Code Definition

B0790 — Transfer case neutral lamp Circuit malfunction

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

About B0790

B0790 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 B0790 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 B0790 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 B0790 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 transfer case neutral indicator lamp circuit. The neutral indicator confirms to the driver that the transfer case is in its neutral position, which disconnects driveline torque from both axles and is required for flat (dinghy) towing on many platforms. 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 ...

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