Diagnostic trouble code · Ram
P0303 on Ram vehicles Cylinder 3 is misfiring
P0303 is named on 14 Ram model years (2016–2025): 32 manufacturer filings and 1 owner report in NHTSA’s files, across 1500, Promaster City, ProMaster.
Powertrain 14 model years 32 manufacturer filings 1 owner report
Which Ram model years name P0303
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2025 Ram 1500 | Power Train | 6 | 1 |
| 2020 Ram 1500 | Power Train | 4 | — |
| 2021 Ram 1500 | Electrical System | 3 | — |
| 2018 Ram Promaster City | Equipment | 3 | — |
| 2017 Ram Promaster City | Electrical System | 3 | — |
| 2016 Ram Promaster City | Equipment | 3 | — |
| 2023 Ram 1500 | Exterior Lighting | 2 | — |
| 2022 Ram 1500 | Power Train | 2 | — |
| 2025 Ram ProMaster | Engine | 1 | — |
| 2024 Ram 1500 | Engine | 1 | — |
| 2024 Ram ProMaster | Engine | 1 | — |
| 2023 Ram ProMaster | Engine | 1 | — |
| 2022 Ram ProMaster | Engine | 1 | — |
| 2019 Ram Promaster City | Power Train | 1 | — |
A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.
Engine 10 Power Train 8 Electrical System 8 Equipment 5
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Ram filings that name P0303
Source: NHTSA manufacturer communicationsBulletins and campaigns Ram filed with NHTSA whose summary names P0303. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 18-071-24 Service bulletin2024-09-21 · Power Train
- "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): ● P018B - Fuel Pressure Sensor ""B"" Circuit Range/performance. ● P2AF6 - Starter Relay 3 Stuck Off. ● P1CEA - Boost Side EVAP Purge System Performance. ● U0104 - Lost Communication W
- 18-071-24 REV. A Service bulletin2024-10-08 · Power Train
- "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): ● P018B - Fuel Pressure Sensor ""B"" Circuit Range/performance. ● P2AF6 - Starter Relay 3 Stuck Off. ● P1CEA - Boost Side EVAP Purge System Performance. ● U0104 - Lost Communication W
- 18-071-24 REV. B Service bulletin2024-11-01 · Power Train
- "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): ● **P0325 - Knock/Combustion Vibration Sensor 1 Circuit. ● P0330 - Knock/Combustion Vibration Sensor 2 Circuit. ● P032A - Knock-Combustion Vibration Sensor C Circuit.** ● P018B - Fuel
- 18-062-20 REV. A Service bulletin2020-12-16 · Electrical System
- 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 DTCs have been set:P0300 - Multiple Cylinder Misfire. P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Misfir
- 18-022-21 Service bulletin2021-02-17 · Power Train
- 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 DTCs have been set:P0300 - Multiple Cylinder Misfire. P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Misfir
- 1802221 Service bulletin2021-02-17 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
- 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 DTCs have been set:P0300 - Multiple Cylinder Misfire. P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Misfir
- 09-013-20 Service bulletin2020-12-05 · Electrical System
- 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 - Cyli
- 09-013-20 REV. A Service bulletin2020-12-12 · Electrical System
- 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 - Cyli
- 09-011-25 Service bulletin2025-05-18 · Engine
- "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 - Cy
- 08-027-20 Service bulletin2020-03-04 · Electrical System
- 2.4L Ignition Coil Boot Replacement This bulletin involves replacing all four ignition coil insulating boots. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find thatone or more of the following Diagnostic Trouble Codes (DTCs) have been set:P0300 - Multiple Cylinder Misfire P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Mis
- 08-027-20 Service bulletin2020-03-04 · Equipment
- 2.4L Ignition Coil Boot Replacement This bulletin involves replacing all four ignition coil insulating boots. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find thatone or more of the following Diagnostic Trouble Codes (DTCs) have been set:P0300 - Multiple Cylinder Misfire P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Mis
- 08-027-20 Service bulletin2020-03-04 · Equipment
- 2.4L Ignition Coil Boot Replacement This bulletin involves replacing all four ignition coil insulating boots. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set:P0300 - Multiple Cylinder Misfire P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Mi
What P0303 means
Source: SAE J2012 / OBD-IICylinder 3 is misfiring.
A stored code names the test that failed, never the part that caused it. The record above is what Ram and its owners have filed about it; the code’s page across every make has the whole file.
From here
Common questions
Source: NHTSA files and the OBD-II standardIs P0303 a known problem on Ram vehicles?
It is a documented one: NHTSA's files hold 32 manufacturer filings and 1 owner report naming P0303 on 14 Ram model years (2016–2025). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which Ram models does P0303 appear on most?
2025 1500 (7 documents), 2020 1500 (4 documents), 2021 1500 (3 documents).
Does P0303 on a Ram mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.