[AlfistoSteve]

Remove the engine cover. Find the two small cylinders just to the left of the #1 spark plug. They are called the intake & exhaust camshaft position (CMP) actuator solenoids. I recommend that you replace them both. But if you choose, you can just replace the intake actuator for a 10 or 11 code or the exhaust actuator for a 13 or 14 code. There are no aftermarket versions available...just the OEM ACDelco. Either get from a dealer or (probably cheaper) online (though a bit harder to find online than at a dealer). Just remove the hold-down bolts & pull up on the actuators. Put engine oil on the new o-rings & don't over-torque the hold-down bolts (torque spec is only 7 ft-lbs). The actuators are keyed differently (& have different part numbers) so you can't interchange them.

Part #
Intake: 12646783 ss by 12615873
Exhaust: 12646784 ss by 12655421

http://www.chevymalibuforum.com/forums/attachment.php?attachmentid=2521&stc=1&d=1352699374

Just had this same problem on our 2009 Malibu.

I changed exhaust cam solenoid now to see if check engine light (CEL) (MIL) stays out after I reset it.

• Point of information 12646784 number has now been superceded by 12655421
• Point of information 12646783 number has now been superceded by 12615873

Solenoid valve was listed for 56.14 but with my discount I got it for $45.46 at Chevy dealer.

OReilly's had it listed for 49.99 under Dorman 917-216 number but did not have it in stock. Amazon lists Dorman valve for $24.75 on sale.