P0400 on Mitsubishi vehicles
P0400 is named on 5 Mitsubishi model years (2019–2023): 5 manufacturer filings and 0 owner reports in NHTSA’s files, across Outlander.
Which Mitsubishi model years name P0400
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2023 Mitsubishi Outlander | Engine | 1 | — |
| 2022 Mitsubishi Outlander | Engine | 1 | — |
| 2021 Mitsubishi Outlander | Engine | 1 | — |
| 2020 Mitsubishi Outlander | Engine | 1 | — |
| 2019 Mitsubishi Outlander | 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.
Mitsubishi filings that name P0400
Source: NHTSA manufacturer communicationsBulletins and campaigns Mitsubishi filed with NHTSA whose summary names P0400. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- TSB-23-13-004 Service bulletin2023-08-02 · Engine And Engine Cooling
- This Technical Service Bulletin provides instructions to reprogram the ECU with the countermeasure software when the check engine light illuminates with DTC of P0401/ P0400.
What P0400 means
Source: SAE J2012 / OBD-IIP0400 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. The record above is what Mitsubishi and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0400 a known problem on Mitsubishi vehicles?
It is a documented one: NHTSA's files hold 5 manufacturer filings and 0 owner reports naming P0400 on 5 Mitsubishi model years (2019–2023). 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 Mitsubishi models does P0400 appear on most?
2023 Outlander (1 document), 2022 Outlander (1 document), 2021 Outlander (1 document).
Does P0400 on a Mitsubishi 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.