Ambient Air Temperature Sensor Circuit Out of Range
The ambient air temperature sensor is reading a temperature that is outside the normal range.
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 sensor that checks the outside air temperature is either too high, too low, or disconnected, making the engine control module confused about how to adjust fuel and air mixture.
What the computer is actually seeing
The engine control module expects the ambient air temperature to be within a range (typically -40 to 125 degrees Fahrenheit), and it's seeing a value outside of that.
What a healthy reading looks like
Normally between -40°F and 125°F (-40°C and 52°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. Check the ambient air temperature sensor connector for looseness or corrosion. If damaged, repair or replace.
- 22. Measure the resistance of the sensor at ambient temperature (should be about 2.5k ohms at 70°F). If out of spec, replace the sensor.
- 33. Inspect wiring for damage or shorts. If good, proceed to test the circuit for proper voltage (typically 5V). If voltage is not present, repair the circuit.
- 44. Clear the code and run vehicle under normal conditions to see if it returns. If it does, the issue isn't resolved; retest the sensor with a scan tool.
Common causes
- Faulty ambient air temperature sensor
- Wiring issues or short to ground
- Open circuit in sensor connection
- Environmental damage to sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Yes, but you may experience driveability issues and fuel efficiency could be affected.
Will this code come back if fixed?
If the actual cause is resolved, the code should not return. Monitor the system after repairs.
Why does this code pair with others?
Codes like SPN 55 or SPN 56 often indicate related sensor or circuit issues, so more than one error can show up together.
Working a real vehicle right now?
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