C00A3Driveline Control Module Rear Differential Unit A Control Circuit Driver
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C00A3 points to the driver stage inside the driveline module that powers actuator A of the rear differential unit, not to the actuator itself. The module's own transistor monitoring reports something wrong at that output. A Mitsubishi Electric patent illustrates the principle on an electromagnetic clutch: a PWM high-side and a low-side transistor feed the coil, the filtered terminal voltages are checked with the selector in P or N, and if they deviate from normal both transistors are switched off so the clutch opens. Modern H-bridge drivers such as TI's DRV8873-Q1 separately flag overcurrent, short to battery or ground, open load and overtemperature. On hydraulically actuated twin-clutch units, a dedicated ECU drives solenoid valves instead. No manufacturer publishes a C00A3 case; actuator A's own codes are C0095 and C0096.
- What you may notice
- Rear clutch released, AWD inactive
- AWD warning in the instrument cluster
- Likely causes
- LikelyShort to ground or battery in the actuator A supply lines
- PossibleActuator A motor or coil drawing excessive current (binding, winding short)
- RareOutput stage in the module overheated or defective
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.