Chassis, generic

C05F8 4WD/AWD Range Actuator Control Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

A range actuator drive line carries more voltage than the controller expects, for example from a short to battery voltage or because a low-side switch no longer pulls the line down. The risk is a motor that runs or is braked when it should be idle, or a driver that cannot complete a commanded direction. The TI DRV8873-Q1 lists short to battery as its own protection case and disables the output that sees it. Magna drives the range shift motor with pulse width modulation and controls speed, direction and revolutions per shift, which presumes both motor leads can be switched cleanly. Stellantis bulletin 08-237-23 shows how many transfer case codes an unseated shift motor connector can trigger at once. No maker documents C05F8 itself; C05F7 covers the ground side.

Likely causes

Motor lead shorted to a battery-fed wire
Low-side switch in the control module failed open
Corrosion bridging pins in the shift motor connector

Symptoms

  • 4WD service message, range shift disabled
  • Shift motor may hum or run unexpectedly
  • Transfer case remains in the last selected range

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

range actuatortransfer case control module

Related codes

C05F5C05F6C05F7

References: ti.com, patents.google.com, static.nhtsa.gov.