P0112 OBD-II Trouble Code: IAT Sensor Circuit Low Input Problem

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0112 code

P0112 is a diagnostic trouble code (DTC) for "IAT Sensor Circuit Low Input Problem". 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 P0112 DIAGNOSTIC Get a fair and transparent estimate upfront

P0112 code definition

Intake Air Temperature (IAT) sensor circuit low input problem

What the P0112 code means

P0112 is the OBD-II generic code that the engine control module (ECM) has recorded the IAT sensor input below the expected sensor range.

What causes the P0112 code?

If the output voltage is less than 0.18 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets trouble code P0112.

What are the symptoms of the P0112 code?

  • This ECM will turn on the Check Engine Light and go into a failsafe mode.
  • The engine may be hard to start
  • A fuel mileage reduction
  • Exhaust may have black smoke out of the tailpipe on acceleration

Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.

How does a mechanic diagnose the P0112 code?

  • Scans the ECM, documents the codes received, and views the freeze frame data to see the conditions present when the code was set

  • Clears the vehicle of fault codes and the retests the vehicle to see if the code comes back

  • Performs a visual inspection to see if there is a disconnected or loose electrical connector to sensor

  • Observes the sensor’s live data on the scanner while doing a wiggle test for an open circuit in wiring, connections or sensor

If no problems are noted, the mechanic performs manufacturer's specific pinpoint tests for the code and repair as needed.

Common mistakes when diagnosing the P0112 code

  • Not performing visual inspections of connections and wiring

  • Not following the manufacturer pinpoint test procedure step-by-step or skipping steps

  • Not replacing an IAT sensor only when tests indicate a problem

  • Not connecting a new or known good sensor to the harness and viewing the ECM data to see if the temperature output from the sensor is as expected

How serious is the P0112 code?

  • The P0112 code will cause the engine ECM to go into a failsafe mode.

  • The failsafe mode, depending on the manufacturer failsafe mode strategy, may cause erratic drivability symptoms.

  • Driving the vehicle for an extended time with the vehicle in failsafe mode may require additional repairs to remove carbon or repair possible ignition problems.

What repairs can fix the P0112 code?

  • Repairing or replacing the IAT connector
  • Repairing or replacing the wiring as necessary
  • Replacing the IAT with a new sensor

Additional comments for consideration regarding the P0112 code

  • The P0112 code is often associated with P0111, P0113, and P0114 codes.

  • Most intake air temperature sensor problems for code P0112 are failures from damaged or corroded harness connectors and the sensors failing internally.

Need help with a P0112 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.

P0112
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0112 code.

SCHEDULE P0112 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


Related questions

p1112 code and p0112 code on the OBD2 scan tool

Hello, thank you for writing in. Both of the diagnostic troubleshooting codes that you have pulled from the computer relate to the vehicle intake air temperature sensor. The MAP sensor does play a large role in the way the vehicle...

More related articles

P0279 OBD-II Trouble Code: Cylinder 7 Injector Circuit Low
P0279 P0279 code definition Code P0279 is stored by the PCM when it experiences a low-voltage situation that involves the fuel injector for the number seven cylinder. What the P0279 code means Basically, this code means that one of your...
P0680 OBD-II Trouble Code: Cylinder 10 Glow Plug Circuit
P0680 means the system reference voltage allowed by the vehicle’s ECM has exceeded 10% of the allowed variance due to a defective plug, or module.
P2338 OBD-II Trouble Code: Cylinder #3 Above Knock Threshold
P2338 P2338 Code Definition A P2338 code is a generic powertrain code related to an ignition-related problem, such as an engine misfire. It appears when the engine control module (ECM) has received a voltage reading outside the allowed variances from...

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