GM Parts Club
Most exhaust and emissions problems announce themselves well before they strand anybody. On a 2017-2026 XT5, 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 catalytic converters.
2. 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 DEF injectors.
3. 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 diesel particulate filters.
4. 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 oxygen sensors.
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 Cadillac OEM parts catalog to shop by vehicle, or search for XT5 catalytic converters to go straight to a part.
Where to Buy
- Genuine Cadillac OEM parts
- Catalytic Converters
- Oxygen Sensors
- Def Injectors
- Diesel Particulate Filters
- Wholesale account setup
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