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Data Communication System: Other Chevrolet Tahoe III

Communication Devices 3 illustrations ~5153 words

Control Module U Code List

This list includes all Data Communications related U-code DTCs in alphanumeric order with descriptors for all modules. Not all DTCs listed will be applicable to all vehicles.

DTCDTC Descriptor
U0001 00High Speed CAN Bus Malfunction
U0002 00High Speed CAN Bus
U0010 00Medium Speed CAN Bus
U0020 00Low Speed CAN Bus
U0073 00Control Module Communication Bus A Off
U0073 71ECU HS Bus Off
U0073 72ECU LS Bus Off
U0074 00Control Module Communication Bus B Off
U0075 00Control Module Communication Bus C Off
U0100 00Lost Communication with Engine/Powertrain Control Module (ECM/PCM)
U0100 75Lost Communication with Engine/Powertrain Control Module (ECM)
U0100 7FLost Communication with Engine/Powertrain Control Module (ECM)
U0101 00Lost Communication with Transmission Control Module (TCM)
U0101 75Lost Communication with Transmission Control Module (TCM)
U0102 00Lost Communication with Transfer Case Control Module
U0104 00Lost Communication with Cruise Control Module
U0104 7FLost Communication with Cruise Control Module
U0106 00Lost Communication with Glow Plug Control Module
U0109 00Lost Communication with Fuel Pump Control Module
U010E 00Lost Communication with Reductant Sensor Module
U010F 00Lost Communication with Air Conditioning Control Module
U0111 00Lost Communication with Battery Energy Control Module
U0115 00Lost Communication with ECM/PCM B
U0117 00Lost Communication PTO Control Module
U0121 00Lost Communication with Electronic Brake Control Module (EBCM)
U0122 00Lost Communication with Vehicle Stability Control Module (ESCM)
U0123 00Lost Communication with Yaw Rate Sensor Module
U0126 00Lost Communication with Steering Wheel Angle Sensor Module
U0128 00Lost Communication with Park Brake Control Module
U0129 00Lost Communication with Brake System Control Module
U0131 00Lost Communication with Power Steering Control Module
U0132 00Lost Communication with Suspension Control Module
U0134 00Lost Communication with Power Steering Control Module - Rear
U0136 00Lost Communication with Differential Control Module - Rear
U0137 00Lost Communication with Trailer Brake Control Module
U0140 00Lost Communication with Body Control Module
U0141 00Lost Communication with Body Control Module A
U0144 00Lost Communication with Body Control Module D
U0146 00Lost Communication with Gateway A
U0151 00Lost Communication with Inflatable Restraint Sensing and Diagnostic Module (SDM)
U0151 71Lost Communication with Inflatable Restraint Sensing and Diagnostic Module (SDM) Invalid Serial Data Received
U0151 7FLost Communication with Restraints Control Inflatable Restraint Sensing and Diagnostic Module (SDM) Erratic
U0155 00Lost Communication with Instrument Panel Cluster (IPC) Control Module
U0156 00Lost Communication with Information Center A (DIC)
U0157 00Lost Communication with Information Center B (DID)
U0158 00Lost Communication with Head Up Display
U0159 00Lost Communication with Parking Assist Control Module (RPA)
U0160 00Lost Communication with Chime Alarm Control Module
U0164 00Lost Communication with HVAC Control Module
U0165 00Loss of Communication with HVAC Control Module - Rear
U0166 00Lost Communication with Auxiliary Heater Control Module
U0168 00Lost Communication with Vehicle Security Control Module
U0170 00Lost Communication with Restraints System Sensor A (PPS)
U0172 00Lost Communication with Restraints System Sensor C
U0173 00Lost Communication with Restraints System Sensor D
U0181 00Lost Communication with Headlamp Leveling Control Module
U0184 00Lost Communication with Radio
U0186 00Lost Communication with Audio Amplifier
U0191 00Lost Communication with Television
U0194 00Lost Communication with Digital Radio Receiver (DRR)
U0196 00Lost Communication with Rear Audio Control Module
U0198 00Lost Communication with Telematic Control Module
U0199 00Lost Communication with Driver Door Control Module
U0200 00Lost Communication with Door Control Module
U0208 00Lost Communication with Seat Control Module A (DSM/MSM)
U0209 00Lost Communication with Seat Control Module B (HVSM)
U0210 00Lost Communication with Seat Control Module C (RHSM)
U0214 00Lost Communication with Remote Function Actuation
U0230 00Lost Communication with Rear Gate Module
U0232 00Lost Communication with Side Object Detection (SOD) Module - Left
U0233 00Lost Communication with Side Object Detection (SOD) Module - Right
U0236 00Lost Communication with Column Locking Module (CLM)
U023A 00Lost Communication with Vehicle Direction Camera Control Module (Lane Departure Warning)
U0241 00Lost Communication with Headlamp Control Module A
U0249 00Loss of Communication with Entertainment Control Module - Rear B
U0252 00Lost Communication with Trailer Interface Module
U0255 00Loss of Communication with Front Display Interface Module
U0256 00Loss of Communication with Front Controls Interface Module
U0257 00Loss of Communication with Front Controls/Display Interface Module
U0293 00Lost Communication with HP2 Powertrain Control Module
U029D 00Lost Communication with NOX Sensor Module 1
U029E 00Lost Communication with NOX Sensor Module 2
U0401 00Invalid Data Received From ECM
U0401 72Invalid Data Received From ECM Message Counter Incorrect
U0401 74Invalid Data Received From ECM Bus Signal Checksum Error
U0402 72Invalid Data Received From Transmission Control Module Message Counter Incorrect
U0402 73Invalid Data Received From Transmission Control Module Parity Error
U0402 74Invalid Data Received From Transmission Control Module Bus Signal Checksum Error
U0405 00Invalid Data Received From Cruise Module
U0405 71Invalid Data Received From Cruise Control Module Invalid Data
U0405 72Invalid Data Received From Cruise Control Module Message Counter Incorrect
U0405 74Invalid Data Received From Cruise Control Module Bus Signal Checksum Error
U0415 00Invalid Data Received From Electronic Brake Control Module
