Engine Ambient Air Temperature Sensor - High
The Engine Ambient Air Temperature Sensor is reading too high.
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What it means (plain English)
The engine's computer measures the outside air temperature using a sensor. If it sees a number that's higher than expected, usually above 100°F (38°C), it's not happy and flags a fault.
What the computer is actually seeing
The engine control module (ECM) is seeing a voltage signal from the ambient air temperature sensor that's higher than the specified range, often indicating a short to power or a sensor failure.
What a healthy reading looks like
Ambient air temperature readings should generally range from -40°F (-40°C) to 100°F (38°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 to the ambient air temperature sensor for any damage or corrosion. If found, repair or replace as necessary.
- 2Measure the voltage at the ambient air temperature sensor connector: it should be close to the actual outside temperature in volts (1V per 32°F). If it reads significantly higher, suspect short to power.
- 3Disconnect the ambient air temperature sensor and check for a short circuit using a multimeter. If a short is present, repair the wiring as needed.
- 4If the wiring and connector are good and the voltage checks out, replace the ambient air temperature sensor.
Common causes
- Short to power in the wiring harness
- Faulty ambient air temperature sensor
- Corrosion in connector or wiring
- Engine control module (ECM) software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but it's advisable to fix soon as it may affect the engine performance or fuel economy.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return.
Why does this code pair with others?
It often indicates sensor or wiring issues, which can affect multiple systems.
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