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OBD II Fault Code

  • OBD II P0543

OBD-II Code Hard or no start in cold weather is defined as a Intake Air Heater "A" Circuit Open

The Intake Air Heater warms the air going into the engine on cold startups. If the engine control module (PCM) detects a failure in the Intake Air Heater or its wiring, it will set code P0543.

Hard or no start in cold weather Symptoms

  • Hard or no start in cold weather

Common Problems That Trigger the P0543 Code

  • Intake air heater
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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