GM Parts Club
Most exhaust and emissions problems announce themselves well before they strand anybody. On a 2020-2024 Sierra 3500HD, these are the ones worth acting on.
1. A check engine light that appears after fueling and clears itself
This one is usually early, which is good news, because it is cheap to fix early. Start by looking at DEF injectors.
2. A P0420 or P0430 efficiency code
This is the symptom people put off longest and regret most. Start by looking at oxygen sensors.
3. An exhaust tick on cold start that quiets as the manifold expands
This is the symptom people put off longest and regret most. Start by looking at oxygen sensors.
4. A diesel that regenerates far more often than it used to
It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at catalytic converters.
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 Sierra 3500HD catalytic converters to go straight to a part.
Where to Buy
- Genuine GMC OEM parts
- Catalytic Converters
- Oxygen Sensors
- Def Injectors
- Diesel Particulate Filters
- Wholesale account setup
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