Envoy, Rainer, Trailblazer 2006-2007

5.3L V8 VIN M Auto 13

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Trouble Code: U2105



Lost Communication With Engine Control Module (ECM)

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U2105



Lost Communications With Engine Control System

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
If there are multiple non-communicating modules choose the one closest to the EBCM.
 

Trouble Code: U2107



Lost Communications With Body Control System

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
If there are multiple non-communicating modules choose the one closest to the EBCM.
 

Trouble Code: U2108



Lost Communications With ABS/TCS Control System

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
If there are multiple non-communicating modules choose the one closest to the EBCM.
 

Trouble Code: U2199



Unassigned

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U2199



Unassigned

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
If there are multiple non-communicating modules choose the one closest to the EBCM.
 

 
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