C0390 - Chassis Fault Code C0390 - Fyrhjulsdrift (AWD/4WD) & Fördelningslåda
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System
Chassis (Brakes, Steering, Suspension)
Related Fault Codes
Technical Description
DTC C0390 is set when the Transfer Case Control Module (TCCM) or AWD control module detects a circuit fault, current feedback deviation, or out-of-range condition on the transfer case clutch/differential lock actuator coil circuit. The module monitors the high-side and low-side PWM drivers using internal current shunt sensing. If the measured current fails to match the target duty-cycle current profile (open circuit, short-to-ground, or internal winding degradation), the code is stored and AWD engagement is disabled.
Possible Causes
1. Korrosion eller stiftglapp i kabelstammens kontaktstycke vid fördelningslådan/bakaxeln.
2. Internt lindningsfel eller termisk kortslutning i den elektromagnetiska kopplingsspolen/aktuatorn.
3. Skavd kabelstam mellan TCCM och kopplingsaktuator (kortslutning mot chassi).
4. Bränt slutsteg (MOSFET/H-brygga) eller defekt strömavkänningskrets i TCCM-styrdonet.
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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