Diagnostic Aids
IMPORTANT:
- For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.
- DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If the codes are set as history only, clear the codes.
- An intermittent open between a module and a star connector may cause this DTC to set.
- An intermittent open on high speed GMLAN may cause this DTC to set.
- An open voltage or ground circuit to a module may cause this DTC to set.
- An internal module malfunction may cause this DTC to set.