U0415 72Invalid Data Received From Electronic Brake Control Module Message Counter Incorrect
U0415 74Invalid Data Received From Electronic Brake Control Module Bus Signal Checksum Error
U0416 00Invalid Data Received From Vehicle Dynamics Control Module
U0416 72Invalid Data Received From Vehicle Dynamics Control Module Message Counter Incorrect
U0416 74Invalid Data Received From Vehicle Dynamics Control Module Bus Signal Checksum Error
U0418 00Invalid Data Received From Brake System Control Module
U0418 71Invalid Data Received From Brake System Control Module Invalid Data
U0418 72Invalid Data Received From Brake System Control Module Message Counter Incorrect
U0422 00Invalid Data Received From Body Control Module
U0422 70Invalid Data Received From Body Control Module
U0422 72Invalid Data Received From Body Control Module Message Counter Incorrect
U0422 74Invalid Data Received From Body Control Module Bus Signal Checksum Error
U0424 00Invalid Data Received From HVAC Control Module
U0432 00Invalid Data Received From Multi-Axis Acceleration Sensor Module
U0432 72Invalid Data Received From Multi-Axis Acceleration Sensor Module Message Counter Incorrect
U0432 74Invalid Data Received From Multi-Axis Acceleration Sensor Module Bus Signal Checksum Error
U0438 71Invalid Data Received From Trailer Brake Control Module
U0465 00Invalid Data Received From Power Take-Off Control Module
U180FElectronic Brake Control Module Communications Bus B OFF
U1000Class 2 Data Link Malfunction
U1016Lost Communication with ECM/PCM
U1017Lost Communication with Engine Control System
U1024Lost Communication with Transmission Control Module
U1026Lost Communication with Transfer Case Control Module
U1040Lost Communication with Electronic Brake Control Module
U1041Lost Communication with Electronic Brake Control Module
U1064Lost Communication with Body Control Module/Dash Integration Module
U1088Lost Communication with Inflatable Restraint Sensing and Diagnostic Module
U1096Lost Communication with Instrument Panel Cluster
U1098Lost Communication with Secondary Information Center
U1099Lost Communication with Head Up Display
U1100Lost Communication with Driver Information and Displays Control System
U1128Lost Communication with Radio
U1129Lost Communication with Amplifier
U1133Lost Communication with Mini Disc Changer
U1137Lost Communication with Satellite Digital Audio Reception System (DRR)
U1153Lost Communication with Climate Control Panel
U1162Lost Communication with Liftgate Module
U1164Lost Communication with Driver Door Switch
U1165Lost Communication with Passenger Door Switch
U1176Lost Communication with Remote Function Actuation
U1177Lost Communication with Folding Top Controller
U1192Lost Communication with Immobilizer
U1193Lost Communication with Remote Control Door Lock Receiver
U1255Loss of Class 2 Communication
U1300Class 2 Data Link Low
U1301Class 2 Data Link High
U1305Class 2 Data Link High or Low
U1500 00Inter Device Dedicated Bus
U1500 00(EBCM) Inter Device Dedicated Bus (Lost Communication with Yaw and Lateral Accelerometer Sensor)
U1500 00(DDM/PDM) Inter Device Dedicated Bus (Lost Communication with Front Window Motor)
U1500 01Inter-Device Dedicated Bus Short to Battery
U1500 02Inter-Device Dedicated Bus Short to Ground
U1511 00(BCM) Inter-device Dedicated Bus 1 Lost Communication with Device 1 (Electronic Compass Module)
U1511 00(DDM/PDM) Inter-device Dedicated Bus 1 Lost Communication with Device 1 (Front Window Motor)
U1511 00(HCM) Inter-device Dedicated Bus 1 Lost Communication with Device 1 (AFL - Left)
U1512 00(DDM) Inter-device Dedicated Bus 1 Lost Communication with Device 2 (Left Rear Window Motor)
U1513 00(PDM) Inter-device Dedicated Bus 1 Lost Communication with Device 3 (Right Rear Window Motor)
U1521 00(HCM) Inter-device Dedicated Bus 2 Lost Communication with Device 1 (AFL - Right)
U1650 00Chassis System Dedicated Bus Controller
U1651 00Chassis System Dedicated Bus Sensor
U180F 00Control Module Communication Bus B Off
U1802 00Lost Communication with Fuel Pump Control Module
U1812 00Battery Energy Control Module Bus B High Speed Communication Enable Circuit Low
U1813 00Battery Energy Control Module Bus B High Speed Communication Enable Circuit High
U1814 00Powertrain High Speed Communication Enable Circuit
U1815 00Lost Communication with Drive Motor Control Module A on Bus B
U1816 00Lost Communication with Drive Motor Control Module B on Bus B
U1817 00Lost Communication with Hybrid Powertrain Control Module on Bus B
U1818 00Lost Communication with ECM/PCM A on Bus B
U1820 00Lost Communication with Brake System Control Module on Bus B
U1821 00Lost Communication with DC to DC Converter Control Module A on Bus B
U1822 00Lost Communications with Power Steering Control Module on Bus B
U1823 00Lost Communications with Cruise Control Module on Bus B
U1824 00Lost Communications with Suspension Control Module
U1825 00Lost Communications with Vehicle Dynamics Control Module
U1826 71Lost Communication with Multi-Axis Acceleration Sensor Module on Bus B Invalid Serial Data Received
U1826 72Lost Communication with Multi-Axis Acceleration Sensor Module on Bus B Alive Counter Incorrect/Not Updated
U1826 7FLost Communication with Multi-Axis Acceleration Sensor Module on Bus B Erratic
U1827 71Lost Communication with Steering Angle Sensor Module on Bus B Invalid Serial Data
U1827 72Lost Communication with Steering Angle Sensor Module on Bus B Alive Counter Incorrect/Not Updated
U1827 74Lost Communication with Steering Angle Sensor Module on Bus B Value of Signal Protection Calculation Incorrect
U1827 7FLost Communication with Steering Angle Sensor Module on Bus B Erratic
U1829 00Lost Communication with Gateway A on Bus B
U182A 00Lost Communication with Battery Energy Control Module on Bus B
U1842 00Electronic Brake Control Module Lost Communication with Engine Control Module on Bus B
U1843 00Electronic Brake Control Module Lost Communication with Hybrid Engine Control Module on Bus B
U1862 00Battery Energy Control Module Lost Communication with Communications Gateway Module
