P121B on the 2026 Dodge Charger
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| 18-022-26 REV. F | 2026-10-07. 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 |
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| 18-022-26 REV. E | 2026-05-28. Service bulletin. Flash: Powertrain Control Module (PCM) 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): ● 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. Customers may also comment on the following: ● Vehicle exhibits a no crank / no start condition. ● Exhaust pitch does not track with acceleration. This bulletin involves inspecting and possibly reprogramming the PCM, TCM and ISCM with the latest available software. |
| 18-022-26 REV. D | 2026-05-06. Service bulletin. Flash: Powertrain Control Module (PCM) 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): ● 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. Customers may also comment on the following: ● Exhaust pitch does not track with acceleration. |
| 18-022-26 REV.B | 2026-04-10. 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): ● 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. Customers may also comment on the following: ● Exhaust pitch does not track with acceleration. statement and updated and additional Repair Procedure steps. |
| 18-022-26 REV.A | 2026-04-01. 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): ● 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. Customers may also comment on the following: ● Exhaust pitch does not track with acceleration. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software. |
| 18-022-26 | 2026-03-05. Service bulletin. 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): ● P121B-00 - Active Exhaust Valve 2 Performance. ● P1217-00 - Active Exhaust Valve 1 Performance. Customers may comment on the following: ● Exhaust pitch does not track with throttle input. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software. |
6 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.