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Service bulletin 18-023-20

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)
TypeService bulletin
NHTSA id10174235
Published by NHTSA2020-04-27
Manufacturer's number18-023-20
Manufacturer's date2020-03-19
NHTSA componentPOWER TRAIN; ELECTRICAL SYSTEM

NHTSA's summary

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes (DTCs) have been set:P0780 - Gear Shift Malfunction. P050B - Cold Start Ignition Timing Performance. P06EF - Engine Restart Performance. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to determine if a leak is present in the system. Customers may also comment on one or more of the following:Extended engine crank times or possibly a no start condition(South Korea with Sales Code EDD only). The engine fails to restart while in Engine Stop/Start (ESS) mode. This is usually accompanied withDTC P06EF.

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, Transmission and driveline

Trouble codes named

P0456, P050B, P06EF, P0780

Vehicles listed
JEEP CHEROKEE2019

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

Recalls for the same vehicles and component
20262242026-05-07. Powertrain
26V2900002026-05-07. POWER TRAIN
20250122025-01-16. Powertrain
25V0110002025-01-16. POWER TRAIN
18V9170002018-12-20. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
18V7390002018-10-19. POWER TRAIN:AUTOMATIC TRANSMISSION
20184222018-08-09. Powertrain
18V5240002018-08-09. ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD
18V4920002018-07-26. POWER TRAIN:AUTOMATIC TRANSMISSION

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
03-002-262026-07-18. Service bulletin. Stop/Start Illuminated, 0x22 During Fork Wear Routine Technicians may experience the following: SYMPTOM: ● Negative response 0X22 after Recall 01C flash triggers one or more communication codes with controllers.
03-001-262026-07-18. Service bulletin. Unable to Complete 01C Recall Drive Cycle C14A7-97 Active Technicians may experience the following: SYMPTOM: ● After performing Recall 01C, the vehicle may get a 'Service AWD' message on the EVIC.
S2523000003 REV.A2026-04-29. Service bulletin. Door Latch, Handle And Ajar Additional Service Information.
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