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2021 BMW I3

42 kWh Single Motor RWDRWDAUTOMATICev
Repairs0Labor371Torque3191Fluid6DTC564Battery0Maintenance0Recalls0
C0340high severityChassis

Active Roll Control System Malfunction

on 2021 BMW i3 42 kWh Single Motor RWD · RWD

What this code means

General fault in the active roll stabilization system that reduces body roll during cornering.

Symptoms

  • Active roll control warning light
  • Increased body roll in corners
  • Stabilizer bar clunking noise
  • Handling reduced

Common causes

  • Active stabilizer bar motor failure
  • Hydraulic valve fault
  • Control module malfunction
  • Stabilizer bar link failure

Diagnostic steps

  1. Scan for specific sub-codes
  2. Test active stabilizer motor or hydraulic valve
  3. Inspect stabilizer bar links
  4. Check module power supply
  5. Monitor system pressure if hydraulic

Repair notes

Diagnose specific active roll control component. System may be hydraulic or electromechanical.

Other Chassis codes on this vehicle

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