CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

4.6L V8 VIN 9 Auto 8

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Trouble Code: U0214



Lost Communication With Remote Function Actuation (RFA)

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 data link connector (DLC).
 
Use Data Link References to determine if the module uses high or low speed GMLAN serial data communications
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with high or low speed GMLAN serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U0214



Lost Communication With Remote Function Actuator (RFA)

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 data link connector (DLC).
 
Use Data Link References to determine if the module uses high or low speed GMLAN serial data communications
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with high or low speed GMLAN serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U0241



Lost Communication With Headlamp Control Module A

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 data link connector (DLC).
 
Use Data Link References to determine if the module uses high or low speed GMLAN serial data communications
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with high or low speed GMLAN serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U0299



N/A

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 data link connector (DLC).
 
Use Data Link References to determine if the module uses high or low speed GMLAN serial data communications
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with high or low speed GMLAN serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1500



Inter-Device Dedicated Bus 1 Short to Battery

Possible Causes:



Both DTC U1511 and U1512 will set if an open/high resistance in the local interconnect network bus circuit is between the door module and the first splice.
 
Only 1 DTC (U1511 or U1512) will set if an open/high resistance in the local interconnect network bus circuit is between the splice and the window motor.
 

Trouble Code: U1511



Inter-device Dedicated Bus Lost Communication With Device 1

Possible Causes:



Both DTC U1511 and U1512 will set if an open/high resistance in the local interconnect network bus circuit is between the door module and the first splice.
 
Only 1 DTC (U1511 or U1512) will set if an open/high resistance in the local interconnect network bus circuit is between the splice and the window motor.
 

Trouble Code: U1512



Inter-device Dedicated Bus Lost Communication With Device 2

Possible Causes:



Both DTC U1511 and U1512 will set if an open/high resistance in the local interconnect network bus circuit is between the door module and the first splice.
 
Only 1 DTC (U1511 or U1512) will set if an open/high resistance in the local interconnect network bus circuit is between the splice and the window motor.
 

Trouble Code: U1513



Inter-device Dedicated Bus

Possible Causes:



Both DTC U1511 and U1512 will set if an open/high resistance in the local interconnect network bus circuit is between the door module and the first splice.
 
Only 1 DTC (U1511 or U1512) will set if an open/high resistance in the local interconnect network bus circuit is between the splice and the window motor.
 

Trouble Code: U1814



Powertrain High Speed Communication Enable Circuit

Possible Causes:



Use the DMM MIN/MAX function to capture/locate intermittent conditions.
 
Short to ground may also set multiple no communication codes for GMLAN high speed modules.
 

Trouble Code: U2099



High Speed Communication Enable Circuit

Possible Causes:



Use the DMM MIN/MAX function to capture/locate intermittent conditions.
 
Short to ground will also set multiple history no communication codes for GMLAN high speed modules
 

 
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