Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Internal pressure sensor line fault.
Pressure signal does not correlate to estimated Pressure over time.
Brake Signal does not correlate to Pressure Signal.
Signal is erratic and changes faster than physically allowed.