Chassis, generic

C05DB 4WD/AWD Clutch A Actuator Control Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Set when the clutch A actuator line reads too high, typically because it touches battery voltage or because the low-side switch cannot pull it down. For an electromagnetic clutch, Mitsubishi Electric checks for this short with the selector in P or N by comparing the terminal voltages against normal values, then releases the clutch by turning off both drivers. A line stuck at supply can keep a coil partly energized, so on an ITCC-type coupling (current controls torque) the clutch may drag even when open is commanded. Newer BorgWarner couplings instead use a brushless motor with electronics integrated into the actuator unit. No public manufacturer case exists for C05DB; C05DA is the short to ground.

Likely causes

Actuator wire shorted to a supply line in the harness
Output transistor in the AWD module stuck on
Corrosion bridging pins in the actuator connector

Symptoms

  • AWD warning, all-wheel drive disabled
  • Possible binding or tyre scrub in tight turns if the clutch drags

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,500
Time0.5–3 h

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

Parts involved

awd clutch a actuatorawd control module

Related codes

C05D8C05DAC05D9C05EA

References: patents.google.com, jtekt.co.jp, borgwarner.com.