C05F74WD/AWD Range Actuator Control Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- A range actuator drive line sits below its expected voltage, typically because a motor lead is shorted to ground or the driver pulls it down when it should not. In a reversing gear motor each terminal is alternately the high and the low side, so a ground short on either lead shows up depending on shift direction. The TI DRV8873-Q1 is an example of a driver that reports a short to ground separately from overcurrent and open load and shuts the affected half-bridge off. Ford advises in SSM 48300 to inspect Super Duty transfer case connectors for damaged wires before condemning the motor; Magna's patent shows the motor turning a screw and sector shaft to move the range fork, so without drive the fork stays put. No maker documents C05F7; C05F8 is the high-side fault.
- What you may notice
- 4WD service message, range change refused
- Fault may appear only when shifting in one direction
- Blown fuse for the transfer case motor possible
- Likely causes
- LikelyMotor lead chafed through and shorted to the body or transfer case
- PossibleWater or corrosion in the shift motor connector
- PossibleInternal short in the shift motor
- RareFaulty low-side driver in the control module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.