GMC Hummer EV Exhaust and Emissions Warning Signs You Should Not Ignore

Most exhaust and emissions problems announce themselves well before they strand anybody. On a 2022-2024 Hummer EV, these are the ones worth acting on.

1. An exhaust tick on cold start that quiets as the manifold expands

It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at diesel particulate filters.

2. A P0420 or P0430 efficiency code

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at diesel particulate filters.

3. A diesel that regenerates far more often than it used to

By the time this is obvious you are generally replacing more than one part. Start by looking at oxygen sensors.

4. A check engine light that appears after fueling and clears itself

It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at DEF injectors.

What to Do Next

Not scheduled. Converters are warranted separately under federal emissions rules, so check coverage before you buy.

Emissions equipment varies by state of original sale on some model years.

Ordering is easiest if you have the VIN in front of you. Head to our GMC OEM parts catalog to shop by vehicle, or search for Hummer EV catalytic converters to go straight to a part.