Code Definition

B0770 — All wheel drive lamp Circuit malfunction

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

About B0770

B0770 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 B0770 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 B0770 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 B0770 is a generic body code that indicates the body control module, instrument cluster, or transfer case control module has detected an electrical malfunction in the all-wheel drive (AWD) indicator lamp circuit. The AWD indicator is used to display the operational status of the all-wheel drive system, including normal engagement, mode changes, and fault conditions. 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 commanded state, which can be the resul...

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