Service bulletins for the 2018 Chevrolet Impala
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.
882 on file from NHTSA, as of 2026-10-19.
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By component
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Only bulletins with component: Catalytic converter are shown. Show all
| 17-NA-321 | 2021-04-15. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR. Exhaust Smell and/or Leak with Possible Malfunction Indicator Lamp Illuminated Condition Some customers may comment on an exhaust smell and/or leak with possible malfunction indicator lamp illuminated. During diagnosis, a technician may find DTC P0430 and/or P0420. Cause This may be due to a crack around the catalytic mounting flange. Correction Replace converter assembly with new service part. |
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| 060601010D | 2018-06-04. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR. This informational bulletin explains how the catalytic converters may need an inspection, cleaning or replacement if debris have entered the exhaust system. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.