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)
Type	Service bulletin
NHTSA id	10175568
Published by NHTSA	2020-05-26
Manufacturer's number	18-023-20
Manufacturer's date	2020-03-19
NHTSA component	EXTERIOR LIGHTING; ENGINE AND ENGINE COOLING; 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, Engine, Lighting

Trouble codes named

P0456, P050B, P06EF, P0780

Vehicles listed
JEEP CHEROKEE	2019

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

Recalls for the same vehicles and component
18V917000	2018-12-20. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
2018573	2018-10-19. Engine
18V524000	2018-08-09. ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD
2018282	2018-05-25. Engine
18V344000	2018-05-25. ENGINE AND ENGINE COOLING:ENGINE

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
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08-075-26	2026-03-05. Service bulletin. Rear Taillamp Condensation Clearing Procedure On occasion, vehicle exterior taillamp assemblies get fogged with a light layer of condensation on the SYMPTOM: inside of the lenses Fig. 1. This may be reported after the lamps have been turned on and brought up to operating temperature, turned off and then rapidly cooled by cold water (such as rain, or the water from a vehicle wash). Lens fogging can also occur under certain atmospheric conditions after a vehicle has been parked outside overnight (i.e. a warm humid day followed by clear cool night). This will usually clear as atmospheric conditions change to allow the condensation to change back into a vapor. Turning the taillamps on will usually accelerate this process. This bulletin is to communicate the procedure for rear taillamp condensation clearing.
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