C0327

C0327 means the ABS or TCCM (transfer case control module) sees a fault in the encoder motor circuit on a 4WD transfer case shift motor — the electric motor that physically rotates the transfer-case shift fork between 2HI, 4HI, N, and 4LO has either failed open, failed shorted, or its position-feedback encoder is sending bad data. Diagnostic order: (1) Inspect the shift motor on the back of the transfer case — most are bolted on with 4 bolts and a single connector, sitting behind the t-case and exposed to road spray. Pull the connector and check for water intrusion or green corrosion on the pins; salt-belt vehicles eat these connectors. (2) Back-probe the motor connector with key-on and command a shift through the dash button or scan tool — the motor should draw 5-20A momentarily as it rotates; no current draw means open motor or open wiring, sustained high current means stuck mechanism. (3) Ohm the encoder position-feedback wires per FSM spec — most encoders are 4-position contacts that read different voltage divider values for each shift position. (4) Visually inspect the t-case shift fork through the motor bore — a snapped fork or worn shift collar will let the motor spin freely without engaging. Misdiagnosis caveat: replacing the encoder motor without diagnosing why the original failed leads to repeat failure within 30k miles — if the t-case has internal binding (worn pump, bad bearing, low fluid), the motor stalls under load and burns out; do a fluid check and rotate the input shaft by hand before installing a new motor.

Vehicle-specific patterns: 2002-2010 Ford Explorer/Mountaineer/Expedition with the BorgWarner 44-04/44-06 transfer case is the classic C0327 case in North America — the encoder motor gets road-spray water intrusion through the wiring boot and locks up around 100k miles; Ford has published TSBs covering inspection and replacement procedures (verify current TSB list through OASIS or Motorcraft service portal before quoting). 1999-2007 GM trucks (Silverado, Sierra, Tahoe, Yukon) with the NP246 or NP149 Autotrac transfer case throw C0327 from encoder motor failure or TCCM internal short — the TCCM is mounted on the t-case and shares the same water-intrusion fate. 2005-2014 Toyota Tundra/Sequoia 4WD with the Active Torque Control (ATC) actuator throws C0327 when the actuator motor binds; Toyota issued service campaigns on certain VIN ranges. 2008-2014 Jeep Liberty/Commander throws C0327 from NV245 transfer case shift motor failure. Estimated repair: $250 (DIY encoder motor) to $1,500 (complete shift motor and TCCM with programming).