# Service bulletin S2621000004

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.

- Type: Service bulletin
- NHTSA id: 11038329
- Published by NHTSA: 2026\-10\-07
- Manufacturer's number: S2621000004
- Manufacturer's date: 2026\-09\-30
- NHTSA component: POWER TRAIN

## NHTSA's summary

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 \(850RE Transmission Only\)

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11038329-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11038329-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2018 to 2023 CHRYSLER 300
- 2018 to 2023 DODGE CHALLENGER
- 2018 to 2023 DODGE CHARGER
- 2018 to 2026 DODGE DURANGO
- 2020 to 2026 JEEP GLADIATOR
- 2018 to 2027 JEEP GRAND CHEROKEE
- 2022 to 2026 JEEP GRAND CHEROKEE 4XE
- 2021 to 2027 JEEP GRAND CHEROKEE L
- 2018 to 2026 JEEP WRANGLER
- 2021 to 2026 JEEP WRANGLER 4XE
- 2018 to 2026 RAM 1500

## Recalls for the same vehicles and component

- [26V413000](/recalls/nhtsa/26V413000.md), 2026-06-30: POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION \(PRNDL\)
- [24V572000](/recalls/nhtsa/24V572000.md), 2024-08-01: POWER TRAIN:MANUAL TRANSMISSION:CONTROL MODULE:SOFTWARE
- [2024325](/recalls/tc/2024325.md), 2024-06-06: Powertrain
- [24V413000](/recalls/nhtsa/24V413000.md), 2024-06-06: POWER TRAIN:MANUAL TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION
- [23V641000](/recalls/nhtsa/23V641000.md), 2023-09-18: POWER TRAIN:MANUAL TRANSMISSION
- [23V640000](/recalls/nhtsa/23V640000.md), 2023-09-18: POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:COLUMN SHIFT
- [2023335](/recalls/tc/2023335.md), 2023-06-08: Powertrain
- [23V265000](/recalls/nhtsa/23V265000.md), 2023-04-13: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)
- [2023089](/recalls/tc/2023089.md), 2023-02-23: Powertrain
- [23V116000](/recalls/nhtsa/23V116000.md), 2023-02-23: POWER TRAIN:CLUTCH ASSEMBLY

