Ambient Temperature Sensor Open
The B0805 code means the vehicle's onboard diagnostic system has detected: Ambient Temperature Sensor Open. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $40 - $350 (parts and labor)
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Common Symptoms
- Climate control blows wrong temperature
- AC not cooling properly
- Heater not warming cabin
- Temperature fluctuates unexpectedly
Probable Causes (Ranked by Likelihood)
- Faulty temperature sensor Very High
- Damaged sensor wiring High
- Climate control module fault Moderate
- Refrigerant system issue Low
Step-by-Step Diagnostic Procedure
-
Test temperature sensor resistance with multimeter
-
Check sensor connector for corrosion
-
Compare sensor reading to actual temperature
-
Scan HVAC module for fault codes
Frequently Asked Questions
Why does my AC blow hot air on one side?
A faulty temperature sensor on that side can cause the blend door to open incorrectly, mixing hot air into the cooled air.
What does the sunload sensor do?
It measures sunlight intensity through the windshield and adjusts climate output to compensate for solar heating.
Can I drive with a faulty temperature sensor?
Yes, the vehicle is safe to drive but climate control may not maintain the set temperature accurately.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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