Code Definition

B0846 — 5 volt reference Circuit out of range

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

About B0846

B0846 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 B0846 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 B0846 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

DTC B0846 is a generic body code that indicates the control module has detected its 5-volt reference output voltage sitting outside the expected range. The 5V reference is an internally regulated supply voltage that the module distributes to multiple analogue sensors — typical loads include throttle position, pedal position, MAP, MAF, oil pressure, fuel pressure, refrigerant pressure, and various potentiometer-feedback actuators. The module monitors the regulated rail and sets this code when the rail is dragged below specification by an external short to ground, pulled above specification by...

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