Engine Control Module (ECM) / Powertrain Control Module (PCM) Diesel Intake Air Temperature Sensor Fault
Fault detected in the diesel intake air temperature sensor circuit.
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What it means (plain English)
The truck's engine computer isn't getting a proper reading from the intake air temperature sensor, which helps adjust the fuel mixture for optimal performance. This usually means the sensor or its wiring is damaged.
What the computer is actually seeing
The ECM/PCM expects a voltage signal from the intake air temperature sensor that matches the current air temperature. If the voltage is too low or high (typically less than 0.5V or more than 4.5V), it triggers this code.
What a healthy reading looks like
The intake air temperature sensor should normally output a voltage between 0.5V to 4.5V, based on air temperatures from -40°F to 257°F (-40°C to 125°C).
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. Inspect the intake air temperature sensor wiring and connectors for visible damage or corrosion. Ensure connections are secure.
- 22. Check the sensor's voltage with a multimeter. If the voltage is outside the 0.5V to 4.5V range at acceptable temperatures, replace the sensor.
- 33. If the sensor is functional, look for short circuits or breaks in the wiring harness leading to the ECM/PCM. Repair any issues found.
- 44. Clear the code and conduct a road test. If the code returns, further diagnose the ECM/PCM for faults.
Common causes
- Faulty intake air temperature sensor
- Damaged wiring or connectors
- Corroded electrical connections
- Short or open circuit in the sensor circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but you may notice a drop in engine performance or fuel efficiency. Fix it soon.
Will this code come back after clearing it?
If the underlying issue isn’t fixed, yes, it will likely return.
Why does this code pair with other codes?
These codes often relate to similar functions; issues in the intake air system can cause multiple sensor faults.
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