GM Parts Club
Most ignition and engine management problems announce themselves well before they strand anybody. On a 2020-2025 CT4, these are the ones worth acting on.
1. A misfire code that follows the coil when you swap it to another cylinder
This is the symptom people put off longest and regret most. Start by looking at ignition coils.
2. A rough idle that smooths out above 2,000 rpm
It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at spark plugs.
3. A check engine light that flashes under load, which means raw fuel is going into the converter
This is the symptom people put off longest and regret most. Start by looking at spark plugs.
4. Fuel economy that drifts down a mile or two per gallon over a few months
By the time this is obvious you are generally replacing more than one part. Start by looking at spark plugs.
What to Do Next
Iridium plugs on most modern GM engines are a 90,000 to 100,000 mile item. Coils are replaced on failure, not on a schedule.
The same nameplate can have three different engines in one model year. VIN is the only reliable way to get the right plug.
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 spark plugs.
Where to Buy
- Genuine Cadillac OEM parts
- Spark Plugs
- Ignition Coils
- Camshaft Position Sensors
- Crankshaft Position Sensors
- Wholesale account setup
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