Ambient Air Temperature Sensor Circuit Out of Range
The ambient air temperature sensor is reading outside its normal range.
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What it means (plain English)
The ambient air temperature sensor measures the outside air temperature. If it's too high or low compared to expected values, the engine computer thinks there's a problem and triggers this code.
What the computer is actually seeing
The engine control module (ECM) monitors the voltage from the ambient air temperature sensor. Typical operating range is expected to be between 0.5V (approx. -40°C) and 4.5V (approx. 125°C).
What a healthy reading looks like
Sensor output should be 0.5V to 4.5V corresponding to -40°C to 125°C. If voltage is below 0.2V or above 4.8V, it indicates a fault.
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 wiring and connector for the ambient air temperature sensor. Look for corrosion, frays, or loose connections. If found, repair or replace as needed.
- 22. Measure the voltage at the ambient air temperature sensor connector with the engine running. It should read between 0.5V and 4.5V. If it reads below 0.2V or above 4.8V, continue diagnosing.
- 33. If the readings are out of range, disconnect the sensor and measure the resistance across its terminals. If it’s not within the manufacturer’s specs, replace the sensor.
- 44. If the sensor tests good, check the ECM inputs and grounds. Make sure voltage is steady and connections are secure.
Common causes
- Faulty ambient air temperature sensor
- Wiring issues such as shorts or opens
- Corrosion in the connector or terminals
- Faulty engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s moderately safe to drive, but it might affect engine performance and emissions. Fix it soon.
Will this code come back after I clear it?
If the underlying issue isn't fixed, it likely will return when conditions are met.
Why does this code frequently pair with SPN 2311?
SPN 2311 relates to the same sensor's performance, indicating the system is seeing additional faults.
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