First time posting. FWIW, this worked for me (brilliant insight by lowvo, BTW). 2009 TDI 86K miles. Intermittent P2015 after a few weeks became solid CEL. Flap motor appeared dead through VCDS but if I held the actuator arm about 30 degrees from resting it would move during VCDS output tests. First loosen flap motor unit for better access to remove arm spring. I used forceps clamped to the spring so I wouldn't lose it. Verified myself.....arm in wrong start position means actuator fails self-test when the car is started hence the instant/persistent CEL. Didn't do any mods relating to e-clip solution.