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    Equinox 2005-2007, Torrent 2006-07

    3.4L V6 VIN F Auto 11

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    Trouble Code: U0172



    Lost Communication With Rollover Sensor

    Trouble Code: U0184



    Lost Communication With Radio

    Trouble Code: U0186



    Lost Communication With Audio Amplifier

    Trouble Code: U0194



    Lost Communication With Digital Radio Receiver (DRR)

    Trouble Code: U0198



    Lost Communication With Telematic Control Module

    Trouble Code: U0199



    Lost Communication With Door Control Module A (DDM)

    Trouble Code: U0200



    Lost Communication With Door Control Module B (PDM)

    Trouble Code: U0208



    Lost Communication With Seat Control Module A (DSM/MSM)

    Trouble Code: U0209



    Lost Communication With Seat Control Module B (HVSM)

    Trouble Code: U0210



    Lost Communication With Seat Control Module C (RHVSM)

    Trouble Code: U0214



    Lost Communication With Remote Function Actuation

    Trouble Code: U0230



    Lost Communication With Rear Gate Module

    Trouble Code: U0232



    Lost Communications With Side Object Detection (SOD) Module - Left

    Trouble Code: U0233



    Lost Communications With Side Object Detection (SOD) Module - Right

    Trouble Code: U0236



    Lost Communications With Column Locking Module (CLM)

    Trouble Code: U0241



    Lost Communication With Headlamp Control Module A

    Trouble Code: U0249



    Lost Communication With Entertainment Control Module - Rear B

    Trouble Code: U0291



    Lost Communication With Television

    Trouble Code: U0299



    N/A

    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: U0299



    N/A

    Trouble Code: U1000



    Class 2 Communication Malfunction

    Possible Causes:



    Class 2 circuit is open, shorted to ground or shorted to power
     
    PCM ignition power circuit(s) has a high resistance condition
     
    PCM main ground circuit(s) has a high resistance condition
     
    SDM (module) could be shorted pulling the voltage low
     

    Trouble Code: U1000



    Class 2 Data Link

    Possible Causes:



    When a malfunction such as an open fuse to a module occurs while modules are communicating, a DTC U1001-1254 Loss of XXX Communications is set current. When the modules stop communicating the current DTC U1001-1254 Loss of XXX Communications is cleared but the history DTC remains. When the modules begin to communicate again, the module with the open fuse will not be learned by the other modules so U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 or U1255 is set.
     

    Trouble Code: U1001



    Class 2 Communication Malfunction

    Possible Causes:



    An intermittent open between the inoperative module and a star connector may cause these codes.
     
    A poor connection at the inoperative module or a star connector may cause these codes.
     
    An intermittent open in a star connector may cause these codes.
     
    An improperly powered module may cause these codes.
     
    An improperly communication on the high speed GMLAN serial data circuit may cause these codes.
     

    Trouble Code: U1016



    No Communication With Powertrain Control Module

    Possible Causes:



    PCM Class 2 circuit is open, shorted to ground or to B+
     
    PCM ignition power circuit(s) has a high resistance condition
     
    PCM main ground circuit(s) has a high resistance condition
     
    PCM (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1048



    No Communication With Rear Wheel Steering Control Module

    Possible Causes:



    RWSCM Class 2 circuit is open, shorted to ground or to B+
     
    RWSCM ignition power circuit has a high resistance condition
     
    RESCM main ground circuit(s) has a high resistance condition
     
    RESCM (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1064



    No Communication With Body Control Module

    Possible Causes:



    BCM Class 2 circuit is open, shorted to ground or to B+
     
    BCM ignition power circuit has a high resistance condition
     
    BCM main ground circuit(s) has a high resistance condition
     
    BCM (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1088



    No Communication With SDM (Restraint Module)

    Possible Causes:



    SDM Class 2 circuit is open, shorted to ground or to B+
     
    SDM ignition power circuit has a high resistance condition
     
    SDM main ground circuit(s) has a high resistance condition
     
    SDM (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1096



    No Communication With Instrument Panel Cluster

    Possible Causes:



