Chassis, generic

C05F9 4WD/AWD Range Actuator Temperature Too High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The controller has measured or estimated that the range actuator motor is too hot and blocks further shifts until it cools. Most designs model temperature from motor activity; a Denso patent for a similar shift actuator adds a fixed increment per motor start, lets the estimate decay over time and limits the motor above a protection value of 137 degrees C in its example. Ford TSB 22-2136 for 2021–2022 Bronco names C05F9:19 together with C05D9:99 in the AWD module, with the wrench lamp on and 4WD off, linked to low battery charge: test the battery, clear codes and shift through 2H, 4H, 4A and 4L. Its headline and the follow-up 22-2447 only list C05D9, so the C05F9 entry may be a typo. Stellantis reports motor overheating as its own C1444-98.

Likely causes

Many range shifts in a short time, motor protection active
Low battery charge prolongs motor run time and current
Stiff shift mechanism or blocked shift loads the motor
Worn shift motor drawing excess current

Symptoms

  • Message that 4WD is overheated or temporarily unavailable
  • Range shifts refused until the system cools
  • Wrench or 4WD service lamp on

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–900
Time0.2–3 h

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

Parts involved

range actuatortransfer case control module

Related codes

C05FAC05F6C05DC

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