Cadillac XT6 Ignition and Engine Management: 4 Symptoms Worth Taking Seriously (2020-2023)

Most ignition and engine management problems announce themselves well before they strand anybody. On a 2020-2023 XT6, these are the ones worth acting on.

1. A check engine light that flashes under load, which means raw fuel is going into the converter

It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at spark plugs.

2. A misfire code that follows the coil when you swap it to another cylinder

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at camshaft position sensors.

3. 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 ignition coils.

4. Fuel economy that drifts down a mile or two per gallon over a few months

It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at camshaft position sensors.

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.

If you are not sure which version fits your build, send us the VIN and we will confirm before anything ships. Shop our Cadillac OEM parts catalog or search for XT6 spark plugs.