Service bulletin 18-052-26

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	11032840
Published by NHTSA	2026-05-20
Manufacturer's number	18-052-26
Manufacturer's date	2026-05-12
NHTSA component	ELECTRICAL SYSTEM

NHTSA's summary

Flash: Powertrain Control Module (PCM) Updates - PCR8A3 Technicians may find the following Diagnostic Trouble Code (DTC): ● P04B6-00 - Fuel Fill Door Stuck Closed (Stored Status). NOTE: There will be no Malfunction Indicator Lamp (MIL) for this DTC. Customers may also experience one or more of the following: ● The vehicle will not start and cannot be keyed off. NOTE: The vehicles 12V system remains powered up. ● Poor combustion stability or "wavy" engine RPM oscillations during engine warm-ups. ● Engine Stop/Start (ESS) bumps or lack of refinement. ● Noisy/poor starts in extreme cold temperatures. ● Perceived after-run pump noise after vehicle is turned off. The following software enhancements are also available: ● Diagnostic improvements for DTCs, P013A-00, P013B-00, P013E-00 and P013F-00. ● Improved transitions between engine operating modes for emissions robustness. ● Scan tool improvement to show accurate state of after-run pump. ● Scan tool improvements for EVAP system data. ● Improved combustion stability during warm-up and catalyst-reheating mode. ● Improved ESS refinements. ● Optimization of after-run pump usage for lower 12V usage and perceived customer noise. ● Disablement of DTC P04B6-00 for falsely setting. ● Calibration update for EVAP system Service Leak Test. ● Improved engine starts at extreme low temperatures. This bulletin involves inspecting and possibly reprogramming the Battery Pack Control Module (BPCM), Drive Motor Power Inverter (DMPI), Electric Vehicle Control Unit (EVCU) and PCM with the latest available software.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system

Trouble codes named

P013A, P013B, P013E, P013F, P04B6

Vehicles listed
JEEP CHEROKEE	2026

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
2026043	2026-02-02. Electrical
26V059000	2026-02-02. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL; EXTERIOR LIGHTING:TURN SIGNAL; EXTERIOR LIGHTING:BRAKE LIGHTS

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
S2608000037	2026-10-16. Service bulletin. Negative Response 0X33 - Security Access Denied When Flashing BPCM With WiTech
S2608000037	2026-10-16. Service bulletin. Negative Response 0X33 - Security Access Denied When Flashing BPCM With WiTech
S2623000056	2026-10-07. Service bulletin. The Door Latch Module Has Active Faults With No Warning Indicators In Cluster
08-332-26 REV. B	2026-09-23. Service bulletin. Hybrid Cooling Pump Emergency Mode Condition Customers may comment on one or more of the following: SYMPTOM: ● 12V battery is draining. NOTE: The auxiliary heat and battery coolant pumps can enter emergency mode and drain the 12V battery. ● A pump running at full speed noise may be heard from the engine compartment after the vehicle is turned off. This bulletin involves replacing the Auxiliary Heat Pump (AHP).
08-178-26 REV. A	2026-09-17. Service bulletin. Flash: Power Liftgate Module (PLGM) Update Customers may comment on one or more of the following: ● The power liftgate chime remains active continuously and does not stop after the liftgate is closed or after an ignition cycle. ● The vehicle will not start due to a discharged battery. NOTE: Battery discharge caused by a continuously active liftgate chime or liftgate remaining open for an extended period. The following PLGM software enhancements are available with this software release: ● New Diagnostic Trouble Codes (DTCs) have been added to the PLGM to report out-of-range ambient temperature and the PLGM being left in plant mode. This bulletin involves reprogramming the PLGM with the latest software.
S2623000052 REV. A	2026-09-10. Service bulletin. Airbag Warning Light On or Intermittent. The Occupant Restraint Controller (ORC) May Have The Following DTCs (Active/Stored)
08-326-26 REV. A	2026-09-03. Service bulletin. Malfunction Indicator Illuminated (MIL) - P04DF-00 Has Set Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ● P04DF-00 - Evap System Purge Control Valve 1 Performance/Stuck Open.
08-326-26	2026-09-03. Service bulletin. Malfunction Indicator Illuminated (MIL) - P04DF-00 Has Set Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ● P04DF-00 - Evap System Purge Control Valve 1 Performance/Stuck Open.
23-034-26	2026-08-19. Service bulletin. Door Latch 12V Battery Drain Customers must experience the following: SYMPTOM: ● The 12v battery is depleted. NOTE: Battery depletion is due to a door latch module issue. This bulletin involves replacing both front door and both rear door latch modules.
9100880	2026-08-13. Service bulletin. Cluster Assembly When the technician connects to the vehicle via Witech, they observe Stored and/or Pending DTC in the IPC for KM49, LB, KM74 Programs. The instrument cluster should not be replaced based solely on the presence of stored or pending DTCs in the IPC. Replacement should only be considered if the stored or pending DTC becomes active during the troubleshooting and diagnostic process.