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2021 Jeep Wrangler Unlimited Rubicon 4xE
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Took my 4xe in for it’s first oil change today and they performed RRT’s on it. Dealer wasn’t quite sure what the updates did, but performed them on my vehicle. Can anybody that is a Jeep dealer mechanic or expert tell me what these RRT’s actual do?
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I just got my 4xe back from the dealer for a check Engine light and learned that they installed 6 RRT patches. {21-126, 21-127, 21-137, 21-122, 21-123, 21-124). They could not tell me the purpose of the patches, but it did fix the check engine light. However I did notice that the "Max Regen" button returns to the same state when the Jeep is turned off. (Yay!). No more having to push Max Regen every-time I start my Jeep.

As to the RRT updates, does anyone have any description of what these updates fixed? It would be helpful to know just so I can keep watch for something else that may pop up as a result of the updates.
 

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I don’t have specifics on what each software update does, but I also had them done when we went in for the service bulletin on the harness clip seal, which is now on order to be replaced.
I’m assuming one of them has to do with the regen button staying in it’s last configuration instead of defaulting to off.
We took a drive yesterday and I also noticed that the max regen stayed on after we had stopped and restarted the Jeep, I guess they’re listening.
Another update might have addressed the lag or throttle tip in when running on ICE, my wife had mentioned several times to me that when the battery was depleted and the engine was running, it had no “go” power from a stop, like crawling away getting passed dangerous! I chalked this up to her just being used to the instant torque felt from running on electric and needing to get on the peddle a bit more when running on engine power, but after picking it up from the dealership after the updates, with battery still depleted, we didn’t notice it.
It is also possible one of the updates addressed the “mode’ button to remain in it’s last configuration, does it default to hybrid? I don’t remember what it did before and I could be wrong on this. Will have to check next time I drive it.


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My Jeep has been under investigation for 1 month by engineers from Jeep after an electric arc cooked my charging system. The dealer's technician told me 2 days ago that they discovered issues with the port and the board that distributes power from the battery and manages recharge. It had something to do with signal latency while unplugging the charger and also, manage the 3 liquid cooling pumps in the backseat battery system. Although many parts were replaced on my Jeep, the 6 fixes had something to do with debugging the motherboard in that regard.

From the original Jeep I received a few months ago and the one I'm driving now, I noticed that the regen button stays on now, I also noticed that the use-gaz-only third button doesn't work like it used to do, meaning that the motor will shut down like the hybrid mode does, using a little bit of battery, which is annoying.
 

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CSN Y46 is to inspect/replace a High Voltage Cable Connector Seal on about 11,100 vehicles causing DTCs P1D72 (Open High Voltage Cable), P0A0A (High Voltage System Interlock Circuit "A" Is Active). "The vehicle will operate on gas engine only if failure occurs and potentially not restart if keyed off".

RRT 21-122 (aka TSB 21-028-21) is an update for the TCM (Transmission Control Module) and addresses DTCs U0293-00 (Lost Communication With Hybrid Control Module), P0732-00 (Gear 2 Shift Incorrect Ratio), P061B-00 (Internal Control Module Torque Calculation Performance) The issue this addresses is "2-1 downshift improvement". Also requires the HCP, AHCP/PIM, PCM, BPCM, and IDCM to be updated as well.

RRT 21-123 (aka TSB 08-141-21) is an update for the BPCM (Battery Pack Control Module) and addresses DTCs U0111 (Lost Communication With Hybrid Battery Pack Sensor Module), P0EDD-00 (Hybrid/EV Battery Pack B Deterioration), P0CA7-00 (Hybrid/EV Battery Discharging Current High), P1A0C-00 (Battery Energy Control Module System Voltage Low). The issue this addresses is "Customers may experience a false Malfunction Indicator Lamp (MIL) illumination related to PHEV battery". Also requires the HCP, AHCP/PIM, TCM, PCM, and IDCM to be updated as well.

RRT 21-124 (aka TSB 18-074-21) is an update for the PCM (Powertrain Control Module) and addresses DTCs U0402-00 (Implausible Data Received From TCM), U145D (Implausible Data Received From TCM On D-PT). Also requires the HCP, AHCP/PIM, TCM, BPCM, and IDCM to be updated as well.

RRT 21-126 (aka TSB 08-144-21) is an update for the HCP (Hybrid Control Processor) and AHCP (Auxiliary Hybrid Control Processor) aka PIM (Power Inverter Module) and addresses DTCs P061B-00 (Internal Control Module Torque Calculation Performance), P06A3-00 (Sensor Reference Voltage "D" Circuit/Open), P0697-00 (Sensor Reference Voltage 3 Circuit). NOTE: "P061B-00 DTC may set after driving on ice/snow in 2WD and Traction Control System (TCS) is turned OFF". Also requires the PCM, TCM, BPCM, and IDCM to be updated as well.

RRT 21-127 (aka TSB 08-145-21) is an update for the IDCM (Integrated Dual Charging Module) and addresses DTC P0D27-00 (Battery Charger 1 Input Voltage Too Low). The issue this addressed is "Vehicle would not charge and the charge station circuit breaker in the house/receptacle trips when its plugged into the vehicle". Also requires the PCM, TCM, BPCM, HCP, and AHCP/PIM to be updated as well.

RRT 21-137 is reportedly Case Number: S2114000002 and is for a replacement fuel cap tether getting caught under the fuel cap causing DTCs P04EC (EVAP System Large Leak Detected - Fuel Tank Side Stored), P04EE (EVAP System Very Small Leak Detected - Fuel Tank Side)

RRT 21-170 is reportedly for the Lower Ball Joint Nut Torque. The lower ball joints were not properly torqued at the factory and may cause loose steering and can be heard as a popping/clicking noise when turning at low speeds.
 

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4xeRubicon - Great information, thank you. Took mine in yesterday for first oil change, they showed me three RRTs they could not knock out yesterday due to time limit. They spent a lot of time trying to replicate a noise when the One Touch Soft top is open. Of course, as I drive out of the dealer I can replicate it. oh well, will try another dealer. FYI, my max regen button has stayed on since day one, build date was 7/21.
 
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