Code Definition

B0183 — Sun load sensor signal error - sensor 1

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

About B0183

B0183 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 B0183 is stored, the module has detected 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 B0183 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 Sun Load Sensor (also called the solar or sunlight sensor) is a photodiode mounted in the top of the dashboard, usually under a small clear lens near the windscreen, that measures the intensity of sunlight entering the cabin. The HVAC control module uses this input to bias blower speed, blend door position and outlet temperature so the climate system compensates for radiant heat gain on sunny days. DTC B0183 is set when the HVAC control module sees an invalid, erratic or out-of-range voltage on the sun load sensor 1 circuit, indicating the sensor itself, the wiring, or the reference supply...

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