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Service bulletin 21-024-19

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 id10162545
Published by NHTSA2019-07-15
Manufacturer's number21-024-19
Manufacturer's date2019-05-09
NHTSA componentPOWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

Flash: Transmission Control Module (TCM) Update This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. Customers may experience the following: Malfunction Indicator Lamp (MIL) illumination, Electronic Vehicle Information Center (EVIC) message states ?Service Transmission? and transmission intermittently goes into neutral with PRNDL flashing when vehicle is stopped. The vehicle may or may not resume normal transmission operation after cycling the shifter or ignition. Customer may notice poor shift quality before engine/trans has reached normal operating temperature.

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

Transmission and driveline, Automatic transmission, Transmission control module

Vehicles listed
JEEP COMPASS2018

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

Other bulletins for the same vehicles and component
18098202022-10-17. Service bulletin. Flash: Powertrain Control Module (PCM) Updates - AN-M4-20200919 Refer to China Joint Venture (JV) released document AN-M4-20200919 for details on this service action.
18-098-202020-11-30. Service bulletin. Flash: Powertrain Control Module (PCM) Updates - AN-M4-20200919 Refer to China Joint Venture (JV) released document AN-M4-20200919 for details on this service action.
18-044-202020-06-22. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience one or more of the following conditions: Intermittent Engine Stop/Start (ESS) operation (Sales Code ECL only). Reduced battery life (Sales Code ECL only). Hard or no start condition (under certain conditions after the fuel tank has been filled with a different fuel type). False low oil pressure lamp illuminated in the cluster. A hard or no start condition when using only E22 fuel. Oil change message was displayed at the wrong time. When Adaptive Cruise Control (ACC) is illuminated, the normal cruise control active message is displayed (Sales Code NHZ). Additional enhancement included in this software: Alternator Smart Charging calibration improvements.
18-080-192019-12-02. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience excessive oil consumption between oil change intervals.
18-072-192019-12-02. Service bulletin. Flash: Powertrain Control Module (PCM) Updates - AN-M4-18-20191010 Refer to China Joint Venture (JV) released document AN-M4-18-20191010, for details on this service action.