Back to 2013 BMW M3 E90

2013 BMW M3 E90

4.0L V8 S65RWDDCTgas
Repairs0Labor499Torque3925Fluid7DTC909Battery0Maintenance0Recalls0
B0640moderate severityBody

A/C Compressor Clutch Relay Circuit

on 2013 BMW M3 E90 4.0L V8 S65 · RWD

What this code means

Malfunction in the A/C compressor clutch relay circuit. The relay controls engagement of the A/C compressor.

Symptoms

  • A/C not blowing cold air
  • Compressor clutch not engaging
  • A/C works intermittently
  • Relay clicking

Common causes

  • Faulty A/C clutch relay
  • Relay control circuit issue
  • Low refrigerant triggering cutoff
  • BCM or PCM relay driver failure
  • Corroded relay socket

Diagnostic steps

  1. Check A/C clutch relay
  2. Test relay with jumper wire
  3. Check refrigerant pressure
  4. Test relay control signal from PCM/BCM
  5. Inspect relay socket for corrosion

Repair notes

Replace A/C clutch relay. If relay keeps failing, check compressor clutch current draw.

Other Body codes on this vehicle

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