C009C4WD/AWD Rear Differential Unit Actuator A Position Sensor Correlation
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Each of the three position channels of actuator A may look electrically fine, yet together they make no sense: a combination that cannot occur, a sequence that skips states or runs against the commanded direction. With 120-degree spacing the patterns 000 and 111 are invalid, as a Woodward patent notes. Ford is the only maker with a public case: SSM 50188 reports C009C in the AWD module of 2021 Bronco Sport vehicles alongside cluster messages: Service AdvanceTrac, unavailable Hill Start Assist or Pre-Collision Assist, a 4WD Malfunction notice and Reduced Power. Ford blames connector C413 being only partly engaged or having loose terminals, which should be ruled out before a new rear drive unit is fitted; otherwise the workshop manual section 307-07A applies. Hyundai Kefico separates open from shorted lines via all-low or all-high readings.
- What you may notice
- 4WD Malfunction message and AWD switched off
- Service AdvanceTrac, hill start assist or pre-collision assist unavailable (Ford)
- Reduced Power message
- Likely causes
- LikelyRear drive unit connector not fully seated or loose pins (Ford C413)
- PossiblePoor shared sensor ground or supply corrupting all three channels
- PossibleInternal sensor or magnet fault in the rear drive unit motor
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.