Diagnostic Aids

Extreme cold Temperatures, below -18°C (0°F), can cause a DTC C0407 to set. If DTC C0407 sets under these conditions it may be caused by the fluid viscosity and not an electrical malfunction. Before performing the diagnostics allow the differential clutch fluid temperature to rise above 0°C (32°F). If the DTC is no longer set or set in history when above 0°C (32°F) the issue was caused by the fluid viscosity and does not require any electrical repairs. Check for Rear Differential Clutch Control Module calibration updates.