P1112 OBD-II Trouble Code: Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P1112 code

P1112 is a diagnostic trouble code (DTC) for "Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P1112 DIAGNOSTIC Get a fair and transparent estimate upfront

P1112 definition

A P1112 trouble code is related to a vehicle’s intake air temperature sensor that measures the air entering the engine to adjust the fuel and cooling system in order to maintain a normal operating temperature threshold.

What the P1112 code means

P1112 is a OBD-II manufacturer-specific code for a voltage issue regarding the signal sent to the engine computer from the intake air temperature (IAT) sensor. The sensor contains a semiconductor device that changes resistance based on air temperatures coming into the intake manifold. The computer monitors voltage changes from the resistance of the sensor, and if the temperature is too high, the voltage signal will drop below the manufacturer’s threshold and trigger a P1112.

What causes the P1112 code?

The most common causes for a P1112 are:

  • Faulty intake air temperature sensor
  • Faulty intake air temperature sensor wiring/electrical connectors
  • Faulty engine computer computer

What are the symptoms of the P1112 code?

Symptoms of a bad or failing intake air temperature sensor range from a lack of power, trouble with cold starts, and decreased fuel economy. However, some P1112 codes may result in no noticeable symptoms other than a check engine light.

How does a mechanic diagnose the P1112 code?

Before troubleshooting with a OBD-II scanner, your mechanic will visually inspect the sensor and associated wiring, looking for any obvious damages. If the sensor and wiring are intact, they will then connect the scanner to the vehicle and monitor the reading from the IAT. At cold start, it should roughly match the coolant reading. Your mechanic will need to test drive the vehicle to get it up to operating temperature and ensure the IAT reading is indeed too high (low voltage).

Common mistakes when diagnosing the P1112 code

Because all P1XXX codes are manufacturer specific, it’s critical to have any code read by a professional-grade OBD-II scanner to ensure you’re fixing the correct problem. For example, a P1112 code in a Fiat is for the control fuel pressure system and one for a Daewoo is for the MAP sensor.

How serious is the P1112 code?

A faulty IAT sensor can cause a variety of unsavory driving characteristics, making it fairly serious for you to correct a P1112 as quickly as possible.

What repairs can fix the P1112 code?

The most common repairs for a P1112 are as follows:

Additional comments for consideration regarding the P1112 code

All P1112 codes that deal with the intake air temperature sensor are for Acura, Citroen/Peugeot, Ford, General Motors, Isuzu, Jaguar, Mazda, and Mercedes vehicles.

Need help with a P1112 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.

trouble codes
Check Engine Light
P1112

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P1112 code.

SCHEDULE P1112 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,189

Rating Summary
4,783
198
50
27
131
4,783
198
50
27
131

Kenneth

7 years of experience
6 reviews
Kenneth
7 years of experience
Kia Sedona - Check Engine Light is on - Pittsburgh, Pennsylvania
Kenneth is clearly a first-rate mechanic. He thoroughly inspected our vehicle and found that the engine light was on because of a crack in the filler neck hose.

Rigoberto

10 years of experience
731 reviews
Rigoberto
10 years of experience
Jeep Wrangler - Check Engine Light is on - Arlington Heights, Illinois
This is my first time using Your Mechanic. Rigoberto arrived earlier than the appointment time. He was very knowledgeable, helpful and answered all my questions.

Jason

14 years of experience
48 reviews
Jason
14 years of experience
Hyundai Sonata - Check Engine Light is on - Bellerose, New York
Jason was a pleasure to work with. He went above and beyond on my car and it was very much appreciated. Jason worked on my car for 4 days and he was very professional and punctual. He educated me on the health of my car. He was fair and flexible with his quotes. I highly recommend Jason and will be utilizing his services again.

Alex

5 years of experience
45 reviews
Alex
5 years of experience
Ford F-150 - Check Engine Light is on - Alameda, California
show up on time, great guy, very knowledge on what he's doing, would recommend his work to everyone, keep up the good work thank you.


More related articles

Related questions

Flashing check engine light - 2007 Ford Edge

When a Ford vehicle displays a flashing Check Engine Light on the dashboard, this is an indication that your engine has a misfire. I would first recommend having your vehicle scanned for trouble codes with an OBD-2 scanner. This will...

I need to know the diagnostic procedure for dtc p0717. Want to test wires before taking out transmission

If the sensor only has two wires, it is a reluctant AC sensor. If the sensor has three wires then it is a hall effect DC sensor. A two wire sensor will produce a sine wave signal: '()(-)()(-)(_)' or steady...

Coolant leak causing overheating.

The service engine light would have to be scanned to find the cause of it being on. The overheating can be caused by the thermostat stuck or the fan control system problem. Since the engine overheated the loss of coolant...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com