Code Definition

B2427 — Passenger Solar Radiation Sensor Circuit Short to Ground

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2427

B2427 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2427 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B2427 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Climate Control Module uses input from the passenger side solar radiation sensor, typically a photodiode mounted on the top of the dashboard near the windscreen base, to bias HVAC blower speed, mix door position, and air distribution to compensate for direct sunlight heating the cabin. DTC B2427 is set when the module detects that the solar sensor signal wire is being pulled to ground, holding the input at or near 0V regardless of actual light intensity, which the module interprets as a short to ground circuit fault. This usually means the signal wire is contacting chassis or another groun...

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