U1863 00Starter/Generator Control Module Lost Communication with Body Control Module
U1865 00Fuel Operated Heater Lost Communication with Engine Control Module
U1866 00Battery Energy Control Module Lost Communication with Body Control Module
U186A 00Lost Communication with Transfer Case Control Module
U186B 00Lost Communication with TCM
U1875 00Drive Motor A Control Module Lost Communication with Battery Energy Control Module
U1876 00Drive Motor A Control Module Lost Communication with Engine Control Module (ECM)/Powertrain Control Module (PCM)
U1878 00Drive Motor B Control Module Lost Communication with Battery Energy Control Module
U1879 00Drive Motor B Control Module Lost Communication with Engine Control Module (ECM)/Powertrain Control Module (PCM)
U1885 00Battery Energy Control Module Lost Communication with HP2 Powertrain Control Module
U1886 00Battery Energy Control Module Lost Communication with Engine Control Module (ECM)
U1888 00Hybrid Powertrain Control Module Lost Communication With Starter/Generator Control Module
U1897 00Starter/Generator Control Module Lost Communication with Battery Energy Control Module
U1899 00Starter/Generator Control Module Lost Communication with Engine Control Module/Powertrain Control Module
U189A 00DC to DC Converter Control Module A Lost Communication with HP2 Powertrain Control Module
U2099 00High Speed Communication Enable Circuit
U209A 00High Speed Communication Enable Circuit Low
U209D 00Battery Energy Control Module High Speed Communication Enable Circuit High
U2100 00Controller Area Network (CAN) Bus Communication
U2100 47Controller Area Network (CAN) Bus Communication
U2102 00More Controllers On Bus Than Programmed
U2103 00Fewer Controllers On Bus Than Programmed
U2105 00Lost Communication with Engine Control Module
U2106 00Lost Communication with Transmission Control Module
U2107 00Lost Communication with Body Control Module
U2108 00Lost Communication with ABS/TCS Control System
U2109 00Lost Communication with Powertrain Control Module
U2110 00Lost Communication with Chassis Multiple Control System
U2111 00Lost Communication with Steering Control Module
U2112 00Lost Communication with Electronic Suspension Control (ESC)
U2113 00Lost Communication with Sensing and Diagnostic Module (SDM)
U2114 00Lost Communication with PPS or CPS
U2115 00Lost Communication with Restraints Control System
U2116 00Lost Communication with Instrument Cluster
U2117 00Lost Communication with Info Display
U2118 00Lost Communication with Head Up Display (HUD)
U2119 00Lost Communication with Daytime Running Lamps Control Module
U2120 00Lost Communication with Automatic Headlamp Leveling Control Module
U2121 00Lost Communication with Radio Display
U2122 00Lost Communication with Radio
U2123 00Lost Communication with Compact Disc Changer (CDX)
U2124 00Lost Communication with Audio Amplifier
U2125 00Lost Communication with Telematic Unit
U2126 00Lost Communication with Mobile Communications Control System
U2127 00Lost Communication with Front HVAC Control Module
U2128 00Lost Communication with Rear HVAC Control Module
U2129 00Lost Communication with Remote Function Actuator (RFA)
U2130 00Lost Communication with Driver Door Module (DDM)
U2131 00Lost Communication with Driver Seat Module (DSM)
U2132 00Lost Communication with Passenger Door Module (PDM)
U2133 00Lost Communication with Passenger Seat Module (PSM)
U2134 00Lost Communication with Rear Door Module (RDM)
U2135 00Lost Communication with Rear Integration Module (RIM)
U2136 00Lost Communication with Memory Mirror Module (MMM)
U2137 00Lost Communication with Vehicle Theft Deterrent (VTD)
U2138 00Lost Communication with Column Locking Module (CLM)
U2139 00Lost Communication with Column Integration Module (CIM)
U2140 00Lost Communication with Underhood Electrical Center (UEC)
U2141 00Lost Communication with Rear Electrical Center
U2142 00Lost Communication with Yaw Rate Sensor (YRS)
U2143 00Lost Communication with Steering Angle Sensor (SAS)
U2144 00Lost Communication with Distance Sensing Cruise Control Module
U2145 00Lost Communication with Parking Assistance System (PAS)
U2146 00Lost Communication with Shift Lever Module (SLM)
U2147 00Lost Communication with Auxiliary Heater System (AHS)
U2148 00Lost Communication with Sun Roof Module (SRM)
U2149 00Lost Communication with Tire Pressure Monitor (TPM) System
U2150 00Navigation Electronic Control Unit (ECU) Gateway Communications
U2151 00Navigation Electronic Control Unit (ECU) Communications
U2152 00Navigation Bus Request Line Circuit Low
U2153 00Navigation Electronic Control Unit (ECU) - VICS Communication Circuit
U2160 00Lost Communication with Steering Control System Sensor
U2161 00Lost Communication with Dash Integration Module (DIM)
U2162 00Lost Communication with Instrument Panel integration Module (IPM)
U2163 00Lost Communication with Left Rear Door Module (LRDM)
U2164 00Lost Communication with Right Rear Door Module (RRDM)
U2165 00Lost Communication with Driver Door Switch (DDS)
U2166 00Lost Communication with Driver Position Module (DPM)
U2167 00Lost Communication with Remote Control Door Lock Receiver (RCDLR)
U2168 00Lost Communication with Side Object Detection (SOD) Module - Left
U2169 00Lost Communication with Side Object Detection (SOD) Module - Right
U2170 00Lost Communication with Four Wheel Drive (4WD) Clutch
U2171 00Lost Communication with Rear Seat Entertainment (RSE)
U2172 00Lost Communication with Digital Radio Receiver (DRR)
U2173 00Lost Communication with Passive Entry and Passive Start System
U2174 00Lost Communication with Parking Heater System
U2175 00Lost Communication with Special Vehicle Module
U2176 00Lost Communication with Power Take Off (PTO) Control Module
U2177 00Lost Communication with Cruise Control Module
U2178 00Lost Communication with Trailer Interface Module
U2179 00Lost Communication with Television Module
U2180 00Lost Communication with Folding Top Control Module
U2181 00Lost Communication with Moveable Roof Module

