Skip the auto shop - Our mechanics make house calls

P0542 OBD-II Trouble Code: Intake Air Heater "A" Circuit High

check engine light

P0542 code definition

The P0542 Trouble Code indicates that there is an issue with the intake air heater “A” circuit high.

What the P0542 code means

The code means that the powertrain control module has found that the input voltage reading from the intake air heater circuit is not normal when compared with the manufacturer’s guidelines. In some cases, it might take up to three drive cycle failures before the Check Engine lamp comes on.

What causes the P0542 code?

The following are some of the most common causes of the P0542 code:

What are the symptoms of the P0542 code?

Drivers will not notice that there is any issue with the vehicle when this code is present. However, it becomes a stored code. The only indication that there is anything wrong with the vehicle would be the Check Engine Light that comes on and stays on.

How does a mechanic diagnose the P0542 code?

When there is a P0542 code, the mechanic will utilize an OBD-II scanner and connect it to the vehicle’s computer system. It will then gather data that the computer has stored, which can make the diagnosis easier for the mechanic. The mechanic will then want to reset the codes. They then take the vehicle for a test drive and see if the light returns. If it does, they know that there is an issue they need to repair. If it doesn’t, then it generally means there is nothing wrong with the vehicle.

Common mistakes when diagnosing the P0542 code

Sometimes, after replacing an air filter, or when removing the air cleaner box to repair it, the intake air temperatures are not reconnected. If this happens, it can cause the code to appear, but the driver might believe that the problem is related to the air filter rather than the sensors.

How serious is the P0542 code?

When you have the P0542 code appear on your vehicle, it doesn’t tend to be very serious. Your vehicle will still drive fine, and you will not likely notice any difference in the performance. The only indication that something is wrong is the Check Engine Light. This doesn’t mean that you should ignore the problem though. You will still want to have the sensors fixed so that the vehicle can continue to run properly.

Additional comments for consideration regarding the P0542 code

Just because the vehicle is still driving well doesn’t mean that you can ignore the warning lights that come on. They are there to tell you that something is wrong with the vehicle so you can take it to a mechanic and have it repaired properly.

Need help with a P0542 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...


Related questions

Q: Car stalling at random, could be an electrical problem?

Generally, when the car is running consistently and on all cylinders, when stalling it is often times a fuel supply issue (or in some cases indirectly related to electrical - i.e. bad connection or pulse to the fuel injectors). I...

Q: Check engine light / truck stalled on me today and wouldnt start

As you may know the oxygen sensors which are part of your emissions system read exhaust gases to determine whether or not the appropriate amount of oxygen is present in the exhaust. Based upon this reading, this information is relayed...

Q: What means error fault code p1978

The trouble code you listed is a manufacturer specific code, designated by the P1xxx. I have searched my files and cant find that DTC trouble code. Can you please verify that the code is P1978? However, if you'd like to...