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Service bulletin 21-029-14

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 id10139760
Published by NHTSA2018-06-11
Manufacturer's number21-029-14
Manufacturer's date2014-09-30
NHTSA componentPOWER TRAIN; ELECTRICAL SYSTEM

NHTSA's summary

Flash: MIL Illumination For P1DCF, P1DD0, P1DB8 This bulletin involves selectively erasing and reprogramming the Transmission Control Module (TCM) with new software. The following Transmission Control Module (TCM) calibration improvements are available for (KL) Jeep Cherokee. Both engines ((EHB) 3.2L V6 24V VVT and (ED6) 2.4L I4 Multi Air) ? P1DB8 Unintended Torque Applied while in Neutral (set due to erroneous DTC) ? P1DCF TCM Monitoring Processor Performance - Unallowed Park Engagement due to ABS Failure (set due to erroneous DTC). ? P1DD0 TCM Monitoring Processor Performance - Unallowed Park Engagement (set due to erroneous DTC). 2.4L KL (ED6) only ? Shift comfort complaint on 1-2 and 2-3 upshifts when lifting foot off throttle ? P1DCF TCM Monitoring Processor Performance - Unallowed Park Engagement due to ABS Failure (set due to erroneous DTC). ? P1DD0 TCM Monitoring Processor Performance - Unallowed Park Engagement (set due to erroneous DTC). ? Busy shifting from transmission on grades ? Shift busyness at 75 MPH with 7-8 and 8-7 shifts ? Shift comfort complaint on 3-2 and 2-1 coasting downshifts in Sport mode 3.2L KL (EHB) only ? Shift comfort complaints during ESS auto-start and launch The following Transmission Control Module (TCM) calibration improvements are available for (UF) 200. ? P1DB8 Unintended Torque Applied while in Neutral set due to erroneous DTC ? Slow to downshift. Fixed by making 9-7, 7-4, and 6-4 downshifts more available ? Poor shift quality on 1-2 and 2-3 lift-foot upshifts ? Poor shift quality on 4-3 downshift while coasting ? Poor shift quality on 4-3, 3-2, and 2-1 coasting downshifts in Sport mode

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

P1DB8, P1DCF, P1DD0

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
23V3380002023-05-11. STRUCTURE:BODY:HATCHBACK/LIFTGATE; ELECTRICAL SYSTEM:WIRING: REAR COMPARTMENT/TRUNK
20202612020-06-12. Powertrain
20V3430002020-06-11. POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT; POWER TRAIN:AUTOMATIC TRANSMISSION
18V3320002018-05-17. ELECTRICAL SYSTEM:SOFTWARE; VEHICLE SPEED CONTROL:CRUISE CONTROL; ELECTRICAL SYSTEM:WIRING
20163612016-07-13. Powertrain
16V5290002016-07-12. POWER TRAIN:AUTOMATIC TRANSMISSION
15V8260002015-12-09. STRUCTURE:BODY:HATCHBACK/LIFTGATE; ELECTRICAL SYSTEM:WIRING: REAR COMPARTMENT/TRUNK
15V4700002015-07-28. ELECTRICAL SYSTEM
20150692015-02-17. Powertrain
15V0900002015-02-13. 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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S1408000384 REV.I2026-02-19. Service bulletin. Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS Related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On
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.
S2208000138 REV.B2025-07-09. Service bulletin. Decreased Remote Start And RKE Range. Tire Pressure Sensors Values Are Not Displayed
S1408000384 REV.H2025-01-28. Service bulletin. Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS Related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On
S1408000384 REV.G2025-01-09. Service bulletin. Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On
S1408000384 REV.F2024-07-02. Service bulletin. "Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On "
S14080003842024-03-18. Service bulletin. Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On
S23250000072024-01-08. Service bulletin. MIL/check engine lamp comes on after performing U90 recall PCM software update.