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

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Cost of diagnosing the P0542 code

P0542 is a diagnostic trouble code (DTC) for "Intake Air Heater "A" Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate* Credit towards follow-up repair Earliest Availability
Ford $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

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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.

Check Engine Light
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P0542

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Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
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William

23 years of experience
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William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
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Dan

40 years of experience
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Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
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Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


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