Engine Intake Air Temperature Sensor Circuit High
Intake air temperature is too high for proper engine performance.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The Engine Control Module (ECM) thinks the air coming into the engine is hotter than it should be, which can mess with power and fuel efficiency.
What the computer is actually seeing
The ECM monitors the intake air temperature via a sensor that typically outputs 0.5 to 4.5 volts, with 0.5 volts indicating -40°C and 4.5 volts indicating 125°C. If the reading exceeds 4.5 volts, the fault triggers.
What a healthy reading looks like
Intake air temperature should typically range from 0°C to 60°C during normal operation, with the sensor output voltage reflecting these temperatures accordingly.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check air intake temperature sensor connector for proper connection and condition. Look for bent pins or corrosion.
- 22. Measure the output voltage of the intake air temperature sensor at normal operating conditions. Expected voltage should be between 0.5 and 4.5 volts.
- 33. Inspect the wiring between the sensor and ECM for any visible damage or shorts.
- 44. If voltage is out of range, replace the sensor. If voltage is correct but code persists, perform an ECM reset and retest.
Common causes
- Faulty intake air temperature sensor
- Wiring issues or damaged connectors
- Engine overheating conditions
- Debris in air intake affecting readings
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
Yes, but you may notice decreased performance and fuel economy. It's advisable to fix it soon.
Will this code come back after I clear it?
It could come back if the underlying issue isn't resolved, like a faulty sensor or wiring problem.
Why does this code sometimes pair with SPN 1264?
SPN 1264 typically indicates a low temperature reading which can often occur when the sensor malfunctions, leading to high and low readings.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →