B0158

Ambient Air Temperature Sensor Circuit

Moderate severity

The HVAC control module has detected an implausible signal from the ambient air temperature sensor used by the climate control system. Symptoms include incorrect outside temperature display and erratic automatic climate behavior.

Common causes

Ambient air temperature sensor failed
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $30-170
Wiring or connector fault
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $30-170
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does B0158 mean?

B0158 means "Ambient Air Temperature Sensor Circuit". It is a generic OBD-II code that points to a fault in the body.

What are the most common causes of B0158?

ambient air temperature sensor failed; wiring or connector fault — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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