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2000 BMW 528I
2.8L I6 M52•RWD•AUTOMATIC•gas•M52B28
1 active safety recall on this vehicle — view recalls
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Repairs0Labor495Torque3158Fluid8DTC1997Battery1Maintenance0Recalls1
P0647low severityPowertrain

A/C Clutch Relay Control Circuit High

on 2000 BMW 528i 2.8L I6 M52 · RWD

What this code means

The PCM detected a high voltage condition in the A/C compressor clutch relay control circuit. This may keep the A/C compressor from engaging correctly.

Symptoms

  • No A/C cooling
  • Compressor clutch not activating
  • Check engine light on

Common causes

  • Open in control circuit
  • Short to voltage in wiring
  • Faulty A/C clutch relay
  • PCM driver failure

Diagnostic steps

  1. Read stored codes
  2. Check circuit for open or short to power
  3. Test relay coil resistance
  4. Verify PCM output signal
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