B0156

Sun Load Sensor Circuit

Moderate severity

The HVAC control module has detected an implausible signal from the sun load (solar) sensor, typically located on the dashboard. Automatic climate control uses this signal to bias cooling on the side facing the sun.

Common causes

Sun load sensor failed
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $30-220
Wiring or connector fault
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $30-220
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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 B0156 mean?

B0156 means "Sun Load Sensor Circuit". It is a generic OBD-II code that points to a fault in the body.

What are the most common causes of B0156?

sun load 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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