P0540: Intake Air Heater A Circuit
MediumPowertrainIntake System
What does P0540 mean?
P0540 is a diagnostic trouble code indicating "Intake Air Heater A Circuit". This code relates to your vehicle's intake system and should be diagnosed to determine the root cause. The severity level helps indicate how urgently this should be addressed.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
$100 – $500 AUD
Common causes
- Faulty intake system component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
This code sits in an engine peripheral, typically emissions or forced induction. It will not take braking or steering away, but it can put the car into limp mode, cost you fuel and fail a roadworthy. Book it in rather than clearing it and hoping.
Get a diagnosis for YOUR car
Code P0540 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.