Ambient Temperature Sensor Circuit Range/Performance Problem
The ambient temperature sensor is reading outside of expected parameters.
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What it means (plain English)
The ambient temperature sensor detects the outside temperature and sends that info to the vehicle's computer. If it gets a reading way too high or low, it's a sign there's a problem.
What the computer is actually seeing
The vehicle's computer expects the ambient temperature between -40°C (-40°F) and +85°C (185°F). If it reads below -40°C or above +85°C, it triggers the B1524 code.
What a healthy reading looks like
Ambient temperature readings should typically be within -40°C to +85°C. Check the sensor output at connector: it should be around 25°C (77°F) at room temperature.
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 wiring and connectors for damage or corrosion; ensure all connections are secure.
- 2Measure the resistance of the ambient temperature sensor: It should be about 2.5k ohms at 25°C. If out of spec, replace the sensor.
- 3Use a multimeter to check voltage at the sensor connector while the engine is running; should be around 0.5V to 4.5V depending on temperature.
- 4If the sensor is working properly but the code persists, look for shorts or opens in the wiring harness leading to the ECM.
Common causes
- Faulty ambient temperature sensor
- Wiring issues or damaged connectors
- Corrosion or moisture intrusion at connector
- Faulty Engine Control Module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the performance of HVAC systems may be affected.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will likely return.
Why do I see this code paired with HVAC issues?
The ambient temperature sensor feeds data to control HVAC functionality, affecting temperature settings.
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