HVAC Ambient Temperature Sensor Circuit Malfunction
What does B1316 mean?
The B1316 code means the vehicle's onboard diagnostic system has detected: HVAC Ambient Temperature Sensor Circuit Malfunction. This is a low severity code.
Common Symptoms
- Outside temperature reading incorrect on dash
- Temperature display shows extreme values
- Automatic climate control not adjusting properly
- Temperature display reads dashes or error
- AC system compressor cycling abnormally
Probable Causes (Ranked by Likelihood)
- Failed ambient temperature sensor Very High
- Damaged sensor from road debris High
- Corroded sensor connector Moderate
- Open or shorted sensor wiring Low
Step-by-Step Diagnostic Procedure
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Compare dash temperature reading to actual outside temp
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Locate and inspect ambient sensor behind front bumper or grille
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Measure sensor resistance and compare to specs
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Check connector for corrosion or water damage
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Test wiring continuity from sensor to BCM or HVAC module
Frequently Asked Questions
Where is the ambient temperature sensor located?
It is usually mounted behind the front bumper or grille, in front of the radiator. This position allows it to read outside air temperature without being affected by engine heat.
Why does my temperature display show a wrong reading?
The sensor can give incorrect readings if it is damaged, has a corroded connector, or is located too close to a heat source. Road splash and debris damage are common causes.
Does the ambient sensor affect the AC system?
Yes. The automatic climate control uses the ambient sensor to determine how much heating or cooling is needed. An incorrect reading can cause the system to over-cool or under-heat the cabin.