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Service bulletin 21-021-15

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 id10144860
Published by NHTSA2018-09-24
Manufacturer's number21-021-15
Manufacturer's date2015-03-28
NHTSA componentPOWER TRAIN; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

NHTSA's summary

Flash: Transmission Diagnostic And Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with new software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination on vehicles equipped with a 948TE 9 speed automatic transmission (sales code DFH or DFJ). Upon further investigation, a technician may find Diagnostic Trouble Code (DTC) P1DAD - Input Shaft-Output Shaft Direction Correlation stored in the TCM memory. In addition to addressing the above DTC, this TCM calibration update is being released to enable the new wiTECH based ?Transmission Quick Learn? procedure to be performed anytime the transmission adaptation memory cells are cleared or when addressing customer concerns of poor shift quality. It is also being released to improve transmission downshift response time during normal driving.

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

Equipment and accessories, Labels and manuals, Transmission and driveline

Trouble codes named

P1DAD

Vehicles listed
CHRYSLER 2002015
JEEP CHEROKEE2015

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

Recalls for the same vehicles and component
20245482024-08-15. Label
20202612020-06-12. Powertrain
20V3430002020-06-11. POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT; POWER TRAIN:AUTOMATIC TRANSMISSION
20176632017-12-22. Accessories
17V8240002017-12-21. EQUIPMENT
20163612016-07-13. Powertrain
16V5290002016-07-12. POWER TRAIN:AUTOMATIC TRANSMISSION
20155882015-12-09. Accessories
15V4610002015-07-23. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.
20152712015-06-17. Accessories

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
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.
21-040-252025-10-08. Service bulletin. 948TE Transmission Reaction Shaft Service Bushing Kit Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code (DTC): ● P1DB7-00 - Torque Converter Clutch Performance.
S23250000072024-01-08. Service bulletin. MIL/check engine lamp comes on after performing U90 recall PCM software update.
S23250000072023-10-30. Service bulletin. MIL/check engine lamp comes on after performing U90 recall PCM software update.
931202023-10-02. Service bulletin. FCA Caribbean Warranty Bulletin ID-23-20 "Can / Am" Warranty Coverage - 594 / 595 / 596 WCC
930232023-10-02. Service bulletin. Warranty Bulletin D-16-03 - "Can / Am" Warranty Coverage - 594 / 595 / 596 WCC (Rev. B)
91001962023-09-25. Service bulletin. Lubrication and Maintenance Fluids If MOPAR fluids and chemicals are not readily available, please review Service Library for specifications so a suitable alternative can be used
21014232023-08-21. Service bulletin. Power Transfer Unit (PTU) Broken Input Spline XJ1 Warranty Extension Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ? P1720-00 - Output Speed Sensor Wheel Speed Rationality. ? P215C-00 - Output Shaft Speed Wheel Speed Correlation. This bulletin involves replacing the PTU assembly with an updated part.
914902023-08-21. Service bulletin. FCA Caribbean Warranty Bulletin ID-23-11 (XJ1) Power Transfer Unit (PTU) - Select 2014 - 2017 Jeep Cherokee (KL)
914862023-08-21. Service bulletin. Warranty Bulletin D-23-10 (XJ1) Power Transfer Unit (PTU) - Select 2014 - 2017 Jeep Cherokee (KL)