Code Definition

C0306 — TCCM Motor A or B Circuit Voltage Too High or Too Low

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

About C0306

C0306 is a generic (obd-ii standard) chassis diagnostic trouble code recorded for Infiniti vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C0306 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a signal or supply voltage higher than the expected operating range.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

Because C0306 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 Transfer Case Control Module (TCCM) monitors the voltage levels and feedback of the Motor A and Motor B circuits used to drive the transfer case shift or clutch mechanism. DTC C0306 is set when the TCCM detects that the motor control circuit voltage is outside the specified operating range, either excessively high or low, for a calibrated period during commanded motor operation. This indicates an electrical fault that prevents accurate transfer case actuation or position control. With this code set the system is typically unable to change range, a service four wheel drive message is displa...

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