Sierra, Silverado 2006-2007

5.3L V8 VIN B Std 10

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Trouble Code: U1889



Hybrid Control Module (HCM) Lost Communication With Body Control Module (BCM)

Possible Causes:

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 only these 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.
 

Trouble Code: U1890



Hybrid Control Module (HCM) Lost Communication With HVAC Control Module

Possible Causes:

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 only these 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.
 

Trouble Code: U1891



Hybrid Control Module (HCM) Lost Communication With Instrument Panel Cluster (IPC)

Possible Causes:

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 only these 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.
 

Trouble Code: U1892



Hybrid Control Module (HCM) Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module

Possible Causes:

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 only these 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.
 

Trouble Code: U1893



Hybrid Control Module (HCM) Lost Communication With Powertrain Control Module (PCM)

Possible Causes:

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 only these 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.
 

Trouble Code: U1894



Hybrid Control Module (HCM) Lost Communication With Starter/Generator Control Module (SGCM)

Possible Causes:

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 only these 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.
 

Trouble Code: U1895



Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Powertrain Control Module (PCM)

Possible Causes:

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 only these 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.
 

Trouble Code: U1896



Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Starter/Generator Control Module (SGCM)

Possible Causes:

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 only these 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.
 

Trouble Code: U1897



Starter/Generator Control Module (SGCM) Lost Communication With Energy Storage Control Module (ESCM)

Possible Causes:

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 only these 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.
 

Trouble Code: U1898



Starter/Generator Control Module (SGCM) Lost Communication With Hybrid Control Module (HCM)

Possible Causes:

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 only these 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.
 

Trouble Code: U1899



Starter/Generator Control Module (SGCM) Lost Communication With Powertrain Control Module (PCM)

Possible Causes:

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 only these 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.
 

 
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