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Service bulletin 18-020-21

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 id10188817
Published by NHTSA2021-03-15
Manufacturer's number18-020-21
Manufacturer's date2021-02-16
NHTSA componentPOWER TRAIN

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 one or more of the following Diagnostic Trouble Codes (DTCs):P2610 - PCM Internal Engine Off Timer 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. C1252 - Vacuum Pump Control Circuit - Performance Or Incorrect Operation. P06DA - Engine Oil Pressure Control Circuit. P06DD - Engine Oil Pressure Control Circuit Stuck Off. P06DE - Engine Oil Pressure Control Circuit Stuck On. B25C7 - Driver Door Ajar Switch 2 Circuit Low. B25C8 - Driver Door Ajar Switch 2 Circuit High. B25C9 - Driver Door Ajar Switch 2 Stuck Closed. B25CB - Driver Door Ajar Switch 1/Driver Door Ajar Switch 2 Correlation. C10D0 - Electronic Park Brake Module Deactivated. P0EA5 - DC/DC Converter 2 Performance. P0EA6 - DC/DC Converter 2 Over Temperature. P2299 - Brake Pedal Position/Accelerator Pedal Position Incompatible. U0128 - Lost Communication With Park Brake Control Module. U0151 - Lost Communication With Occupant Restraint Controller. U0416 - Implausible Data Received From Esp. U0418 - Implausible Data Received From Brake System Control Module 1. U0599 - Invalid Data Received From DC to DC Converter Control Module "A". U0299 - LOC With DC-DC Convertor 2. U1409 - Implausible LF WSS Received. U140A - Implausible RF WSS Received. U059A - Invalid Data Received From DC to DC Converter Control Module "B". C0542 - Brake Pressure Sensor 2 Circuit Low. C0543 - Brake Pressure Sensor 2 Circuit High. P258A - Electric Vacuum Pump Circuit (turn MIL off, switch to 1 trip fault). P0616 - Starter Control Circuit Low. P0617 - Starter Control Circuit High.P0607 - ECU Internal Performance.

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

Trouble codes named

B25C7, B25C8, B25C9, B25CB, C0542, C0543, C10D0, C1252, P0456, P0607, P0616, P0617, P06DA, P06DD, P06DE, P06EF, P0EA5, P0EA6, P2299, P258A, P2610, U0128, U0151, U0299, U0416, U0418, U0599, U059A, U1409, U140A

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
18V7390002018-10-19. POWER TRAIN:AUTOMATIC TRANSMISSION
20184222018-08-09. Powertrain
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
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140822026-04-15. Warranty extension. (XX1) Two Speed Power Transfer Unit (PTU) - Select 2017 - 2019 Jeep Cherokee (KL)
140812026-04-15. Warranty extension. (XX1) Two Speed Power Transfer Unit (PTU) - Select 2017 - 2019 Jeep Cherokee (KL)
140792026-04-15. Warranty extension. (XX1) Two Speed Power Transfer Unit (PTU) - Select 2017 - 2019 Jeep Cherokee (KL)
140782026-04-15. Warranty extension. (XX1) Two Speed Power Transfer Unit (PTU) - Select 2017 - 2019 Jeep Cherokee (KL)
1114472026-04-15. Warranty extension. ID-26-19 (XX1) Two Speed Power Transfer Unit (PTU) - Select 2017 - 2019 Jeep Cherokee (KL)
1114322026-04-15. Warranty extension. D-26-10 (XX1) Two Speed Power Transfer Unit (PTU) - Select 2017 - 2019 Jeep Cherokee (KL)
21-027-26 REV. A2026-04-15. Service bulletin. Two Speed Power Transfer Unit Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ? C1494-07 - PTU Fork Position-Mechanincal Failures. Customers m
21-027-262026-04-15. Service bulletin. Two Speed Power Transfer Unit Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ? C1494-07 - PTU Fork Position-Mechanincal Failures. Customers m
S1721000016 REV.B2025-12-23. Service bulletin. Service 4wd Light On, AWD System Service Required Message Illuminated. Diagnostic Trouble Code (DTC) C14A7-97 PTU Motor Component Or System Operation Obstructed Or Blocked.