P0451 on Cadillac vehicles
P0451 is named on 6 Cadillac model years (2019–2024): 15 manufacturer filings and 0 owner reports in NHTSA’s files, across XT4.
Which Cadillac model years name P0451
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2020 Cadillac XT4 | Engine | 4 | — |
| 2021 Cadillac XT4 | Fuel/Propulsion System | 3 | — |
| 2019 Cadillac XT4 | Engine | 3 | — |
| 2023 Cadillac XT4 | Fuel/Propulsion System | 2 | — |
| 2022 Cadillac XT4 | Fuel/Propulsion System | 2 | — |
| 2024 Cadillac XT4 | Fuel/Propulsion System | 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.
Cadillac filings that name P0451
Source: NHTSA manufacturer communicationsBulletins and campaigns Cadillac filed with NHTSA whose summary names P0451. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIE0537 Service bulletin2019-09-16 · Engine And Engine Cooling
- This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a check engine lamp illuminated and DTC P0451 set.
- PIE0613B Service bulletin2021-05-25 · Engine
- This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Check Engine Lamp illuminated on the Driver Information Center (DIC) and/or poor fuel fill, DTC P0451 Set.
- 22-NA-203 Service bulletin2022-10-17 · Electrical System
- This technical bulletin provides a procedure to correct the condition of Check Engine Lamp Illuminated on Driver Information Center (DIC) with DTC P0451 Set.
- 22-NA-203 Service bulletin2024-04-17 · Fuel System, Gasoline
- This technical bulletin provides a procedure to correct the condition of Check Engine Lamp Illuminated on Driver Information Center (DIC) with DTC P0451 Set.
What P0451 means
Source: SAE J2012 / OBD-IIP0451 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 Cadillac 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 P0451 a known problem on Cadillac vehicles?
It is a documented one: NHTSA's files hold 15 manufacturer filings and 0 owner reports naming P0451 on 6 Cadillac model years (2019–2024). 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 Cadillac models does P0451 appear on most?
2020 XT4 (4 documents), 2021 XT4 (3 documents), 2019 XT4 (3 documents).
Does P0451 on a Cadillac 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.