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Service bulletin 21-017-24 REV. B

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 id11001224
Published by NHTSA2024-06-07
Manufacturer's number21-017-24 REV. B
Manufacturer's date2024-05-09
NHTSA componentPOWER TRAIN
Manufacturer's systemTransmission Control Module

NHTSA's summary

"Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P06E4 - Control Module Wake-up Circuit Performance. ● B12B4 - Charge Status Indicator Module Internal. ● P061B - Internal Control Module Torque Calculation Performance. ● P0810 - Clutch Position Control Error. ● P2885 - Engine Disconnect Clutch Engagement Fault. **Customers may experience one or more of the following: ● Shifts rough occasionally. ● Harsh shifts when tipping in during a coast down. ● Shifts roughly during coast down.** This bulletin involves reprogramming the TCM, Powertrain Control (PCM) and the Auxiliary Hybrid Control Processor (AHCP) also known as Power Inverter Module (PIM), with the latest available software."

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

B12B4, P061B, P06E4, P0810, P2885

Vehicles listed
JEEP WRANGLER 4XE2024 (the catalog's model; the bulletin names a series or trim of it)

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)
1147412026-09-30. Service bulletin. TRANSMISSION KIT - WITH TORQUE CONVERTER
21-041-26 REV. A2026-07-02. Service bulletin. Transmission Auxiliary Oil Pump Failure Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set **one or more the following Diagnostic Troubles Code (DTCs): ● U0287-00 - Lost Communication With Transmission Fluid Pump Module 1.** ● P0B0D-00 - Electric/Auxiliary Transmission Fluid Pump Motor Control Module. Customers may also comment on the following: ● Vehicle is in limp mode. This bulletin involves replacing the transmission oil pump.
21-041-262026-05-20. Service bulletin. Transmission Auxiliary Oil Pump Failure Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code (DTC): ● P0B0D-00 - Electric/Auxiliary Transmission Fluid Pump Motor Control Module. Customers may also comment on the following: ● Vehicle is in limp mode This bulletin involves replacing the transmission oil pump.
18-003-26 REV A2026-04-22. 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): ● **P0300 - Multiple Cylinder Misfire (Active or Stored status set during cold start catalyst heating). ● P0301 - Cylinder 1 Misfire (Active or Stored status set during cold start catalyst heating). ● P0302 - Cylinder 2 Misfire (Active or Stored status set during cold start catalyst heating). ● P0303 - Cylinder 3 Misfire (Active or Stored status set during cold start catalyst heating). ● P0304 - Cylinder 4 Misfire (Active or Stored status set during cold start catalyst heating). ● P0305-00 - Cylinder 5 Misfire (Active or Stored status set during cold start catalyst heating). ● P0306-00 - Cylinder 6 Misfire (Active or Stored status set during cold start catalyst heating).** ● P0032 - O2 - Sensor 1/1 Heater Circuit High. ● P0038 - O2 - Sensor 1/2 Heater Circuit High. ● P0052 - O2 - Sensor 2/1 Heater Circuit High. ● P0058 - O2 - Sensor 2/2 Heater Circuit High. ● P1129 - Closed Loop Fueling Not Achieved-Banks 2 Upstream. ● P0152 - O2 Sensor 2/1 Circuit High. ● P0158 - O2 Sensor 2/2 Circuit High. ● P2504 - Charging System Output High. ● P0563 - System Voltage High. ● P08A6 - Gear Lever Position Sensor System - Multiple Sensor Correlation. (Manual Transmission Only) ● P152F - Engine Hood Switch 2 / Engine Hood Switch 1 Correlation. ● P1129 - Closed Loop Fueling Not Achieved - Bank 2 Upstream. ● P0152-02 - O2 Sensor 2/1 Circuit High. ● P0158-02 - O2 Sensor 2/2 Circuit High. ● P2504 - Charging System Output High. ● P0563 - Battery/System Voltage High. Customers may also comment on one or more of the following: ● **The vehicle has a rough idle. ● The engine has a miss or runs rough. ● Noisy valvetrain. M18 FSAR-TSB-7163 -2- ● "Service Transmission" message in the Instrument Panel Cluster (IPC) due to clutch slip detection with the transfer case in neutra
S2621000003 REV.A2026-03-18. Service bulletin. The vehicle will exhibit a service transmission/check engine warning indicator for the following transmission models: 845RE, 8HP45, 850RE, 8HP50, 8HP70, 8HP75, 8HP75-PHEV, 8HP75-LCV, 8HP90, 8HP95. Transmissions may exhibit the following diagnostic codes: P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
S26030000012026-03-05. Service bulletin. A suspected leak may be noticed on the front or rear axle pinion seal.
S26210000032026-03-05. Service bulletin. Service transmission/check engine warning indicator for the 850RE, 8HP50, 8HP70, 8HP75, 8HP75-PHEV transmissions that have fault codes P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
9100749 Rev 12026-01-21. Service bulletin. We have observed that some JL/JT rear axle shafts are leaking oil. Replace axle shaft and seal together. Do not replace seal only. Keep original seal and axle shaft and send the parts as fast track.
91007492026-01-14. Service bulletin. axle seal We have observed that some JL/JT rear axle shafts are leaking oil. Replace axle shaft and seal together. Do not replace seal only. Keep original seal and axle shaft and send the parts as fast track.