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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
C0405low severityChassis

ACC Sensor Blocked

on 2010 Cadillac CTS 3.0L V6 · AWD

What this code means

The adaptive cruise control sensor reports its view is obstructed.

Symptoms

  • ACC temporarily unavailable message
  • Sensor blocked warning on dash
  • ACC disengages in bad weather

Common causes

  • Mud, snow, or ice covering sensor area
  • Aftermarket grille or bumper cover blocking sensor
  • Heavy rain or fog
  • Damaged sensor cover or radome

Diagnostic steps

  1. Clean radar sensor cover or camera lens
  2. Inspect bumper fascia sensor opening
  3. Check for aftermarket parts blocking sensor
  4. Verify no damage to sensor radome
  5. Test in clear weather to confirm resolution

Repair notes

Clean sensor area thoroughly. Remove any aftermarket obstructions. Replace damaged radome.

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