# P0421 on the 2018 Chevrolet Equinox

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0421

- [10154582](https://open.wenmarpro.com/bulletins/10154582), 2019-03-18: This Preliminary information communicates that a Engine Control Module \(ECM\) service update calibration for P0421.
- [10154292](https://open.wenmarpro.com/bulletins/10154292), 2019-03-11: 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.
- [10143742](https://open.wenmarpro.com/bulletins/10143742), 2018-08-20: 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.
- [10137585](https://open.wenmarpro.com/bulletins/10137585), 2018-05-21: 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.