{"vehicle":{"id":"2021_ram_1500","year":2021,"make":"Ram","model":"1500"},"code":"P0306","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":9,"bulletins":[{"nhtsa_id":11028881,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-19","date":"2026-02-14","document_id":"18-020-26","mfr_campaign":null,"component":"ENGINE; ELECTRICAL SYSTEM","summary":"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:","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028881-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028881-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11028881"},{"nhtsa_id":11018482,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-05-20","date":"2025-05-18","document_id":"09-011-25","mfr_campaign":null,"component":"ENGINE","summary":"\"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. \"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11018482-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11018482-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11018482"},{"nhtsa_id":10230132,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-01-17","date":"2021-05-22","document_id":"1805021","mfr_campaign":null,"component":"POWER TRAIN; ELECTRICAL SYSTEM; EXTERIOR LIGHTING; BACK OVER PREVENTION; FUEL SYSTEM, GASOLINE","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10230132-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10230132-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10230132"},{"nhtsa_id":10227742,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-12-12","date":"2022-10-06","document_id":"1814522","mfr_campaign":null,"component":"POWER TRAIN; FUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10227742-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10227742-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10227742"},{"nhtsa_id":10223498,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-10-17","date":"2021-05-22","document_id":"1805021","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10223498-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10223498-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10223498"},{"nhtsa_id":10223360,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-10-17","date":"2021-05-22","document_id":"1805021","mfr_campaign":null,"component":"POWER TRAIN; ELECTRICAL SYSTEM","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10223360-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10223360-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10223360"},{"nhtsa_id":10198454,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-06-28","date":"2021-05-22","document_id":"18-050-21","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; POWER TRAIN","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10198454-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10198454-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10198454"},{"nhtsa_id":10187706,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-03-01","date":"2020-12-12","document_id":"09-013-20 REV. A","mfr_campaign":null,"component":"EQUIPMENT; ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:IGNITION:COIL:SPARK PLUGS; ENGINE","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10187706-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10187706-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10187706"},{"nhtsa_id":10187686,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-03-01","date":"2020-12-05","document_id":"09-013-20","mfr_campaign":null,"component":"ENGINE; EQUIPMENT; ELECTRICAL SYSTEM","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10187686-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10187686-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10187686"}],"url":"https://open.wenmarpro.com/makes/ram/1500/2021/bulletins?code=P0306"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/ram/1500/2021/codes/P0306","note":"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.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}