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Service bulletins for the 2018 Chevrolet Equinox

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.

1338 on file from NHTSA, as of 2026-10-19.

About P0421 on the 2018 Chevrolet Equinox: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: P0421 are shown. Show all

Bulletins, newest first
PIP56152019-03-18. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates that a Engine Control Module (ECM) service update calibration for P0421.
PIP5615A2019-03-11. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates that a Engine Control Module (ECM) service update calibration for P034A, P0421, P050F, P059F, P111E, P11DC, P122D, P1488, P220B, P22FE, P2457, P2463, P2BAA.
182092018-08-20. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR; ENGINE. 18209 - Service Update. Certain vehicles equipped with a 1.6L diesel engine (RPO LH7), may have been built with an improper alignment of the clamp/gasket assembly connecting the turbocharger to the catalytic converter. This condition may cause a diesel exhaust leak and/or smoke from the underhood area of the vehicle. In addition, a check engine indicator may set with diagnostic trouble code P0421. Dealers are to inspect and replace the turbocharger to catalytic converter clamp/gasket as necessary.
18NA1202018-05-21. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This technical bulletin provides a procedure to reposition the exhaust clamp to correct a condition of Exhaust Smell in Cabin and/or DTC P0421 Set due to a miss installed clamp.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.