# P0306 on the 2021 Ram 1500

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.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0306

- [11028881](https://open.wenmarpro.com/bulletins/11028881), 2026-02-19: 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 \(DTCs\): ● P0300\-00 \- Multiple Cylinder Misfire \- in Active or Stored status set during cold start catalyst heating. ● P0301\-00 \- Cylinder 1 Misfire \- in Active or Stored status set during cold start catalyst heating. ● P0302\-00 \- Cylinder 2 Misfire \- in Active or Stored status set during cold start catalyst heating. ● P0303\-00 \- Cylinder 3 Misfire \- in Active or Stored status set during cold start catalyst heating. ● P0304\-00 \- Cylinder 4 Misfire \- in Active or Stored status set during cold start catalyst heating. ● P0305\-00 \- Cylinder 5 Misfire \- in Active or Stored status set during cold start catalyst heating. ● P0306\-00 \- Cylinder 6 Misfire \- in Active or Stored status set during cold start catalyst heating.\*\* ● P0335 \- Crankshaft Position Sensor Circuit. ● P0339 \- Crankshaft Position Sensor Intermittent. \*\*Customers may comment on one or more of the following: ● Vehicle has a rough idle. ● Engine has a miss. ● Noisy valvetrain.\*\* Other software enhancement included with this update: ● Idle stability improvements during Electronic Stability Control \(ESC\) events. , Claims Data and Special Tools sections, updated LOP number, Repair Procedure and new Repair Procedure notes. \*\*REPAIR SUMMARY:
- [11018482](https://open.wenmarpro.com/bulletins/11018482), 2025-05-20: "Misfire Diagnostic Trouble Codes \(DTCs\), Rough Idle, Valvetrain Noise Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0301 \- Cylinder 1 Misfire. ● P0302 \- Cylinder 2 Misfire. ● P0303 \- Cylinder 3 Misfire. ● P0304 \- Cylinder 4 Misfire. ● P0305 \- Cylinder 5 Misfire. ● P0306 \- Cylinder 6 Misfire. Customers may comment on one or more of the following: ● Rough idle. ● Valvetrain noise. "
- [10230132](https://open.wenmarpro.com/bulletins/10230132), 2023-01-17: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0133 \- O2 Sensor 1/1 Slow Response. P0153 \- O2 Sensor 2/1 Slow Response. P0171 \- Fuel System 1/1 Lean. P0174 \- Fuel System 2/1 Lean. P0300 \- Multiple Cylinder Misfire. P0301 \- Cylinder 1 Misfire. P0302 \- Cylinder 2 Misfire. P0303 \- Cylinder 3 Misfire. P0304 \- Cylinder 4 Misfire. P0305 \- Cylinder 5 Misfire. P0306 \- Cylinder 6 Misfire. P0307 \- Cylinder 7 Misfire. P0308 \- Cylinder 8 Misfire. B2286 \- Calibration Not Learned / Lost Calibration. The customer may also experience one or more of the following:Hesitation feel during a pedal tip in, while engine is warming up below \-1 °C \(30 °F\) ambient temp. During a 2 \- 3 transmission upshift, the engine is hitting rev limit. ?Service Suspension? message in Instrument Panel Cluster \(IPC\) on start up.
- [10227742](https://open.wenmarpro.com/bulletins/10227742), 2022-12-12: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with thelatest available software. The customer may experience one or more of the following: Generic Scan Tool shows incorrect PCM Calibration Part Number and Emissions type:OBDI not OBDII\(North America Only\). Hesitation feel during a pedal tip in, while engine is warming up below \-1 °C \(30 °F\) ambient temp. During a 2 \- 3 transmission upshift, the engine is hitting rev limit\(DFS Sales Code Only\). ?Service Suspension? message in Instrument Panel Cluster \(IPC\) on start up. Customers may also experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigationthe technician may find that the one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0133 \- O2 Sensor 1/1 Slow Response. P0153 \- O2 Sensor 2/1 Slow Response. P0171 \- Fuel System 1/1 Lean. P0174 \- Fuel System 2/1 Lean. P0300 \- Multiple Cylinder Misfire. P0301 \- Cylinder 1 Misfire. P0302 \- Cylinder 2 Misfire. P0303 \- Cylinder 3 Misfire. P0304 \- Cylinder 4 Misfire. P0305 \- Cylinder 5 Misfire. P0306 \- Cylinder 6 Misfire. P0307 \- Cylinder 7 Misfire. P0308 \- Cylinder 8 Misfire. B2286 \- Calibration Not Learned / Lost Calibration.
