Conditions for Clearing the DTC
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
DTC C056E 42
A current or history DTC will clear after the PSCM has been configured with the proper tuning profile.
DTC C056E 4B
A current or history DTC will clear after the steering position/torque sensor calibration procedure has been performed.