Circuit/System Verification

If the DTC is set, replace the appropriate control module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for module replacement, setup, and programming

  1. Program or configure the module or related module that set DTC B1001. The module should successfully configure. If the module will not configure, replace the module that set the DTC.
  2. With a scan tool, clear the DTC.
  3. Ignition OFF, remove the scan tool, open and close the drivers door.
  4. Wait 60 seconds, then recheck for DTCs. DTC B1001 should not set. If DTC B1001 sets, replace the module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup, and programming

Verify that DTC B101D is not set.

  1. If the DTC is set, reprogram the control module with the most current software. If the DTC resets, replace the control module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic repair.

Control Module References for control module replacement, setup, and programming

Verify that DTC B101D is not set.

  1. If the DTC is set, replace the control module that set the DTC.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, setup, and programming

Reference Information

Schematic Reference

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool References

Control Module References for scan tool information

Verify DTC B101E is not set.

  1. If the DTC is set, program the control module. If the DTC resets, replace the control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Hybrid Controls Schematics»(ref-364526-S15400401162010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48569 Terminal Covers
  2. EL-48900 HEV Safety Kit

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

With a scan tool, verify that DTC U182A is not set in the SDGM, and U189A is not set in the HPCM.

  1. If either DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming
  1. With a scan tool, clear DTC C0550. The DTC should clear. If the DTC will not clear, replace the control module.
  2. Ignition OFF, remove the scan tool, open and close the drivers door.
  3. Wait 60 seconds, ignition ON, then recheck for DTCs. DTC C0550 should not set. If DTC C0550 sets, replace the module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup, and programming

Verify that DTC C056D is not set.

  1. If the DTC is set, program the control module. If the DTC resets, replace the control module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

Schematic Reference

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool References

Control Module References for scan tool information

Verify DTC C056E is not set.

  1. If the DTC is set, program the control module. If the DTC resets, replace the control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup, and programming

Action Taken When the DTCs Sets

  1. The module suspends all message transmission.
  2. The MIL and battery indicators will illuminate, along with several DIC messages.
  3. The vehicle may continue to run for several minutes, then will stall and not start.

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

The module uses a default value for the missing parameter.

Diagnosis of this DTC is accomplished via the symptom, DTC U0100-U02FF (with HP2) or DTC U0100-U02FF (without HP2) .

  1. The module suspends all message transmission.
  2. The module uses default values for all parameters received on the serial data circuits.
  3. In the TCM, DTC U0073 will cause the transmission to go into default gears.
  4. In the ECM and TCM, DTC U0073 will cause the malfunction indicator lamp (MIL) to illuminate.
  5. The module inhibits the setting of all other communication DTCs.
  1. Refer to «Data Link References»(ref-364513-S10346047942010063000000) to determine which serial data system is used for a specific control module.
  2. This DTC cannot be retrieved with a current status. Diagnosis is accomplished using the symptom «Scan Tool Does Not Communicate with High Speed GMLAN Device»(ref-364513-S21001330252010063000000) or «Scan Tool Does Not Communicate with Low Speed GMLAN Device»(ref-364513-S36708622582010063000000) .
  1. The module suspends all message transmission.
  2. The MIL and battery indicators will illuminate, along with several DIC messages.
  3. The vehicle may continue to run for several minutes, then will stall and not start.

