P0540

2017-10-10

Description:

  • The fault code P0540 indicates that there is an issue with the circuit that controls the intake air heater for bank A. This may cause issues with starting the engine, reduced engine power, or poor fuel economy.

Possible Symptoms:

  • Difficulty starting the engine in cold weather

  • Reduced engine power or acceleration

  • Poor fuel economy

  • Illuminated check engine light

Possible Causes:

  • Failed intake air heater relay

  • Faulty wiring or connections in the circuit

  • Loose or corroded electrical connections

  • Failed intake air temperature (IAT) sensor

Related Parts:

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

Possible Solutions:

  • Replace the intake air heater relay

  • Check and repair any damaged wiring or connections

  • Tighten or clean any loose or corroded electrical connections

  • Replace the intake air temperature (IAT) sensor if necessary

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