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P0111 is a diagnostic trouble code (DTC) for "IAT sensor circuit range or performance 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 range or performance problem
P0111 is the OBD-II generic code that indicates the engine control module (ECM) has recorded the IAT sensor input go out of the sensors range or the sensor performance was not as the ECM expected.
The IAT sensor range input to the ECM went to -40°F or 240°F indicating a short or open circuit.
The IAT sensor input to the ECM is erratic and not giving a steady stable reading.
Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.
The mechanic will need to do a visual inspection to determine any electrical connector, wiring, or sensor issues.
The technician will scan and document the codes received and view the freeze frame data to see when the code was set.
The codes should then be reset to clear the OBD-II fault codes and retest the vehicle to see if the code comes back.
The mechanic will observe the sensor’s live data on the scanner for temperature output to be within specifications.
If no problems are noted, then the next step for the technician to do is to perform a manufacturer's specific pinpoint tests for the code and repair as needed.
Not doing a visual inspection first
Not following the manufacturer pinpoint test procedure step-by-step and skipping steps
Replacing an IAT sensor before tests indicate a problem
Before installation of the new IAT sensor, not connecting it and viewing the ECM data to see if the temperature output from the sensor is as expected
The P0111 code will cause the engine ECM to go into a failsafe mode.
The failsafe mode may cause excessive fuel consumption, carbon fouling of engine components, and various drive complaints, depending on the manufacturer failsafe mode strategy.
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 P0111 code is often associated with P0112, P0113, and P0114 codes.
Most failures for code P0111 are a harness shorting or a connector corrosion issue.
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.