P203E
0 owner reports and 137 manufacturer filings across 26 model years from Jeep, Ram.
Where P203E shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2019 Jeep Grand Cherokee | Electrical System | 9 | — |
| 2018 Jeep Grand Cherokee | Electrical System | 9 | — |
| 2017 Jeep Grand Cherokee | Electrical System | 9 | — |
| 2016 Jeep Grand Cherokee | Electrical System | 9 | — |
| 2020 Jeep Wrangler | Back Over Prevention | 9 | — |
| 2020 Ram 1500 | Exterior Lighting | 9 | — |
| 2019 Ram 1500 | Exterior Lighting | 9 | — |
| 2018 Ram 1500 | Electrical System | 9 | — |
| 2017 Ram 1500 | Electrical System | 9 | — |
| 2016 Ram 1500 | Back Over Prevention | 9 | — |
| 2021 Jeep Wrangler | Exterior Lighting | 5 | — |
| 2021 Ram 1500 | Back Over Prevention | 5 | — |
| 2021 Jeep Gladiator | Exterior Lighting | 4 | — |
| 2020 Ram 2500 | Fuel System, Diesel | 4 | — |
| 2019 Ram 2500 | Back Over Prevention | 4 | — |
| 2020 Ram 3500 | Fuel System, Diesel | 4 | — |
| 2019 Ram 3500 | Back Over Prevention | 4 | — |
| 2021 Ram 2500 | Fuel System, Diesel | 3 | — |
| 2021 Ram 3500 | Fuel System, Gasoline | 3 | — |
| 2023 Jeep Wrangler | Exterior Lighting | 2 | — |
| 2022 Jeep Wrangler | Back Over Prevention | 2 | — |
| 2023 Ram 1500 | Back Over Prevention | 2 | — |
| 2022 Ram 1500 | Back Over Prevention | 2 | — |
| 2023 Jeep Gladiator | Back Over Prevention | 1 | — |
| 2022 Ram 2500 | Fuel System, Diesel | 1 | — |
| 2022 Ram 3500 | Fuel System, Diesel | 1 | — |
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
What it gets filed under
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P203E. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.
- S20250000012023-02-28 · Back Over Prevention
- Malfunction Indicator Lamp Illumination (MIL). Diagnostic Trouble Code (DTC) P203E ? Reductant Level Sensor 1 Circuit Intermittent-Erratic Set.
- S20250000012023-02-28 · Back Over Prevention
- Malfunction Indicator Lamp Illumination (MIL). Diagnostic Trouble Code (DTC) P203E ? Reductant Level Sensor 1 Circuit Intermittent-Erratic Set.
- 18-034-21 REV. A2021-11-10 · Fuel System, Diesel
- P203E and P203F Additional Diagnostic Information This bulletin provides additional information regarding diagnosing Diesel Exhaust Fluid (DEF) issue in extreme cold weather. Diagnostic Trouble Codes (DTCs) P203E - Reductant Level Sensor 1 Circuit Intermittent and/or P203F - Reductant Level Too Low set.
- 18034212021-04-02 · Fuel System, Diesel
- P203E and P203F Additional Diagnostic Information This bulletin provides additional information regarding diagnosing Diesel Exhaust Fluid (DEF) issue in extreme cold weather. Diagnostic Trouble Codes (DTCs) P203E - Reductant Level Sensor 1 Circuit Intermittent and/or P203F - Reductant Level Too Low set.
- 18-034-212021-04-02 · Fuel System, Gasoline
- P203E and P203F Additional Diagnostic Information This bulletin provides additional information regarding diagnosing Diesel Exhaust Fluid (DEF) issue in extreme cold weather. Diagnostic Trouble Codes (DTCs) P203E - Reductant Level Sensor 1 Circuit Intermittent and/or P203F - Reductant Level Too Low set.
- S20250000012020-11-05 · Exterior Lighting
- (Rev. B) Malfunction Indicator Lamp Illumination (MIL). Diagnostic Trouble Code (DTC) P203E ? Reductant Level Sensor 1 Circuit Intermittent-Erratic Set.
What P203E means
Source: SAE J2012 / OBD-IIP203E sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P203E
Source: NHTSA files and the OBD-II standardCan I keep driving with P203E stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light generally means the fault was logged and the vehicle is in a reduced-risk mode; a flashing light means stop soon, because a misfiring engine can destroy a catalytic converter in minutes. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.