Diagnostic trouble code · Jeep
P0303 on Jeep vehicles Cylinder 3 is misfiring
P0303 is named on 30 Jeep model years (2016–2025): 75 manufacturer filings and 7 owner reports in NHTSA’s files, across Grand Cherokee, Cherokee, Wrangler, Compass, Gladiator and 2 more.
Powertrain 30 model years 75 manufacturer filings 7 owner reports
Which Jeep model years name P0303
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2021 Jeep Grand Cherokee | Engine | 7 | — |
| 2023 Jeep Grand Cherokee | Engine | 4 | — |
| 2022 Jeep Grand Cherokee | Engine | 4 | — |
| 2021 Jeep Wrangler | Electrical System | 4 | — |
| 2020 Jeep Grand Cherokee | Engine | 3 | 1 |
| 2018 Jeep Grand Cherokee | Engine | 1 | 3 |
| 2017 Jeep Cherokee | Equipment | 3 | 1 |
| 2016 Jeep Cherokee | Electrical System | 3 | 1 |
| 2023 Jeep Wrangler | Engine | 3 | — |
| 2022 Jeep Wrangler | Engine | 3 | — |
| 2021 Jeep Gladiator | Engine | 3 | — |
| 2019 Jeep Cherokee | Equipment | 3 | — |
| 2018 Jeep Cherokee | Electrical System | 3 | — |
| 2018 Jeep Compass | Electrical System | 3 | — |
| 2018 Jeep Renegade | Equipment | 3 | — |
| 2017 Jeep Compass | Electrical System | 3 | — |
| 2017 Jeep Renegade | Electrical System | 3 | — |
| 2016 Jeep Renegade | Electrical System | 3 | — |
| 2025 Jeep Grand Cherokee | Engine | 2 | — |
| 2024 Jeep Grand Cherokee | Engine | 2 | — |
| 2024 Jeep Wrangler | Engine | 2 | — |
| 2023 Jeep Gladiator | Engine | 2 | — |
| 2022 Jeep Gladiator | Engine | 2 | — |
| 2025 Jeep Gladiator | Engine | 1 | — |
| 2025 Jeep Wrangler | Engine | 1 | — |
| 2024 Jeep Gladiator | Engine | 1 | — |
| 2020 Jeep Gladiator Pickup | Engine | 1 | — |
| 2019 Jeep Grand Cherokee | Engine | 1 | — |
| 2018 Jeep Wrangler | Engine | 1 | — |
| 2016 Jeep Grand Cherokee | Engine | — | 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 41 Electrical System 20 Equipment 13 Power Train 5
Advertisement
Jeep filings that name P0303
Source: NHTSA manufacturer communicationsBulletins and campaigns Jeep 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.
- 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
- 1400322REVA Service bulletin2022-06-04 · Fuel System, Gasoline
- 6.4L Fuel Injector High Flow Misfire This bulletin involves inspecting the Julian date on the fuel rails, fuel injectorsand possibly replacing fuel injectors. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or moreof the following Diagnostic Trouble Codes (DTCs) have been set: P0300 - Multiple Cylinder Misfire.
- 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
- 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
- 18-051-26 Service bulletin2026-04-18 · 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):** ● **P0300 - Multiple Cylinder Misfire - In Active or Stored status set during cold start catalyst heating. ● P0301 - Cylinder 1 Misfire - In Active or Stored status set du
- 18-049-26 Service bulletin2026-04-18 · Engine
- 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): ● **P0300 - Multiple Cylinder Misfire - In Active or Stored status set during cold start catalyst heating. ● P0301 - Cylinder 1 Misfire - In Active or Stored status set during
- 18-046-26 Service bulletin2026-04-16 · Engine
- 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): ● **P0300 - Multiple Cylinder Misfire (Active or Stored status set during cold start catalyst heating). ● P0301 - Cylinder 1 Misfire (Active or Stored status set during cold s
- 18-048-26 Service bulletin2026-04-17 · Engine
- 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): ● P0300 - Multiple Cylinder Misfire (Active or Stored status set during cold start catalyst heating). ● P0301 - Cylinder 1 Misfire (Active or Stored status set during cold sta
- 18-047-26 Service bulletin2026-04-17 · 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): ● P0300 - Multiple Cylinder Misfire (Active or Stored status set during cold start catalyst heating). ● P0301 - Cylinder 1 Misfire (Active or Stored status set during cold sta
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 Jeep 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 Jeep vehicles?
It is a documented one: NHTSA's files hold 75 manufacturer filings and 7 owner reports naming P0303 on 30 Jeep 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 Jeep models does P0303 appear on most?
2021 Grand Cherokee (7 documents), 2017 Cherokee (4 documents), 2016 Cherokee (4 documents).
Does P0303 on a Jeep 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.