Code Definition

B0780 — Four-wheel drive low range lamp Circuit malfunction

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

About B0780

B0780 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 B0780 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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 B0780 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 B0780 is a generic body code that indicates the transfer case control module (TCCM), body control module, or instrument cluster has detected an electrical malfunction in the four-wheel drive (4WD) low-range indicator lamp circuit. This indicator confirms to the driver that the transfer case has shifted into 4-Low and is locked in that gear-reduced operating mode for off-road, towing, or steep-grade use. The driving module commands the lamp on or off using a low-side or high-side driver and monitors the resulting circuit voltage; the code sets when the monitored voltage does not match the c...

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