Ambient Air Temperature Sensor Voltage Out of Range
Issues detected with ambient air temperature sensor readings.
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 ambient air temperature sensor measures outside air temperature and sends this information to the engine control unit (ECU). If the sensor voltage drops below 0.5 volts or exceeds 4.5 volts, the ECU sees it as a problem and triggers this code.
What the computer is actually seeing
The ECU expects the ambient air temperature sensor to output a voltage signal between about 0.5 to 4.5 volts that corresponds to temperatures in the range of -40°F to 176°F (-40°C to 80°C). Anything outside this range indicates a fault.
What a healthy reading looks like
Expect 0.5V at -40°F, 2.5V at 68°F, and 4.5V at 176°F. If readings are outside that range, there's 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 connectors of the ambient air temperature sensor for damage or corrosion. Decision: Is everything intact? If yes, proceed to step 2. If no, repair or replace the damaged components.
- 22. Test the ambient air temperature sensor. Disconnect it and measure resistance across the terminals. Decision: Is the resistance within manufacturer specifications (typically around 2.5kΩ at 68°F)? If yes, proceed to step 3. If no, replace the sensor.
- 33. Check the voltage at the sensor connector with the key on (engine off) using a multimeter. Expect between 0.5V and 4.5V. Decision: Is the voltage within spec? If yes, check the ECU and wiring; if no, replace the sensor.
Common causes
- Faulty ambient air temperature sensor
- Wiring issues or damaged connectors
- Corroded terminals
- Short to ground or power 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 performance could be affected. Fix soon.
Will this code come back after I fix it?
If you fix the underlying issue, it shouldn't come back. Also clear the code after repairs.
Why does this code show up with SPN 6115?
SPN 6115 is related to the engine coolant temperature; both can affect engine performance and emissions.
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