P30C3 on Cadillac vehicles
P30C3 is named on 5 Cadillac model years (2020–2024): 19 manufacturer filings and 0 owner reports in NHTSA’s files, across CT4.
Which Cadillac model years name P30C3
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2022 Cadillac CT4 | Exterior Lighting | 5 | — |
| 2021 Cadillac CT4 | Electrical System | 5 | — |
| 2020 Cadillac CT4 | Exterior Lighting | 5 | — |
| 2023 Cadillac CT4 | Exterior Lighting | 3 | — |
| 2024 Cadillac CT4 | Exterior Lighting | 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 P30C3
Source: NHTSA manufacturer communicationsBulletins and campaigns Cadillac filed with NHTSA whose summary names P30C3. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIP5843 Service bulletin2022-03-03 · Exterior Lighting
- This Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
- PIP5843A Service bulletin2022-12-05 · Electrical System
- This Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
- PIP5843B Service bulletin2023-01-13 · Engine And Engine Cooling
- This Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
- PIP5843C Service bulletin2023-06-20 · Exterior Lighting
- This Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
- PIP5843D Service bulletin2024-03-06 · Exterior Lighting
- This Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
What P30C3 means
Source: SAE J2012 / OBD-IIP30C3 is a manufacturer-specific code: the second character is a 3, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.
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 P30C3 a known problem on Cadillac vehicles?
It is a documented one: NHTSA's files hold 19 manufacturer filings and 0 owner reports naming P30C3 on 5 Cadillac model years (2020–2024). 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 P30C3 appear on most?
2022 CT4 (5 documents), 2021 CT4 (5 documents), 2020 CT4 (5 documents).
Does P30C3 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.