Ambient Temperature Sensor Circuit Range/Performance Problem
There’s a fault with the ambient temperature sensor reading.
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 temperature sensor, which gauges outside temperature, is giving readings that don’t make sense, affecting systems that rely on this data.
What the computer is actually seeing
The vehicle's computer expects the ambient temperature sensor to read temperatures between -40°F and 158°F (-40°C and 70°C). If it reads outside this range or fluctuates wildly, it triggers this code.
What a healthy reading looks like
Expected sensor voltage should range between 0.5V (at -40°F) to 4.5V (at 158°F).
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 connector for any visible damage or corrosion. Is the connector secure and clean?
- 22. Measure voltage at the ambient temperature sensor. Is it between 0.5V to 4.5V when at normal room temperature (around 70°F)?
- 33. Check for continuity in the wiring harness from the ambient temperature sensor to the engine control module (ECM). Is there continuity?
- 44. If wiring is good, replace the ambient temperature sensor. Does the fault code clear?
- 55. If code returns, check for possible ECM issues or software updates.
Common causes
- Faulty ambient temperature sensor
- Wiring issues or broken connectors
- Corrosion at the connector
- Incorrect mounting position of the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the performance of systems dependent on outside temperature might be impacted.
Will the code come back after I reset it?
It might if the underlying issue isn’t resolved, so ensure all checks are performed.
Why does it matter if this sensor is faulty?
Incorrect temperature readings can affect fuel management, HVAC functions, and overall vehicle efficiency.
Working a real vehicle right now?
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