Equinox 2005-2007, Torrent 2006-07

3.4L V6 VIN F Auto 12

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Trouble Code: U1500



Inter-Device Dedicated Bus 1

Possible Causes:



An open on 1 CAN Bus circuit will not cause a U1500 DTC.
 
If there are multiple non-communicating modules choose the one farthest from the EBCM.
 

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.
 
Short to ground may also open the fuse feeding the ignition switch.
 

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
 

Trouble Code: U2100



High Speed CAN Communication Bus

Possible Causes:



The BCM can set this DTC as current because it is the gateway between the class 2 and high speed GMLAN serial data circuits, and the BCM diagnostics is performed on class 2 data link. Refer to Data Link Communications Description and Operation for more information about data link communication. The high speed GMLAN serial data bus uses two 120 ohms terminating resistors that are in parallel with the high speed GMLAN (+) and (-) circuits. One of the resistors is connected at the BCM and the other is at the engine control module (ECM). When testing for a short between high speed GMLAN (+) and (-) a reading of 60 ohms is normal. If the high speed GMLAN serial data is open testing the resistance between high speed GMLAN (+) and (-) will read about 120 ohms.
 

Trouble Code: U2100



Controller Area Network (CAN) Bus Communication

Possible Causes:



This DTC cannot be retrieved with a current status. Diagnosis of a current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with High Speed GMLAN Device , or Scan Tool Does Not Communicate with Low Speed GMLAN Device depending on the module serial data communication.
 
An intermittent condition is likely to be caused by a short on the GMLAN serial data circuits. Use the Scan Tool Does Not Communicate with High Speed GMLAN Device , or Scan Tool Does Not Communicate with Low Speed GMLAN Device procedure in order to isolate an intermittent condition.
 

Trouble Code: U2104



Controller Area Network (CAN) Bus Reset Counter Overrun

Possible Causes:



This DTC cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with high speed GMLAN Device. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
 
An intermittent condition is likely to be caused by a short on the high speed high speed GMLAN serial data circuits. Use the Scan Tool Does Not Communicate with high speed GMLAN Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
 

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 Communication 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 data link connector (DLC).
 
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.
 

Trouble Code: U2105



Loss Communication with UART 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: U2106



Lost Communication With Transmission Control Module (TCM)

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: U2106



Lost Communications With Transmission 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 data link connector (DLC).
 
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.
 

Trouble Code: U2107



Lost Communication With Body Control Module (BCM)

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: 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 data link connector (DLC).
 
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.
 

Trouble Code: U2108



Lost Communication With Electronic Brake Control Module (EBCM)

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: U2142



Loss Communication with UART 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 data link connector (DLC).
 
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.
 

Trouble Code: U2142



Lost Communication With Yaw Rate Sensor (YRS)

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: U2143



Lost Communications With Steering Angle Sensor (SAS)

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).
 
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.
 

Trouble Code: U2143



Lost Communications With Steering Angle Sensor (SAS)

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 data link connector (DLC).
 
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.
 

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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