Powertrain
generic / SAE
P0542
Intake Air Heater A Circuit High
Intake Air Heater A Circuit High: the signal voltage is above the expected range. Used on diesel and some petrol engines for cold-start emissions and starting reliability.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 42
Possible causes
- Circuit shorted to power high
- Ground open medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–500 €
- Estimated time: 0.5–2 h
- Component: intake air heater
- Component: heater wiring
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012