GM Parts Club
Most ignition and engine management problems announce themselves well before they strand anybody. On a 2020-2026 Sierra 2500HD, 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
This one is usually early, which is good news, because it is cheap to fix early. Start by looking at ignition coils.
2. A misfire code that follows the coil when you swap it to another cylinder
By the time this is obvious you are generally replacing more than one part. Start by looking at ignition coils.
3. Fuel economy that drifts down a mile or two per gallon over a few months
This one is usually early, which is good news, because it is cheap to fix early. Start by looking at spark plugs.
4. A rough idle that smooths out above 2,000 rpm
This one is usually early, which is good news, because it is cheap to fix early. Start by looking at ignition coils.
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 GMC OEM parts catalog or search for Sierra 2500HD spark plugs.
Where to Buy
- Genuine GMC OEM parts
- Spark Plugs
- Ignition Coils
- Camshaft Position Sensors
- Crankshaft Position Sensors
- Wholesale account setup
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