Data Link References

This table identifies which serial data link that a particular device uses for in-vehicle data transmission. Some devices may use more than one data link to communicate. Some devices 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. Not all devices listed will be applicable to all vehicles. Refer to the schematics to determine which devices apply. For the description and operation of these serial data communication circuits, refer to Data Link Communications Description and Operation .

Code	Device	Data Link Type	Diagnostic Procedure
Schematic Reference: Data Communication Wiring Schematics
A11	Radio	Gateway Isolated Low Speed GMLAN MOST Bus Local Interconnect Network (LIN)	DTC U007D DTC U0028 DTC U1500-U15FF
A26	HVAC Controls	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
B110	Battery Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
B174W	Frontview Camera - Windshield	Gateway Expansion High Speed GMLAN High Speed GMLAN Low Speed GMLAN Object Expansion Bus	DTC U007B Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0075
B218L	Side Object Sensor Module - Left	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B218R	Side Object Sensor Module - Right	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B233B	Radar Sensor Module - Long Range	Object Expansion Bus	DTC U0075
G1	A/C Compressor	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K9	Body Control Module	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-U15FF
K17	Electronic Brake Control Module	High Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0077
K20	Engine Control Module	High Speed GMLAN Powertrain Expansion Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Powertrain Expansion Bus with HP4)DTC U0074 (Powertrain Expansion Bus without HP4) DTC U1500-U15FF
K29	Seat Heating Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K33	HVAC Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
K36	Inflatable Restraint Sensing and Diagnostic Module	Chassis High Speed GMLAN Low Speed GMLAN	DTC U0077 Scan Tool Does Not Communicate with Low Speed GMLAN Device
K40	Seat Memory Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
K43	Power Steering Control Module	High Speed GMALN Chassis High Speed GMALN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0077
K56	Serial Data Gateway Module	Gateway Expansion High Speed GMLAN Gateway Isolated High Speed GMLAN High Speed GMLAN Gateway Isolated Low Speed GMLAN Low Speed GMLAN Chassis High Speed GMLAN	DTC U007B DTC U007C Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U007D Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0077
K71 / T12	Transmission Control Module / Automatic Transmission Assembly	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K73	Telematics Communication Interface Control Module	Gateway Isolated High Speed GMLAN Gateway Isolated Low Speed GMLAN	DTC U007C DTC U007D
K74	Human Machine Interface Control Module	Gateway Isolated High Speed GMLAN MOST Bus Local Interconnect Network (LIN)	DTC U007C DTC U0028 DTC U1500-U15FF
K84	Keyless Entry Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K85	Passenger Presence Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K89	Immobilizer Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K111	Fuel Pump Driver Control Module	Powertrain Expansion Bus	DTC U0074 (Powertrain Expansion Bus with HP4)DTC U0074 (Powertrain Expansion Bus without HP4)
K114B (or K16)	Hybrid/EV Powertrain Control Module 2 (or Battery Energy Control Module)	High Speed GMLAN Low Speed GMLAN Powertrain Expansion Bus (HP4) 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 U0074 (Powertrain Expansion Bus with HP4)DTC U0074 (Powertrain Expansion Bus without HP4) DTC U1500-U15FF
K124	Active Safety Control Module	Gateway Expansion High Speed GMLAN Low Speed GMLAN Object Expansion Bus Chassis High Speed GMLAN	DTC U007B Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0075 DTC U0077
K132	Pedestrian Alert Sound Control Module	Gateway Expansion High Speed GMLAN	DTC U007B
K177	Brake Booster Control Module	High Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0077
K182	Parking Assist Control Module	Chassis High Speed GMLAN Low Speed GMLAN	DTC U0077 Scan Tool Does Not Communicate with Low Speed GMLAN Device
M69	Sunroof Motor	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M96A	Active Grille Air Shutter 1 Actuator	Local Interconnect Network (LIN)	DTC U1500-U15FF
M96B	Active Grille Air Shutter 2 Actuator	Local Interconnect Network (LIN)	DTC U1500-U15FF
P2	Transmission Shift Lever Position Indicator	Local Interconnect Network (LIN)	DTC U1500-U15FF
P16	Instrument Cluster	Gateway Isolated Low Speed GMLAN MOST Bus Local Interconnect Network (LIN)	DTC U007D DTC U0028 DTC U1500-U15FF
P17	Info Display Module	Gateway Isolated Low Speed GMLAN Local Interconnect Network (LIN)	DTC U007D DTC U1500-U15FF
Q35	Exhaust Heat Exchanger Exhaust Bypass Valve	Local Interconnect Network (LIN)	DTC U1500-U15FF
S70R	Steering Wheel Controls Switch - Right	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79LR	Window Switch - Left Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79P	Window Switch - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79RR	Window Switch - Right Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
S146	Window/Outside Rearview Mirror Switch - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
T3	Audio Amplifier	Gateway Isolated Low Speed GMLAN MOST Bus	DTC U007D DTC U0028
T6 (or K114A)	Power Inverter Module (or Hybrid/EV Powertrain Control Module 1)	High Speed GMLAN Powertrain Expansion Bus (HP4) Chassis High Speed GMALN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Powertrain Expansion Bus with HP4)DTC U0074 (Powertrain Expansion Bus without HP4) DTC U0077
T19	Power Supply Transformer	Powertrain Expansion Bus	DTC U0074 (Powertrain Expansion Bus with HP4)DTC U0074 (Powertrain Expansion Bus without HP4)