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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0112 DIAGNOSTIC 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0112 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

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.

Check Engine Light
P0112
trouble codes

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0112 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,484

Rating Summary
3,176
153
40
23
92
3,176
153
40
23
92

Richard

10 years of experience
415 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Michael

13 years of experience
372 reviews
Michael
13 years of experience
Mike was an absolute professional when he arrived. He walked me thru the whole process of my repairs and also made good recommendations for preventive issues. His mechanical knowledge and good customer services was a breath of air and greatly appreciated :-)
2007 CHEVROLET AVALANCHE - CHECK ENGINE LIGHT IS ON INSPECTION - MARIETTA, GEORGIA

Rodrigo

10 years of experience
85 reviews
Rodrigo
10 years of experience
Rodrigo was exactly on time, very professional and friendly. He assessed my car, let me know the exact problem when a previous mechanic from a shop in my area was unable to. I felt he was very honest and sincere letting me know the level of urgency that I deal with the issue. Absolutely no pressure. I will absolutely use Rodrigo the next time I need anything to do with my car and will tell everyone about him. This is such a great service, I will never go to another mechanic again. It is so convenient. I couldn’t be happier. :)
2013 SMART FORTWO - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Great service and was very helpful on what maintenance my vehicle needed and what to expect in the future. Would definitely recommend to anyone and will.
2004 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - LOS ANGELES, CALIFORNIA

More related articles

How Long Does a Fuel Filler Neck Last?
Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...

Related questions

Q: gas light loose and check engine light comes on I replaced gas cap and the issue still happens

The gas cap is the most common source of evaporative emissions, which would be a reason the check engine light would come on. The evaporative emissions system is designed to limit the evaporation of fumes from the fuel in your...

Q: 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...

Q: what causes a P0174 bank2 combustion too lean

You will need to have the system inspected thoroughly to see why the vehicle is going lean. The possible causes are that you are loosing fuel pressure or fuel volume. If fuel pressure gets too low it will cause the...

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.

1-800-701-6230 · hi@yourmechanic.com