P0543 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0543 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0543 code.

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