P04B5 · Manufacturer communications

JEEP · 2025-08-30

Flash: Hybrid Control Processor (HCP) and Auxiliary Hybrid Control Processor (AHCP) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle mustexhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0BBD - Hybrid Battery Pack Voltage Variation Exceeded Limit. ● P0B24 - Hybrid Battery 'A' Voltage Unstable. ● P1CEA - Boost Side Evap Purge System Performance ● P04B5 - Fuel Fill Door Stuck Open. Customers may experience one or more of the following: ● Vehicle Will Not start/shift out of park. ● Service Charging System message. ● Battery degradation. ● Reduced fuel efficiency. ● Rough idling or engine misfires. ● Inconsistent or erratic performance. ● Warning lights on the dashboard (e.g., hybrid system warning light). This…

JEEP · 2025-08-30

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): ● P0BBD - Hybrid Battery Pack Voltage Variation Exceeded Limit. ● P0B24 - Hybrid Battery 'A' Voltage Unstable. ● P1CEA - Boost Side Evap Purge System Performance. ● P04B5 - Fuel Fill Door Stuck Open. Customers may comment on one or more of the following: ● Reduced fuel efficiency. ● Rough idling or engine misfires. ● Inconsistent or erratic performance. ● Warning lights on the Instrument Panel Cluster (IPC) (e.g. hybrid system warning light) *This bulletin involves inspecting the PCM software level and possibly reprogramming the PCM with the latest available software.*

JEEP · 2025-07-19

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle mustexhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P04B5 - Fuel Fill Door Stuck Open. ● P1D83 - Implausible Engine Oil Temperature Signal Received.** ● P2450 - Fuel Tank Isolation Valve Stuck Open. ● P0032 - O2 Sensor 1/1 Heater Circuit High. ● P2097 - Downstream Fuel Trim System 1 Rich. ● P0171 - Fuel System 1/1 Lean. ● P0300 - Multiple Cylinder Misfire. ● P06E4 - Control Module Wake-Up Circuit Performance. ● B12B4 - Charge Status Indicator Module Internal. ● P061B - Internal Control Module Torque Calculation Performance. ● P0810 - Clutch Position Control Error. ● P2885 - Engine Disconnect Clutch Engagement Fault.…

JEEP · 2025-07-11

Flash: Hybrid Control Processor (HCP) and Auxiliary Hybrid Control Processor (AHCP) 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): ● P0BBD - Hybrid Battery Pack Voltage Variation Exceeded Limit. ● P0B24 - Hybrid Battery 'A' Voltage Unstable. ● P1CEA - Boost Side Evap Purge System Performance ● P04B5 - Fuel Fill Door Stuck Open. Customers may experience one or more of the following: ● Vehicle Will Not start/shift out of park. ● Service Charging System message. ● Battery degradation. ● Reduced fuel efficiency. ● Rough idling or engine misfires. ● Inconsistent or erratic performance. ● Warning lights on the dashboard (e.g., hybrid system warning light) This…

FORD · 2021-06-15

Some 2021 F-150 PowerBoost vehicles may exhibit the fuel door release tappet separated from the fuel door housing, slow fuel fill, fuel spit back during refueling, a message in the cluster that states Close Fuel Door To Avoid Check Engine Light and/or diagnostic trouble code (DTC) P04B5 stored in the powertrain control module (PCM). This may be due to opening the fuel door without pressing the fuel door release button. Prior to following normal diagnostics, first check that the fuel door release tappet is properly installed into the fuel door and that the fuel door closes properly and opens when using the fuel door release button. If the tappet has separated from the fuel door press the fuel door release button to eject the tappet from the latch then reinstall the tappet into the fuel…

FORD, LINCOLN · 2019-01-24

Some 2013-2018 C-MAX, 2013-2019 Fusion Energi, and 2017-2019 Fusion/MKZ Hybrid vehicles may exhibit an illuminated MIL with diagnostic trouble code (DTC) P04B5. This may be due to inadvertent actuation of the fuel door release button by the customer when exiting the vehicle. If the fuel filler door is not fully closed after a refueling event or the fuel filler door is open from erroneously pressing the fuel door release button, a message displays during the third drive cycle to indicate the fuel filler door is not closed and the DTC sets. Before performing Workshop Manual (WSM) diagnosis, consult the customer about the potential for accidental fuel door actuation and explain the need to fully latch the fuel door after every refueling event. Malfunction Indicator Lamp will turn off after…

LINCOLN · 2019-01-08

Some 2017-2019 MKZ vehicles equipped with a 2.0 HEV engine may exhibit a fuel filler door unable to be opened or closed with or without an illuminated malfunction indicator (MIL) and DTC P04B5. This may occur when the fuel door is pressed or obstructed while the fuel door release latch is operating. If the fuel filler door is unable to be closed, a message displays during the third drive cycle and the DTC P04B5 will set. Before performing Workshop Manual (WSM) diagnosis, reset the system by pressing the fuel filler door release switch and wait 12 seconds for reset. The fuel door release latch should be heard when the motor is in motion. Review fuel filler door for locking tab operation. If the fuel filler door is operating properly, it should not be replaced. Advise the customer about the…

FORD, LINCOLN · 2017-03-14

SOME 2013-2017 C-MAX/FUSION ENERGI AND 2017 C-MAX/FUSION/MKZ HYBRID VEHICLES MAY EXHIBIT AN ILLUMINATED MIL WITH DIAGNOSTIC TROUBLE CODE (DTC) P04B5. THIS MAY BE DUE TO INADVERTENT ACTUATION OF THE FUEL DOOR RELEASE BUTTON BY THE CUSTOMER WHEN EXITING THE VEHICLE. IF THE FUEL FILLER DOOR IS NOT FULLY CLOSED AFTER A REFUELING EVENT, OR THE FUEL FILLER DOOR IS OPEN FROM ERRONEOUSLY PRESSING THE FUEL DOOR RELEASE BUTTON, A MESSAGE DISPLAYS DURING THE THIRD DRIVE CYCLE TO INDICATE THE FUEL FILLER DOOR IS NOT CLOSED AND THE DTC SETS. BEFORE PERFORMING WORKSHOP MANUAL DIAGNOSTICS, CONSULT THE CUSTOMER ABOUT THE POTENTIAL FOR ACCIDENTAL FUEL DOOR ACTUATION AND EXPLAIN THE NEED TO FULLY LATCH THE FUEL DOOR AFTER EVERY REFUELING EVENT.