P0543

2017-10-10

Description:

  • The fault code P0543 indicates an open circuit in the intake air heater 'A'. The intake air heater is responsible for heating the incoming air before it enters the engine for improved combustion efficiency. An open circuit means that there is a break or interruption in the electrical circuit, preventing the heater from functioning properly.

Possible Symptoms:

  • Check Engine Light illuminated

  • Reduced engine performance and power

  • Longer engine warm

  • up time

  • Potential difficulty in starting the engine in cold weather

  • Increased emissions from the exhaust

  • Inability to use certain features of the vehicle's heating system during cold weather conditions

Possible Causes:

  • Damaged or broken wiring in the intake air heater circuit

  • Faulty intake air heater relay

  • Defective intake air heater element

  • Issues with the engine control module (ECM)

Related Parts:

  • Air Heater: Air heater warms the incoming air if it is cold. Problems lead to poor fuel economy

Possible Solutions:

  • Inspect the wiring harness and connectors for any signs of damage or disconnection

  • repair or replace as necessary

  • Test the intake air heater relay and replace it if found to be faulty

  • Check the intake air heater element for continuity and replace if defective

  • Verify the functionality of the engine control module (ECM) and consider replacement if it is determined to be faulty

Search