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2010 CADILLAC CTS
3.0L V6•AWD•AUTOMATIC•gas
3 active safety recalls on this vehicle — view recalls
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Repairs0Labor991Torque6448Fluid18DTC2446Battery2Maintenance0Recalls3
B0642moderate severityBody

A/C Compressor Circuit

on 2010 Cadillac CTS 3.0L V6 · AWD

What this code means

Malfunction in the A/C compressor electrical control circuit.

Symptoms

  • A/C not cooling
  • Compressor clutch not engaging
  • Compressor clutch always engaged
  • A/C system cycling abnormally

Common causes

  • Faulty compressor clutch coil
  • Compressor control valve failure (variable displacement)
  • Wiring damage
  • Ground circuit issue
  • Clutch air gap incorrect

Diagnostic steps

  1. Test compressor clutch coil resistance
  2. Check clutch air gap
  3. Test control valve (if variable)
  4. Inspect wiring and ground
  5. Measure voltage at clutch connector

Repair notes

Replace compressor clutch coil or adjust air gap. For variable compressors, replace control valve.

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