P0112 - Intake Air Temperature Sensor 1 Circuit Low Bank 1
P0112 is a generic powertrain diagnostic trouble code indicating Intake Air Temperature Sensor 1 Circuit Low Bank 1. It relates to the Fuel & Air Metering system.
DTC Breakdown (SAE J2012)
| System | Powertrain (P) |
| Type | Generic |
| Subsystem | Fuel & Air Metering |
| Fault Index | 12 |
| Standard | SAE J2012 / ISO 15031-6 |
What does diagnostic code P0112 mean?
The powertrain control module logged P0112 due to a low input fault in the IAT sensor circuit.
Severity Level & Driveability Details
Severity: Moderate
The engine runs in a default backup mode, which can cause poor fuel control and potential engine stalling.
Common Symptoms of P0112
- Engine hesitation, stumbling, or stalling.
- Rough running at idle.
- Lack of power on acceleration.
- Check engine light illuminated.
Typical Causes for P0112
- Dirty or contaminated IAT sensor elements.
- Intake air leaks or cracked intake boot downstream of the sensor.
- Failed IAT sensor assembly.
- Damaged wiring harness or loose electrical plug for the sensor.
Diagnostic and Troubleshooting Steps
Inspect intake tubes for leaks. Clean the sensor elements using a specialized electronic cleaner spray. Monitor live sensor readings on a scan tool while revving the engine.
Typical Repairs and Fixes
- Cleaning the IAT sensor elements.
- Replacing the cracked intake air tube.
- Replacing the IAT sensor assembly.
- Repairing damaged sensor wiring.
Sensor Location & Parts Involved
The IAT sensor is located in the intake air ducting, between the air filter box and the throttle body.
Clearing Code & Recurrence
Clear the code with a scanner to verify that the sensor readings rise smoothly.
Emissions & Smog Inspection Impact
Causes incorrect fuel-air ratios, increasing unburned tailpipe emissions.
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Related Diagnostic Codes
Sources & References
This diagnostic guide is compiled and verified against the following authority sources:
- EPA Technical Standards
- SAE J2012 reference guide
Frequently Asked Questions about P0112
What does the IAT sensor 1 circuit low input code P0112 mean?
The powertrain control module logged P0112 due to a low input fault in the IAT sensor circuit.
Is it safe to drive with the IAT sensor 1 circuit low input code P0112 active?
Yes, but drive carefully to avoid stalling.
How much does it cost to repair a IAT sensor 1 circuit low input code P0112 fault?
Cleaning the sensor is cheap ($15). A new IAT sensor is $120-$250, and labor is $70-$150.
What are the common causes of the IAT sensor 1 circuit low input code P0112?
Trigger conditions for the IAT sensor 1 circuit low input code P0112 include: Dirty or contaminated IAT sensor elements., Intake air leaks or cracked intake boot downstream of the sensor., Failed IAT sensor assembly..
Can I clear the check engine light for IAT sensor 1 circuit low input code P0112?
Clear the code with a scanner to verify that the sensor readings rise smoothly.
Will the IAT sensor 1 circuit low input code P0112 cause an inspection failure?
Causes incorrect fuel-air ratios, increasing unburned tailpipe emissions.