GM Parts Club
Most exhaust and emissions problems announce themselves well before they strand anybody. On a 2020-2024 CT5, 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 catalytic converters.
2. 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.
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 P0420 or P0430 efficiency code
By the time this is obvious you are generally replacing more than one part. 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.
We are a factory GM dealer, not a reseller, so what you order is the same part the service drive installs. Browse our Cadillac OEM parts catalog or search for CT5 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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