GM Engine Cylinder Deactivation Solenoid – 12580901 – For Chevrolet GMC 2005-2014

If you have a GM truck or SUV with Active Fuel Management (AFM) from the mid-2000s to 2014, this is the solenoid that controls it.

It's a used OEM General Motors part, number 12580901.

It also crosses to 12571609, 12699740, and others.

Quick heads-up: the seller notes no warranty and doesn't guarantee it, so it's sold as-is for parts or testing.

If you're troubleshooting a misfire or AFM issue, this might be the culprit.