- [10223498](https://open.wenmarpro.com/bulletins/10223498), 2022-10-17: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0133 \- O2 Sensor 1/1 Slow Response. P0153 \- O2 Sensor 2/1 Slow Response. P0171 \- Fuel System 1/1 Lean. P0174 \- Fuel System 2/1 Lean. P0300 \- Multiple Cylinder Misfire. P0301 \- Cylinder 1 Misfire. P0302 \- Cylinder 2 Misfire. P0303 \- Cylinder 3 Misfire. P0304 \- Cylinder 4 Misfire. P0305 \- Cylinder 5 Misfire. P0306 \- Cylinder 6 Misfire. P0307 \- Cylinder 7 Misfire. P0308 \- Cylinder 8 Misfire. B2286 \- Calibration Not Learned / Lost Calibration. The customer may also experience one or more of the following:Hesitation feel during a pedal tip in, while engine is warming up below \-1 °C \(30 °F\) ambient temp. During a 2 \- 3 transmission upshift, the engine is hitting rev limit. ?Service Suspension? message in Instrument Panel Cluster \(IPC\) on start up.
- [10223360](https://open.wenmarpro.com/bulletins/10223360), 2022-10-17: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0133 \- O2 Sensor 1/1 Slow Response. P0153 \- O2 Sensor 2/1 Slow Response. P0171 \- Fuel System 1/1 Lean. P0174 \- Fuel System 2/1 Lean. P0300 \- Multiple Cylinder Misfire. P0301 \- Cylinder 1 Misfire. P0302 \- Cylinder 2 Misfire. P0303 \- Cylinder 3 Misfire. P0304 \- Cylinder 4 Misfire. P0305 \- Cylinder 5 Misfire. P0306 \- Cylinder 6 Misfire. P0307 \- Cylinder 7 Misfire. P0308 \- Cylinder 8 Misfire. B2286 \- Calibration Not Learned / Lost Calibration. The customer may also experience one or more of the following:Hesitation feel during a pedal tip in, while engine is warming up below \-1 °C \(30 °F\) ambient temp. During a 2 \- 3 transmission upshift, the engine is hitting rev limit. ?Service Suspension? message in Instrument Panel Cluster \(IPC\) on start up.
- [10198454](https://open.wenmarpro.com/bulletins/10198454), 2021-06-28: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0133 \- O2 Sensor 1/1 Slow Response. P0153 \- O2 Sensor 2/1 Slow Response. P0171 \- Fuel System 1/1 Lean. P0174 \- Fuel System 2/1 Lean. P0300 \- Multiple Cylinder Misfire. P0301 \- Cylinder 1 Misfire. P0302 \- Cylinder 2 Misfire. P0303 \- Cylinder 3 Misfire. P0304 \- Cylinder 4 Misfire. P0305 \- Cylinder 5 Misfire. P0306 \- Cylinder 6 Misfire. P0307 \- Cylinder 7 Misfire. P0308 \- Cylinder 8 Misfire. B2286 \- Calibration Not Learned / Lost Calibration. The customer may also experience one or more of the following:Hesitation feel during a pedal tip in, while engine is warming up below \-1 °C \(30 °F\) ambient temp. During a 2 \- 3 transmission upshift, the engine is hitting rev limit. ?Service Suspension? message in Instrument Panel Cluster \(IPC\) on start up.
- [10187706](https://open.wenmarpro.com/bulletins/10187706), 2021-03-01: 3.6L Pentastar Upgrade Spark Plug Internal Crack This bulletin involves replacing all six spark plugs. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation, a technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set:P0301 \- Cylinder 1 Misfire. P0302 \- Cylinder 2 Misfire. P0303 \- Cylinder 3 Misfire. P0304 \- Cylinder 4 Misfire. P0305 \- Cylinder 5 Misfire. P0306 \- Cylinder 6 Misfire. Customers may also comment on the following:Rough running engine.
- [10187686](https://open.wenmarpro.com/bulletins/10187686), 2021-03-01: 3.6L Pentastar Upgrade Spark Plug Internal Crack This bulletin involves replacing all six spark plugs. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation, a technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set:P0301 \- Cylinder 1 Misfire. P0302 \- Cylinder 2 Misfire. P0303 \- Cylinder 3 Misfire. P0304 \- Cylinder 4 Misfire. P0305 \- Cylinder 5 Misfire. P0306 \- Cylinder 6 Misfire. Customers may also comment on the following: Rough running engine.