Intake Air Temperature Sensor 2 Circuit Range/Performance Bank 1
The engine control module detected a malfunction in the Intake Air Temperature (IAT) Sensor 2 circuit, which measures the temperature of incoming air to adjust fuel mixture. This could indicate a faulty sensor, wiring issue, or poor connection affecting the sensor's signal to the PCM.
What You Might Notice
- Check Engine Light (MIL) illuminated
- Possible rough idle or hesitation during acceleration
- Slightly poor fuel economy
- Engine may run lean or rich depending on the fault type
- May have no noticeable symptoms to the driver
Most Common Causes
- 1
Faulty IAT Sensor 2
The intake air temperature sensor has failed internally and is not providing accurate resistance readings to the PCM. This is the most common cause of this code.
- 2
Open circuit in signal or ground wire
A break in the wiring between the sensor and PCM prevents proper signal transmission, causing the module to detect an out-of-range voltage.
- 3
Short to ground on signal circuit
The signal wire is shorted to ground or chassis, causing abnormal voltage readings that the PCM interprets as a circuit malfunction.
- 4
Poor connection or corrosion at sensor or PCM
Loose, corroded, or oxidized connectors at the sensor or PCM create high resistance and intermittent signal loss.
How to Diagnose It
- 1
Check Faulty IAT Sensor 2 — The intake air temperature sensor has failed internally and is not providing accurate resistance readings to the PCM. This is the most common cause of this code.
- 2
Check Open circuit in signal or ground wire — A break in the wiring between the sensor and PCM prevents proper signal transmission, causing the module to detect an out-of-range voltage.
- 3
Check Short to ground on signal circuit — The signal wire is shorted to ground or chassis, causing abnormal voltage readings that the PCM interprets as a circuit malfunction.
- 4
Check Poor connection or corrosion at sensor or PCM — Loose, corroded, or oxidized connectors at the sensor or PCM create high resistance and intermittent signal loss.
How to Fix It
- 1
Replace IAT Sensor 2
Remove the faulty intake air temperature sensor from its location in or near the intake manifold and install a new OEM or quality replacement sensor. Clear the fault code after installation and verify with a test drive.
- 2
Inspect and repair wiring
Visually inspect the signal and ground wires between the IAT Sensor 2 and PCM for damage, breaks, or corrosion. Repair or replace any damaged wiring sections, ensuring proper routing away from heat sources.
- 3
Check and clean connectors
Disconnect the sensor and PCM connectors, clean any corrosion or oxidation with electrical contact cleaner, and reconnect firmly. Ensure proper seating and consider applying dielectric grease to prevent future corrosion.
- 4
Verify PCM ground connections
Check that the PCM has solid ground connections and that the sensor ground wire is properly connected. Poor grounding can cause similar circuit malfunction codes.
Need a deeper diagnosis?
Search for related repair guides or browse by system.