Service bulletins for the 2018 Cadillac CTS
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
1149 on file from NHTSA, as of 2026-10-19.
About P0300 on the 2018 Cadillac CTS: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0300 are shown. Show all
| PIP5498E | 2018-01-16. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates A vehicle may have a concern of DTCP050D setting along with a P0300 after a cold start up. White smoke and/or coolant odor may come from exhaust for an extended period of time at cold start as well. Cause Coolant getting into the cylinders, and provides direction for the repair. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.