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC U1814, U2099, B1428, B1370, B1380, B1440, or B1441 is not set.

  1. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for control module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC U1814, U2099, B1428, B1370, B1380, B1440, or B1441 is not set.

  1. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for control module replacement, setup, and programming
  1. Verify that DTC U1500 31 is not set, If the DTC is set, replace the appropriate window motor.
  2. Verify that DTC U1511 is not set in the BCM. If DTC U1511 is set in the BCM, perform the Compass Malfunction Test.
  3. Perform the Window Malfunction Test.

Note. Each window regulator motor or front window and door lock switch, if replaced needs to be setup for proper operation.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Front Side Door Window Regulator Motor Replacement»(ref-364490-S38434074682010063000000)
  2. «Rear Side Door Window Regulator Motor Replacement»(ref-364490-S06060385772010063000000)
  3. «Control Module References»(ref-364489-S22329914082010063000000) for window, and door lock switches (door modules), window regulator motors, or electronic compass module replacement, setup, and programming
  1. The module suspends all message transmission.
  2. The MIL and battery indicators will illuminate, along with several DIC messages.
  3. The vehicle may continue to run for several minutes, then will stall and not start.

Verify that U0074 is not set.

  1. If the DTC is set, refer to «DTC U0074»(ref-364513-S11476954412010063000000)

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Hybrid Controls Schematics»(ref-364526-S15400401162010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)
  1. Verify that DTC U1862 is not set in the HPCM. If the DTC is set, refer to «DTC U1862»(ref-364513-S04467151942010063000000) .
  2. Verify that DTC B137A is not set in the SDG module. If the DTC is set, refer to «DTC B137A»(ref-364513-S38519071092010063000000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Hybrid Controls Schematics»(ref-364526-S15400401162010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Verify that DTC B137A is not set in the SDG module.

  1. If the DTC is set, refer to «DTC B137A»(ref-364513-S38519071092010063000000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

Schematic Reference

  1. DLIS Fuse and Ignition Switch in «Power Distribution Schematics»(ref-364548-S19379194672010063000000)
  2. «Body Control System Schematics»(ref-364513-S03429872972010063000000)
  3. «Data Communication Schematics»(ref-364513-S03343694622010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)
  1. Verify that DTC B137A is not current in the serial data gateway module (SDGM). If the DTC is current in the SDGM, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .
  2. Verify that DTC U1815 is not set current only in the HPCM. If the DTC is current in the HPCM only, replace the drive motor power inverter module (PIM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)
  1. Verify that DTC B137A is not current in the serial data gateway module (SDGM). If the DTC is current in the SDGM, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .
  2. Verify that DTC U1816 is not set current only in the HPCM. If the DTC is current in the HPCM only, replace the drive motor power inverter module (PIM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

With a scan tool, ensure the following DTCs are not present in the modules as follows

HPCM

U189A

SDGM

  1. U182A
  2. U0074
  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC.

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Verify the following DTCs are not set in the modules as follows

  1. PSCM - U0100
  2. SDGM - U189A
  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Special Tools

EL-48900 HEV Safety Kit

Verify DTC U182A is not set in the serial data gateway module (SDGM).

  1. If the DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Antilock Brake System Schematics»(ref-364512-S34823412892010063000000)
  3. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement»(ref-364511-S13891391832010063000000)
  3. «Control Module References»(ref-364489-S22329914082010063000000) for control module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Hybrid Controls Schematics»(ref-364526-S15400401162010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)
  1. Verify that DTC B137A, B137B or U189A is not present in the SDGM. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.
  2. Verify the DTC U0074 is not set. If DTC U0074 is set as a current or history code, refer to «DTC U0074»(ref-364513-S11476954412010063000000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for control module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)
  1. Verify that DTC B137B or U189A are not present in the SDGM. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.
  2. Verify the DTC U0074 is not set. If DTC U0074 is set as a current or history code, refer to «DTC U0074»(ref-364513-S11476954412010063000000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for control module replacement, setup, and programming

The modules is never signaled, therefore the specific subsystems will not function.

Verify that U0100 is not set.

  1. If the DTC is set, refer to «DTC U0100-U02FF (with HP2)»(ref-364513-S41867333272010063000000) or «DTC U0100-U02FF (without HP2)»(ref-364513-S22621777342010063000000)

The modules is never signaled, therefore the specific subsystems will not function.

Verify that U0100 is not set.

  1. If the DTC is set, refer to «DTC U0100-U02FF (with HP2)»(ref-364513-S41867333272010063000000) or «DTC U0100-U02FF (without HP2)»(ref-364513-S22621777342010063000000)

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Hybrid Energy Storage Schematics»(ref-364532-S06321074522010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Verify that DTC U0140 is not set in the electronic brake control module (EBCM).

  1. If DTC U0140 is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .

The modules is never signaled, therefore the specific subsystems will not function.

Verify that U0102 is not set.