## Other bulletins for the same vehicles and component

- [AOD COMBO](/bulletins/11038324.md), 2026-10-07, Service campaign: POWER TRAIN. Customer Satisfaction Notification A0D – Electronic Shift Module \- Dealer Notification The Electronic Shift Module \(ESM\) software on about 20,000 of the above vehicles may cause the rotary electronic shifter to become unresponsive. This condition may cause a "Service Shifter" message to appear on the instrument panel cluster and prevent the vehicle from starting.
- [18\-075\-26 REV. A](/bulletins/11038313.md), 2026-10-07, Service bulletin: POWER TRAIN. 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 \(DTCs\): ● P0111\-00 \- Intake Air Temperature Sensor 1 Circuit Performance \(In Active or Stored status\) ● P0071\-00 \- Ambient Air Temperature Sensor Performance \(In Active or Stored status\) ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High \(In Active or Stored status\) ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance ● P0E7E\-00 \- Coolant Bypass Valve B Control Circuit \(In Active or Stored status\) ● P2AF6\-00 \- Starter Relay 3 Stuck Off \(with PCR\). ● P00FD \- Battery B State Of Charge Performance. ● P013F\-00 \- O2 Sensor 2/1 Delayed Response \- Lean To Rich Bank. \(In Active or Stored status\) ● P014A\-00 \- O2 Sensor 2/2 Delayed Response \- Rich to Lean Bank. \(In Active or Stored status\) ● P013E\-00 \- O2 Sensor 2/1 Delayed Response \- Rich to Lean Bank. \(In Active or Stored status\) ● P014B\-00 \- O2 Sensor 2/2 Delayed Response \- Lean To Rich Bank. \(In Active or Stored status\) ● P06DD\-00 \- Engine Oil Pressure Control Circuit Performance/Stuck Off.\(In Active or Stored status\) ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High. \(In Active or Stored status\) ● P0071\-00 \- Ambient Air Temperature Sensor Performance. \(In Active or Stored status\) ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected. \(In Active or Stored status\) ● P1CEA\-00 \- Boost Side EVAP Purge System Performance. \(In Active or Stored status\) ● P05BD\-00 \- Stop\-Start Mode Switch Range/Performance. \(In Active or Stored status\) ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking. \(In Active or Stored status\) ● U0673\-00 \- Lost Communication With Ion Sense Module. \(In Active or Stored status\) Customers may also comment on one or more of the following: ● High Elevation misfire. Electronic Start Stop \(ESS\) inoperative or "Auto Stop/Start Not Ready" message displayed in the Instrument Panel Cluster \(IPC\). NOTE: \*\*Normal Auto Stop/Start inhibit conditions should not be considered the cause of this concern. The condition is associated with DTC P2AF6.\*\* ● "Door Ajar" message on when door is closed. ● BSCM MIL illumination request not setting the MIL in the PCM High oil level indicator illuminated on the IPC. \*\*The following software enhancements are now available: ● Improvements to prevent misfire DTCs P0300\-P0306 that may set if one of the following DTCs set: ○ P0335\-00 \- Crankshaft Position Sensor Circuit. ○ P0336\-00 \- Crankshaft Position Sensor Performance.\*\* This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [18\-071\-26 REV. A](/bulletins/11038312.md), 2026-10-07, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*P2237\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. ● P2240\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1. ● P2251\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. ● P2254\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1. ● P2243\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. ● P2247\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1. ● P015B\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 1 Sensor 1. ● P015D\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 2 Sensor 1. ● P0E7C\-00 \- Coolant Bypass Valve "B" Control Circuit Low. ● P0E7D\-00 \- Coolant Bypass Valve "B" Control Circuit High. ● P0E7E\-00 \- Coolant Bypass Valve "B" Control Circuit Range/Performance. ● P0E7F\-00 \- Coolant Bypass Valve "B" Control Circuit Stuck/Open. ● U063C\-00 \- Lost Communication With Coolant Bypass Valve Actuator "B". ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P0101\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance. ● P0461\-00 \- Fuel Level Sensor "A" Circuit Range/performance. ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low. ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance. ● B1810\-00 \- Driver Door Shorted Low. ● B25C7\-00 \- Redundant Driver Door Shorted Low.\*\* ● U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.
- [114741](/bulletins/11037596.md), 2026-09-30, Service bulletin: POWER TRAIN. TRANSMISSION KIT \- WITH TORQUE CONVERTER
- [114738](/bulletins/11037594.md), 2026-09-30, Service bulletin: POWER TRAIN. TRANSMISSION KIT \- WITH TORQUE CONVERTER
- [114737](/bulletins/11037593.md), 2026-09-30, Service bulletin: POWER TRAIN. TRANSMISSION KIT \- WITH TORQUE CONVERTER
- [21\-062\-26](/bulletins/11037573.md), 2026-09-30, Service bulletin: POWER TRAIN. Transmission Rattle Customers may comment on the following: SYMPTOM: ● Rattle noise coming from the transmission. This bulletin involves inspecting and possibly tightening the transmission oil heater mounting nuts to proper specification.
- [9100904](/bulletins/11037349.md), 2026-09-17, Service bulletin: POWER TRAIN. Shifter If shifter is having trouble shifting between 1st and 2nd gear, then adjust cables as described in service library.
- [S2418000012 REV.C](/bulletins/11037155.md), 2026-09-08, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Mil On/Check Engine Lamp \(CEL\) On, Engine Runs Rough
- [18\-077\-26](/bulletins/11036359.md), 2026-08-26, Service bulletin: POWER TRAIN; ENGINE. Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P0300 \- Multiple Cylinder Misfire. Customers may experience one of the following: ● Vehicle runs rough on initial cold start only after an overnight or extended soak. \*\*This bulletin involves reprogramming the PCM with the latest available software.\*\*

JSON: [/v1/bulletins/11038329](/v1/bulletins/11038329)

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