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2006 GMC CANYON
3.5L I5•4WD•AUTOMATIC•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor511Torque3508Fluid10DTC1916Battery1Maintenance0Recalls4
P0543moderate severityPowertrain

Intake Air Heater A Circuit Open

on 2006 GMC Canyon 3.5L I5 · 4WD

What this code means

The PCM has detected an open circuit in the intake air heater A control circuit. This heater helps warm intake air for cold starting, mainly on diesels.

Symptoms

  • Hard cold starting
  • White exhaust smoke on cold start
  • Check engine light on

Common causes

  • Open intake air heater element
  • Broken or corroded wiring
  • Faulty relay
  • Poor connector contact

Diagnostic steps

  1. Scan for codes and check freeze frame
  2. Inspect heater connector and wiring
  3. Test heater element continuity
  4. Check relay operation and power supply
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