  1. If the DTC is set, refer to «DTC U0100-U02FF (with HP2)»(ref-364513-S41867333272010063000000) or «DTC U0100-U02FF (without HP2)»(ref-364513-S22621777342010063000000)

The modules is never signaled, therefore the specific subsystems will not function.

Verify that U0101 is not set.

  1. If the DTC is set, refer to «DTC U0100-U02FF (with HP2)»(ref-364513-S41867333272010063000000) or «DTC U0100-U02FF (without HP2)»(ref-364513-S22621777342010063000000)

With a scan tool, ensure the following DTCs are not present in the modules as follows

BCM

U2099

PSCM

U0146

SDGM

  1. SDGM - U0111
  2. SDGM - B1453
  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

With a scan tool, ensure the following DTCs are not present in the modules as follows

BCM

U1814

SDGM

U0100

  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

With a scan tool, ensure the following DTCs are not present in the modules as follows

BCM

U2099

PSCM

U0146

SDGM

  1. SDGM - U0111
  2. SDGM - B1453
  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

With a scan tool, ensure the following DTCs are not present in the modules as follows

BCM

U1814

SDGM

U0100

  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

Verify the following DTCs are not set in the modules as follows

  1. Verify DTC U0111 is not set in the SDGM. If the DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .
  2. Verify DTC U1888 is not set in the HPCM. If the DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .

With a scan tool, ensure the following DTCs are not present in the modules as follows

BCM

U1814

SDGM

U0100

  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

With a scan tool, ensure the following DTCs are not present in the modules as follows

BCM

U2099

PSCM

U0146

SDG module

  1. SDG module - U0111
  2. SDG module - B1453
  1. If the DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) .

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

With a scan tool, ensure the following DTCs are not present in the modules as follows

  1. BCM - U1814
  2. HPCM - U1812
  3. SDGM - B137A or U209A
  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Schematic Reference

  1. «Body Control System Schematics»(ref-364513-S03429872972010063000000)
  2. «Data Communication Schematics»(ref-364513-S03343694622010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

With a scan tool, ensure the following DTCs are not present in the modules as follows

BCM

  1. U1814
  2. U2099

SDGM

  1. U1812
  2. B1453
  1. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-364486-S07394808542010063000000) to diagnose that DTC prior to this diagnostic.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

GMLAN Wiring Repairs

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

  1. The module suspends all message transmission.
  2. The module uses default values for all parameters received on the serial data circuits.
  3. The module inhibits the setting of all other communication DTCs.

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Antilock Brake System Schematics»(ref-364509-S39596098242010063000000) for the ABS - Hybrid
  3. «Antilock Brake System Schematics»(ref-364511-S21448435952010063000000) for the ABS - Non-Hybrid Less than 3900 kg (8600 lb) GVW
  4. «Antilock Brake System Schematics»(ref-364512-S34823412892010063000000) for the ABS - Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «ABS Description and Operation»(ref-364509-S10573838362010063000000) for the ABS - Hybrid
  3. «Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement»(ref-364511-S13891391832010063000000) for the ABS - Non-Hybrid Less than 3900 kg (8600 lb) GVW
  4. «Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement»(ref-364511-S13891391832010063000000) for the ABS - Non-Hybrid Greater than/Equal to 3900 kg (8600 lb) GVW
  5. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Symptoms - Data Communications

Note. The following steps must be completed before using the symptom tables.

  1. Perform the «Diagnostic System Check - Vehicle»(ref-364486-S08087544882010063000000) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data links.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Data Link Communications Description and Operation»(ref-364513-S22423232842010063000000) .

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Schematic Reference

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information.

Perform the Diagnostic Repair Verification after completing the repair.

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the repair.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for control module replacement, setup, and programming

Schematic Reference

Data Communication Schematics

Connector End View Reference

  1. «Component Connector End Views»(ref-364487-S16896375592010063000000)
  2. «Splice Pack Connector End Views»(ref-364608-S29124234422010063000000)

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Perform the Diagnostic Repair Verification after completing the repair.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for module replacement, setup, and programming

Schematic Reference

  1. «Data Communication Schematics»(ref-364513-S03343694622010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-364488-S04114729552010063000000)
  2. «Connector Repairs»(ref-364488-S23771656832010063000000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-364488-S16423338542010063000000)
  4. «Wiring Repairs»(ref-364488-S17530456672010063000000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the repair.

  1. «GMLAN Wiring Repairs»(ref-364488-S38793742332010063000000)
  2. «Control Module References»(ref-364489-S22329914082010063000000) for control module replacement, setup, and programming

Data Link References

This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .

