Ambient Air Temperature Sensor 2
Fault with Ambient Air Temperature Sensor 2 reading.
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What it means (plain English)
The engine control module (ECM) uses Ambient Air Temperature Sensor 2 to measure the outside air temperature, and if it reads out of range, there’s a problem with this sensor or its wiring.
What the computer is actually seeing
The ECM expects a linear voltage between 0.5V (approximately -40°C) and 4.5V (approximately 125°C) from the Ambient Air Temperature Sensor 2, corresponding to the sensed temperature.
What a healthy reading looks like
0.5V to 4.5V under normal operating temperatures, about 1.5V for a typical ambient temperature of 20°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.
- 1Check the wiring and connector at the Ambient Air Temperature Sensor 2 for damage or corrosion. Repair as necessary.
- 2With the ignition on, measure the voltage at the connector of Ambient Air Temperature Sensor 2 while comparing it to the expected values.
- 3If the voltage is out of the expected range (0.5V - 4.5V), replace the sensor and retest.
- 4If the voltage is within the expected range but problems persist, check for issues with the ECM or other related sensors.
Common causes
- Faulty Ambient Air Temperature Sensor 2
- Wiring harness damaged or shorted
- Connector corrosion or looseness
- External influences like debris blocking the sensor
Typical repair cost
$50 - $150
Related codes
Frequently asked questions
Can I drive with this code present?
Yes, but it's advisable to fix it soon to avoid potential engine performance issues.
Why does this code pair with other SPNs?
It often indicates issues related to temperature sensors that affect engine management and performance.
Will the code come back after clearing?
If the underlying issue isn't fixed, it will likely return.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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