    IPC Class 2 circuit is open, shorted to ground or to B+
     
    IPC ignition power circuit has a high resistance condition
     
    IPC main ground circuit(s) has a high resistance condition
     
    IPC (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1097



    No Communication With Driver Information Center

    Possible Causes:



    DIC Class 2 circuit is open, shorted to ground or to B+
     
    DIC ignition power circuit has a high resistance condition
     
    DIC main ground circuit(s) has a high resistance condition
     
    DIC (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1151



    No Communication With Vehicle Interface Unit

    Possible Causes:



    VIU Class 2 circuit is open, shorted to ground or to B+
     
    VIU ignition power circuit has a high resistance condition
     
    VIU main ground circuit(s) has a high resistance condition
     
    VIU (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1152



    No Communication With HVAC Control Module

    Possible Causes:



    HVAC Class 2 circuit is open, shorted to ground or to B+
     
    HVAC ignition power circuit has a high resistance condition
     
    HVAC main ground circuit(s) has a high resistance condition
     
    HVAC (module) may have failed and is pulling the circuit low
     

    Trouble Code: U1254



    Lost Communication with XXX

    Possible Causes:



    An intermittent open between the inoperative module and a star connector may cause these codes.
     
    A poor connection at the inoperative module or a star connector may cause these codes.
     
    An intermittent open in a star connector may cause these codes.
     
    An improperly powered module may cause these codes.
     
    An improperly communication on the high speed GMLAN serial data circuit may cause these codes.
     

    Trouble Code: U1255



    Class 2 Communications Malfunction

    Possible Causes:



    Class 2 circuit is open, shorted to ground or shorted to power
     
    PCM ignition power circuit(s) has a high resistance condition
     
    PCM main ground circuit(s) has a high resistance condition
     

    Trouble Code: U1255



    Serial Data Line Malfunction

    Possible Causes:



    When a malfunction such as an open fuse to a module occurs while modules are communicating, a DTC U1001-1254 Loss of XXX Communications is set current. When the modules stop communicating the current DTC U1001-1254 Loss of XXX Communications is cleared but the history DTC remains. When the modules begin to communicate again, the module with the open fuse will not be learned by the other modules so U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 or U1255 is set.
     

    Trouble Code: U1300



    Class 2 Data Link Low

    Possible Causes:



    These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .
     
    An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .
     

    Trouble Code: U1301



    Class 2 Data Link High

    Possible Causes:



    These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .
     
    An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .
     

    Trouble Code: U1305



    Class 2 Data Link High or Low

    Possible Causes:



    Class 2 serial data line has either a high or low voltage condition on the circuit, and the module cannot identify the fault
     
    One or more modules on Class 2 line has an short to power
     
    One or more modules on the Class 2 line has a short to ground
     

    Trouble Code: U1305



    Class 2 Circuit Malfunction

    Possible Causes:



    These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .
     
    An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .
     

    Trouble Code: U1500



    Inter-device Dedicated Bus

    Possible Causes:



    The diagnostic procedure used for DTC U1500 in OnStar® systems with single module generations of OnStar® differ greatly from previous generations with two modules. While these older generations denoted a failure of the three wire bus between the modules by setting a U1500, single module OnStar® systems use this DTC to denote an internal module failure. The determination of whether a one or two module generation of OnStar® is used should be confirmed. Refer to OnStar Description and Operation .
     
    This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the VCIM.
     
    If this DTC is retrieved as both a current and history DTC, replace the VCIM.
     

    Trouble Code: U1500



    Inter-Device Dedicated Bus Malfunction

    Possible Causes:



    The diagnostic procedure used for DTC U1500 in OnStar® systems with single module generations of OnStar® differ greatly from previous generations with 2 modules. While these older generations denoted a failure of the 3-wire bus between the modules by setting a U1500, single module OnStar® systems use this DTC to denote an internal module failure. The determination of whether a one or 2-module generation of OnStar® is used should be confirmed. Refer to OnStar Description and Operation .
     
    This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the VCIM.
     
    If this DTC is retrieved as both a current and history DTC, replace the VCIM.
     

     
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