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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.
Intake Air Temperature (IAT) sensor circuit low input problem
P0112 is the OBD-II generic code that the engine control module (ECM) has recorded the IAT sensor input below the expected sensor range.
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.
Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.
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.
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
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.
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.
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