GM Parts Club
Most exhaust and emissions problems announce themselves well before they strand anybody. On a 2020-2024 CT4, these are the ones worth acting on.
1. A check engine light that appears after fueling and clears itself
By the time this is obvious you are generally replacing more than one part. Start by looking at DEF injectors.
2. A P0420 or P0430 efficiency code
It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at DEF injectors.
3. An exhaust tick on cold start that quiets as the manifold expands
This one is usually early, which is good news, because it is cheap to fix early. Start by looking at DEF injectors.
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 diesel particulate filters.
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.
Shops and fleets can set up wholesale pricing at gmpartsclub.com/wholesale. Everyone else can start at our Cadillac OEM parts catalog or search for CT4 catalytic converters.
Where to Buy
- Genuine Cadillac OEM parts
- Catalytic Converters
- Oxygen Sensors
- Def Injectors
- Diesel Particulate Filters
- Wholesale account setup
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