Control ModuleData Link TypeDiagnostic Procedure
Schematic Reference: Data Communication Schematics
Accessory DC Power Control Module w/ HP2Powertrain High Speed GMLANScan Tool Does Not Communicate with Powertrain High Speed GMLAN Device
AC Compressor w/ HP2Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Assist Step Control ModuleLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Audio AmplifierLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Body Control Module (BCM)High Speed GMLAN Low Speed GMLAN Local Interconnect Network (LIN)Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500, U1511, U1512, or U1513
Digital Radio ReceiverLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Drive Motor Generator Battery Control Module w/ HP2High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Drive Motor Generator Power Inverter Module w/ HP2Powertrain High Speed GMLAN High Speed GMLANScan Tool Does Not Communicate with Powertrain High Speed GMLAN Device Scan Tool Does Not Communicate with High Speed GMLAN Device
Door Lock/Window Switch - DriverLow Speed GMLAN Local Interconnect Network (LIN)Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500, U1511, U1512, or U1513
Door Lock/Window Switch - PassengerLow Speed GMLAN Local Interconnect Network (LIN)Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500, U1511, U1512, or U1513
Electronic Brake Control Module (EBCM)High Speed GMLAN Powertrain High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Powertrain High Speed GMLAN Device
Electronic Compass ModuleLocal Interconnect Network (LIN)DTC U1500, U1511, U1512, or U1513
Electronic Power Steering Motor Control Module w/ HP2High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Electronic Suspension Control (ESC) ModuleHigh Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Engine / Powertrain Control Module (ECM/PCM)High Speed GMLAN Powertrain High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Powertrain High Speed GMLAN Device
Fuel Pump Flow Control ModuleHigh Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Heated Seat Module - RearLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
HVAC Control ModuleLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Sensing and Diagnostic Module (SDM)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Vehicle Rollover SensorLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Inside Rearview Mirror (ISRVM)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Instrument Panel Cluster (IPC)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Memory Seat Module (MSM)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Object Alarm ModuleLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Passenger Presence System (PPS) ModuleLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Power Liftgate ModuleLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
RadioLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Rear Seat Audio (RSA) ControlLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Remote Control Door Lock Receiver (RCDLR)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Serial Data Gateway Module (SDGM) w/ HP2Powertrain High Speed GMLAN High Speed GMLAN Low Speed GMLANScan Tool Does Not Communicate with Powertrain High Speed GMLAN Device Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
Theft Deterrent Module (TDM)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Trailer Brake Control ModuleHigh Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Transfer Case Shift Control ModuleHigh Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Transmission Control Module (TCM)High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Vehicle Communication Interface Module (OnStar® VCIM)High Speed GMLAN - pass through only Low Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
Window Motor - DriverLocal Interconnect Network (LIN)DTC U1500, U1511, U1512, or U1513
Window Motor - PassengerLocal Interconnect Network (LIN)DTC U1500, U1511, U1512, or U1513
Yaw and Lateral Accelerometer Sensor w/ HP2Powertrain High Speed GMLANScan Tool Does Not Communicate with Powertrain High Speed GMLAN Device

Scheme 18

Scheme 18: Auxiliary Body Control Module Replacement (Domestic)
Scheme 18: Auxiliary Body Control Module Replacement (Domestic)
CalloutComponent Name
Preliminary Procedures: Remove the inflatable restraint module. Refer to Instrument Panel Inflatable Restraint Module Replacement .
1Auxiliary Body Control Module Procedure Press on the tabs to release the auxiliary body control module. Disconnect the electrical connectors. Reprogram the auxiliary body control module if replaced. Refer to Control Module References .

Scheme 19

Scheme 19: Auxiliary Body Control Module Replacement (Export)
Scheme 19: Auxiliary Body Control Module Replacement (Export)
CalloutComponent Name
Preliminary Procedure: Remove the knee bolster. Refer to Knee Bolster Replacement (Cadillac) or Knee Bolster Replacement (Except Cadillac)
1Auxiliary Body Control Module Procedure Disconnect the electrical connectors. Press on the tabs to release the auxiliary body control module. If a replacement module is installed, program the module. Refer to Control Module References .

Scheme 20

Scheme 20: Body Control Module Replacement
Scheme 20: Body Control Module Replacement
CalloutComponent Name
Preliminary Procedure: Remove the knee bolster. Refer to Knee Bolster Replacement (Cadillac) or Knee Bolster Replacement (Except Cadillac)
1Body Control Module Tip: Remove the BCM cover. Disconnect the electrical connectors. Press on the tabs to release the body control module. If a replacement module is installed, program the module. Refer to Control Module References .

Power Mode Master

This vehicles body control module (BCM) functions as the power mode master (PMM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination the power mode that will be sent over the serial data circuits to the other modules that need this information, and so the PMM will activate relays and other direct outputs of the PMM as needed. Refer to Power Mode Description and Operation for a complete description of power mode functions.

Body Control Module

The various body control module (BCM) input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. Some BCM functions with the subsystems may be as a gateway only or as an enable for the system. The BCM related systems/subsystems include, but are not limited to the following

