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The following test will isolate the problem you are having.
Clear the codes and perform a Key On Engine
Off (KOEO) self test on the Power Steering
Control Module (PSCM) to confirm the C2792 is a hard fault.
If the code is present at all times, access the PSCM near the driver's side of the firewall. At connector C1463B (the Black (BK) 4 terminal connector) check for any voltage on the Black (BK) wire at pin 2 with the connector disconnected from the module, and also check for any voltage on pin 4 White (WH) wire also with the connector disconnected from the module. If voltage is present on either wire, repair the short to voltage between the PSCM and the power steering motor.
If the BK and WH wires have no voltage, check the resistance between the two wires to check the resistance through the wiring and the power steering motor. The resistance should be very low, no more than roughly 2 ohms. If it shows abnormally high or open circuit, check each wire from the module to the motor and if the wires are OK, suspect a bad motor on the steering gear (this is normally only serviced as part of the gear assembly).
If the motor circuits test OK, check the powers and grounds to the PSCM. In C1463B, pin 1 Light Green/Violet (LG/VT) wire should be battery voltage at all times. Pin 3 BK wire should be a good ground. In C1463A (the 16 terminal Black (BK) connector) pin 1 Light Blue/Pink (LB/PK) wire should be battery voltage key on. If all powers and grounds are present and the wires to the power steering motor are not shorted to voltage as the code would indicate, suspect a faulty PSCM.