Solar Sensor Signal Circuit Range/Performance Problem
The solar sensor is not providing a valid signal to the climate control system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The solar sensor measures sunlight to help control the climate inside the vehicle. If it fails, the system can’t adjust air conditioning properly.
What the computer is actually seeing
The climate control module expects a voltage signal from the solar sensor that ranges from 0.1V (no sunlight) to 4.5V (full sunlight). An out-of-range voltage indicates a fault.
What a healthy reading looks like
Expected voltage from the solar sensor is between 0.1V and 4.5V, with varying values depending on sunlight intensity.
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 the solar sensor wiring for any visible damage or wear before testing.
- 2Using a multimeter, measure the voltage at the solar sensor connector while outside in sunlight; expect values between 0.1V and 4.5V.
- 3If the voltage is out of range, check the sensor; if the wiring looks good, replace the solar sensor.
- 4If voltage is within range, check the climate control module for fault codes or malfunction.
Common causes
- Faulty solar sensor
- Wiring issues or damaged connectors
- Climate control module malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it’s generally safe to drive, but climate control may not function correctly.
Will this code come back?
If the underlying issue is not fixed, yes, the code will reappear.
Why do I see this code often with B1427?
B1427 is a related code indicating similar signal issues with the solar sensor.
Working a real vehicle right now?
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