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

P001D A Camshaft Profile Actuator A Control Circuit/Open Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

A camshaft profile actuator switches the intake camshaft (camshaft A) on bank 2 between two or more fixed cam profiles with different valve lift and duration, for example by shifting a cam piece axially or by locking rocker arms or tappets with oil pressure. Unlike a camshaft phaser it does not shift the timing continuously. The second letter "A" in the title numbers the actuator on this camshaft. This code is set when the control circuit of the actuator is open: no current flows when it is driven, because of a broken wire, an unplugged connector or an open coil. The engine usually stays on one profile, typically the base profile with low lift. Some manufacturers report these faults with their own codes instead. Bank 2 exists only on V and boxer engines.

Likely causes

Connector at the actuator corroded, oil-soaked or loose
Wire broken, e.g. at the valve cover
Actuator coil open
Output driver in the engine control module faulty

Symptoms

  • Check engine light on
  • Less power at high engine speed because the profile does not switch
  • Higher consumption or uneven part-load running, depending on the profile
  • Engine speed may be limited

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–500
Time0.5–2.5 h

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

Parts involved

camshaft profile actuator intake bank2camshaft profile actuator wiringengine control module

Related codes

P001EP001FP001AP002DP003E

References: law.cornell.edu, en.wikipedia.org, audi-technology-portal.de, en.wikipedia.org.