  1. Antilock Brake System (ABS)-Refer to «ABS Description and Operation»(ref-364509-S10573838362010063000000) , «ABS Description and Operation»(ref-364511-S16012933352010063000000) or «ABS Description and Operation»(ref-364512-S13888983932010063000000) .
  2. Automatic Day-Night Mirror-Refer to «Automatic Day-Night Mirror Description and Operation»(ref-364480-S41477217512010063000000) .
  3. Cruise Control System-Refer to «Cruise Control Description and Operation»(ref-364550-S15529478612010063000000) .
  4. Electrical Power Management (EPM)-Refer to «Electrical Power Management Description and Operation»(ref-364485-S30805851622010063000000) .
  5. Exterior Lighting-Refer to «Exterior Lighting Systems Description and Operation»(ref-364469-S41985854112010063000000) .
  6. Horn System-Refer to «Horns System Description and Operation»(ref-364502-S06822898342010063000000) .
  7. HVAC-Refer to «Air Delivery Description and Operation»(ref-364529-S24392545842010063000000) and «Air Temperature Description and Operation»(ref-364529-S06818200412010063000000) .
  8. Instrument Cluster Indicator Control-Refer to «Instrument Cluster Description and Operation»(ref-364482-S22515779662010063000000) .
  9. Interior Lighting-Refer to «Interior Lighting Systems Description and Operation»(ref-364469-S39191806792010063000000) .
  10. Power Door Lock System-Refer to «Power Door Locks Description and Operation»(ref-364491-S12329744252010063000000) .
  11. Rear Window Defogger System-Refer to «Rear Window Defogger Description and Operation»(ref-364490-S07222527652010063000000) .
  12. Redundant Steering Wheel Controls-Refer to «Steering Wheel Controls Description and Operation»(ref-364505-S25494613722010063000000) .
  13. Remote Function Actuation (RFA) Control-Refer to «Keyless Entry System Description and Operation (Without Accessory 2 Way Remote)»(ref-364503-S17628476612010063000000) or «Keyless Entry System Description and Operation (With Accessory 2 Way Remote)»(ref-364503-S32389186522010063000000) .
  14. Retained Accessory Power (RAP)-Refer to «Retained Accessory Power Description and Operation»(ref-364609-S20447720352010063000000) .
  15. Shift Lock Control System-Refer to «Automatic Transmission Shift Lock Control Description and Operation»(ref-364551-S12371408032010063000000) .
  16. Starting System-Refer to «Starting System Description and Operation»(ref-364485-S06387335422010063000000) .
  17. Supplemental Inflatable Restraint (SIR) System-Refer to «SIR System Description and Operation»(ref-364477-S37941349742010063000000) .
  18. Suspension System-Refer to «Electronic Suspension Control Description and Operation»(ref-364533-S21848440652010063000000) .
  19. Theft Deterrent-Refer to «Content Theft Deterrent (CTD) Description and Operation»(ref-364571-S38784993962010063000000) .
  20. Tire Pressure Monitor (TPM) System-Refer to «Tire Pressure Monitor Description and Operation»(ref-364517-S28705672392010063000000) .
  21. Wiper/Washer System Functions-Refer to «Wiper/Washer System Description and Operation»(ref-364467-S22118416982010063000000) .

Export Body Control Module

The export body control system has an additional body control module located in the rear of the vehicle. This additional body control module is referred to as the XBCM. The XBCM has discrete input and output terminals to control additional vehicle body functions not supported by the primary body control module (BCM). The XBCM is wired to the low speed GMLAN serial data bus and the BCM and acts as a gateway between them. If the XBCM does not communicate, various rear end lighting such as rear fog lamps and trailer lighting will be impaired.

The various input and output circuits are described in the corresponding functional areas indicated on the XBCM electrical schematics. Some XBCM functions with the subsystems may be as a gateway only or as an enable for the system. The XBCM related systems/subsystems include, but are not limited to the following

  1. Exterior lighting-Refer to «Exterior Lighting Systems Description and Operation»(ref-364469-S41985854112010063000000) .
  2. Instrument cluster indicator control-Refer to «Instrument Cluster Description and Operation»(ref-364482-S22515779662010063000000) .
  3. Theft deterrent-Refer to «Content Theft Deterrent (CTD) Description and Operation»(ref-364571-S38784993962010063000000) .

Serial Data Reference

The scan tool communicates over the various busses on the vehicle. When a scan tool is installed on a vehicle, the scan tool will try to communicate with every module that could be optioned into the vehicle. If an option is not installed on the vehicle, the scan tool will display No COMM for that options specific control module.

In order to avert misdiagnoses of No Communication with a specific module, refer to Data Link References for a list of modules, the busses they communicate with, and the RPO codes for a specific module.

Serial Data Gateway w/o HP2

The body control module (BCM) in this vehicle functions as a gateway or translator. The purpose of the gateway is to translate serial data messages between the high speed GMLAN bus and the low speed GMLAN bus for communication between the various modules. The gateway will interact with each network according to that network's transmission protocol.

One example of this necessary communication is the communication between the engine control module (ECM)/powertrain control module (PCM) which is high speed serial data and Theft Deterrent Module which is low speed serial data. If these modules can not exchange information, the vehicle will not start.

A lost communication DTC typically is set in modules other than the module with a communication failure.

Serial Data Gateway w/HP2

The SDGM in this vehicle functions as a gateway or translator. The purpose of the gateway is to translate serial data messages between the high speed GMLAN serial data bus, the low speed GMLAN serial data bus, and the high speed hybrid GMLAN serial data bus for communication between the various modules. The gateway will interact with each network according to that network's transmission protocol.

Data Link Connector (DLC)

The data link connector (DLC) is a standardized 16-cavity connector. The DLC low speed serial data circuit is connected directly to the instrument panel (I/P) splice then to all other splices or modules. Connector design and terminal location is dictated by an industry wide standard, and is required to provide the following

  1. Terminal 1 low speed GMLAN communications terminal
  2. Terminal 4 scan tool power ground terminal
  3. Terminal 5 common signal ground terminal
  4. Terminal 6 high speed GMLAN serial data bus (+) terminal
  5. Terminal 14 high speed GMLAN serial data bus (-) terminal
  6. Terminal 16 scan tool power, battery positive voltage terminal

With RPO HP2 the DLC also connects the high speed hybrid GMLAN bus to the scan tool for programming purposes. The terminal and circuits are as follows

  1. Terminal 3 high speed hybrid GMLAN serial data bus (+) terminal
  2. Terminal 11 high speed hybrid GMLAN serial data bus (-) terminal

More articles — Data Communication System