Ambient Temperature Sensor 1 Out of Range
The ambient temperature sensor is reading outside of its normal range.
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What it means (plain English)
The ambient temperature sensor measures outside air temperature to help the engine control module (ECM) optimize performance. If this sensor fails or reads too high/low, it can mess up fuel mixture and emissions settings.
What the computer is actually seeing
The ECM expects the ambient temperature to be between -40°C to 85°C (-40°F to 185°F). If the reading is below -40°C or above 85°C, a fault code is triggered.
What a healthy reading looks like
Ambient temperature readings should be between approximately 0°C to 40°C (32°F to 104°F) during typical operating conditions.
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 ambient temperature sensor wiring and connectors for damage or corrosion. If damaged, repair or replace.
- 22. Measure the voltage at the sensor at an ambient temperature of 25°C (77°F); you should see approximately 0.5V to 4.5V. If the voltage is out of range, replace the sensor.
- 33. If the voltage is normal, check the ECM for any internal issues. Flash the software if necessary and retrain the system.
Common causes
- Faulty ambient temperature sensor
- Wiring issues (shorts or broken wires)
- Corroded or loose connectors
- Extreme weather conditions affecting sensor reading
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but fuel efficiency and emissions may be affected. Fix it soon.
Will the code come back after clearing it?
If the issue isn't resolved, the code will likely return after some time.
Why does this code sometimes pair with other codes?
Other sensors may rely on ambient temperature for accurate readings, so a fault in one can trigger faults in others.
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