Powertrain, generic · Fuel and air metering, auxiliary emission controls

P005D B Camshaft Profile Actuator A Control Stuck On Bank 2

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

The camshaft profile actuator A switches the exhaust camshaft (camshaft B) on bank 2 between fixed cam profiles, usually a low-lift base profile and a high-lift profile. In most designs the unactuated state ("off") is the base profile; which profile counts as "on" is defined by the manufacturer. The control module does not need a position sensor to check the switchover: it detects the actual profile indirectly, for example from oil pressure in the switching gallery, intake pressure per cylinder or crankshaft speed fluctuations. This code is set when the base profile is commanded but the camshaft stays on the switched profile. Large lift and long opening at low engine speed cause rough idle and poor low-speed running. Bank 2 exists only on V and boxer engines.

Likely causes

Profile switching solenoid stuck open, oil pressure is not released

Locking pin does not return (weak spring, burr or dirt)

Oil pressure too high or drain from the switching gallery blocked

Sliding cam piece stuck in the high-lift position

Symptoms

Check engine light on
Rough idle and jerking at low engine speed
Poor running when cold
Misfire codes possible

Repair estimate

DifficultyMediumDIY possible

Parts and labour€80–3,500

Time0–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

camshaft profile actuator exhaust bank2engine oilvalve train

References: law.cornell.edu, patents.google.com, patents.google.com, patents.google.com.