended Warranty – Engine Thermostat (incl. software update) MY19-23, Various Models and Platforms (167, 190, 205, 213, 217, 222, 223, 232, 253, 290, 463) 2. If the vehicle is covered under the Emission Extended Warranty, Please perform steps outlined in the NCU for repairs. 3. If vehicle does not fall into the covered area of the Extended Warranty please proceed with "Remedy Instructions" in attachments. Due to formatting…

MERCEDES-BENZ · 2025-10-28

Complaint Check engine lamp illuminated. Fault code stored P012800-The coolant temperature is below the coolant thermostat specified temperature. Cause Various possible causes Remedy 1- Update HVAC with latest software 2- Perform guided test for fault P012800 and performed repairs per XENTRY diagnosis. - If thermostat requires replacement flush cooling circuit in both directions with 150L of water. MY 2020 GLC350e 253.953 only 3- Update the software of engine control unit N3/10. New version A2749022102 A2749032506. Note- If the guided test passes no repair should be performed. SW update for remaining hybrid models is in development for ME control unit to resolve this fault.

FORD · 2025-10-17

Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0128 stored in the powertrain control module (PCM). This may be due to the software in the PCM.

MERCEDES-BENZ · 2025-10-13

Complaint Customer states that the CEL is lit in the instrument cluster. Various codes may be active/stored: Stored in N3/10 in model series 206, 254 or 232: P012800 - The coolant temperature is below the coolant thermostat specified temperature. and/or P01169D - Malfunction in coolant temperature sensor 1. Under temperature in the component or system. For model series 177, 118, 247 in n3/10 (only valid for M139.980 facelift (code 9U8)): P2CEF00 - Electrical fault or open circuit in coolant thermostat. and/or P011685 - Malfunction in coolant temperature sensor 1. There is a signal above the permissible limit. Cause Debris in the coolant system Remedy An updated thermostat must be installed. Order the correct thermostat part number for your application: CLA45/GLA45 with SA Code 9U8: A 139…

RAM · 2025-08-23

Flash: Powertrain Control Module (PCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P245D-00 - EGR Cooler Bypass Control Circuit High. ● P02E3-00 - Diesel Intake Air Flow Control Circuit High. ● P0490-00 - EGR Control Circuit High. ● P229F-00 - Aftertreatment NOX Sensor Circuit Performance - Bank 1 Sensor 2. ● P0299-00 - Turbocharger Underboost. ● P242F-00 - Diesel Particulate Filter Restriction - Ash Accumulation. ● P0128-00 - Thermostat Rationality. ● P0234-00 - Turbocharger Overboost Condition.** Customers may also comment on one or more of the following: ● **Engine speed unstable when vehicle is stationary, not in gear and running on high speed…

RAM · 2025-08-23

Flash: Powertrain Control Module (PCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P245D-00 - EGR Cooler Bypass Control Circuit High. ● P02E3-00 - Diesel Intake Air Flow Control Circuit High. ● P0490-00 - EGR Control Circuit High. ● P229F-00 - Aftertreatment NOX Sensor Circuit Performance - Bank 1 Sensor 2. ● P0299-00 - Turbocharger Underboost. ● P242F-00 - Diesel Particulate Filter Restriction - Ash Accumulation. ● P0128-00 - Thermostat Rationality. ● P0234-00 - Turbocharger Overboost Condition.** Customers may also comment on one or more of the following: ● **Engine speed unstable when vehicle is stationary, not in gear and running on high speed…

RAM · 2025-08-23

Flash: Powertrain Control Module (PCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P245D-00 - EGR Cooler Bypass Control Circuit High. ● P02E3-00 - Diesel Intake Air Flow Control Circuit High. ● P0490-00 - EGR Control Circuit High. ● P229F-00 - Aftertreatment NOX Sensor Circuit Performance - Bank 1 Sensor 2. ● P0299-00 - Turbocharger Underboost. ● P242F-00 - Diesel Particulate Filter Restriction - Ash Accumulation. ● P0128-00 - Thermostat Rationality. ● P0234-00 - Turbocharger Overboost Condition.** Customers may also comment on one or more of the following: ● **Engine speed unstable when vehicle is stationary, not in gear and running on high speed…

FORD · 2025-07-25

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.

RAM · 2025-07-04

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0420 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430 - Catalyst System Efficiency Below Threshold Bank 2. ● P0456 - EVAP System Small Leak. ● P06EF - Engine Restart Performance. ● P0175 - Fuel System 2/1 Rich. ● P258B - Electronic Vacuum Pump Performance. ● P0128 - Thermostat Rationality. ● C0062 - Longitudinal Acceleration Sensor. In addition, the customer may experience one or more of the following: ● Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness. ● Engine RPM erratic and or bucking, when accelerating after slowing down. ●…