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Service bulletin 08-289-26 REV. A

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 id11035971
Published by NHTSA2026-08-06
Manufacturer's number08-289-26 REV. A
Manufacturer's date2026-07-30
NHTSA componentPOWER TRAIN

NHTSA's summary

Transmission Control Module (TCM) Diagnostic N/A - This bulletin was released in error. SYMPTOM:

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

Vehicles listed
DODGE CHARGER2026
DODGE CHARGER EV2026 (the catalog's model; the bulletin names a series or trim of it)
JEEP GRAND CHEROKEE2026
JEEP GRAND CHEROKEE 4XE2026 (the catalog's model; the bulletin names a series or trim of it)
JEEP GRAND CHEROKEE L2026
JEEP GRAND WAGONEER2026
JEEP WAGONEER2026

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
S26210000042026-10-07. Service bulletin. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines (850RE Transmission Only)
21-020-26 REV. E2026-10-07. Service bulletin. Flash: Transmission Control Module (TCM) Updates PCR9A Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ● P1625-00 - Park Pawl System Failure. NOTE: The above DTCs are being falsely set due to lack of robustness to the diagnostic monitor. Customers may also comment on one or more the following: ● **Slow downshifting when in manual mode.** ● Vehicle exhibits a no crank / no start condition. This bulletin involves inspecting and possibly reprogramming the TCM, PCM and ISCM with the latest available software
18-022-26 REV. F2026-10-07. Service bulletin. Flash: Powertrain Control Module (PCM) Updates PCR9A Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P032F-00 - Combustion Engine Producing Insufficient Torque. ● P2D28-00 - Cold Start Propulsion Torque Performance. ● U0075-00 - Control Module Communication Bus "C" Off. ● P0610-00 - Control Module Vehicle Options Error. ● P0630-00 - VIN Not Programmed or Incompatible - ECM/PCM. ● P0607-00 - Control Module Performance. ● P0513-00 - Incorrect Immobilizer Key. ● C0501-00 - Left Front Wheel Speed Sensor "A" Range/Performance. ● C0507-00 - Right Front Wheel Speed Sensor "A" Range/Performance. ● C050D-00 - Left Rear Wheel Speed Sensor "A" Range/Performance. ● C0513-00 - Right Rear Wheel Speed Sensor "A" Range/Performance. ● P0520-00 - Engine Oil Pressure Sensor/Switch "A" Circuit. ● P0139-00 - O2 Sensor Circuit Slow Response (Bank 1 Sensor 2). ● P0159-00 - O2 Sensor Circuit Slow Response (Bank 2 Sensor 2).** ● P2096-00 - Downstream Fuel Trim System 1 Lean. ● P2097-00 - Downstream Fuel Trim System 1 Rich. ● P2098-00 - Downstream Fuel Trim System 2 Lean. ● P2099-00 - Downstream Fuel Trim System 2 Rich. ● P068A-00 - ECM Power De-Energized Performance-Too Early. NOTE: The above DTCs are being falsely set due to lack of robustness to the diagnostic monitor. ● P121B-00 - Active Exhaust Valve 2 Performance. ● P1217-00 - Active Exhaust Valve 1 Performance. ● P0172-00 - System To Rich (Bank 1). ● P0175-00 - Fuel System 2/1 Rich. Customers may also comment on the following: ● Vehicle exhibits a no crank / no start condition. ● Exhaust pitch does not track with acceleration. **In addition, the following software enhancement(s) are available: ● Launch Control Feature improvements. ● Resolved "Oil Level Low" warning caused by parking on incline.** This bulletin involves inspecting and possibly reprogramming the PCM, TCM and ISCM with the latest available software
74D Combo Rev22026-09-10. Service campaign. Revised Customer Satisfaction Notification 74D – Powertrain Modules Software Update Dealer Notification The powertrain modules software on about 18,900 of the above vehicles may contain multiple software issues that could cause various vehicle operating symptoms or conditions.
80D Combo Rev12026-08-19. Service campaign. CUSTOMER SATISFACTION NOTIFICATION NORTH AMERICA Powertrain Modules Software Update 80D The powertrain modules software on about 3,300 of the above vehicles may contain multiple software issues that could cause various vehicle operating symptoms or conditions.
74D Combo Rev12026-08-19. Service campaign. CUSTOMER SATISFACTION NOTIFICATION NORTH AMERICA Powertrain Modules Software Update 74D SYMPTOM DESCRIPTION The powertrain modules software on about 18,900 of the above vehicles may contain multiple software issues that could cause various vehicle operating symptoms or conditions.
a2026-08-06. Service campaign. CUSTOMER SATISFACTION NOTIFICATION NORTH AMERICA Powertrain Modules Software Update 80D The powertrain modules software on about 3,300 of the above vehicles may contain multiple software issues that could cause various vehicle operating symptoms or conditions.
74D Combo2026-08-06. Service campaign. CUSTOMER SATISFACTION NOTIFICATION NORTH AMERICA 74D Powertrain Modules Software Update The powertrain modules software on about 18,900 of the above vehicles may contain multiple software issues that could cause various vehicle operating symptoms or conditions.
18-074-262026-07-29. Service bulletin. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P2AF6-00 - Starter Relay 3 Stuck Off (with DBSM). ● P014B-00 - O2 Sensor 2-2 Delayed Response-Lean To Rich. ● P062B-00 - Internal Control Module Fuel Injector Control Performance. Customers may also comment on the following: ● Engine Stop/Start (ESS) inoperative with "Auto Stop Start Not Ready" message in Instrument Panel Cluster (IPC). The following software enhancements are also available: ● Update to enable Exhaust Gas Recirculation (EGR) disable during gear shift for smoother shifting. ● Update for the Brake System Control Module (BSCM) MIL illumination request not setting the MIL on the Powertrain Control Module (PCM). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
08-289-262026-07-29. Service bulletin. Transmission Control Module (TCM) Diagnostic Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following DTCs: ● P2797-00 - Auxiliary Transmission Fluid Pump Performance ● P1625-00 - Park Pawl System Failure NOTE: Park system still functions, no impact to park engagement. NOTE: Vehicle will not experience unintended movement. Customers may also experience one or more of the following: ● Vehicle no start due to battery discharge. ● 'Start/stop inop' message. ● 'Service Transmission' message on in Instrument Panel Cluster (IPC).