Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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 Schematics | |||
| A11 | Radio | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| A22 | Radio Controls | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| A26 | HVAC Controls | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| B99 | Steering Wheel Angle Sensor | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device |
| B119 | Multi-axis Acceleration Sensor | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device |
| K9 | Body Control Module |
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| K16 | Battery Energy Control Module |
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| K17 | Electronic Brake Control Module |
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| K19 | Suspension Control Module |
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| K20 | Engine Control Module |
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| K27 | Fuel Pump Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K29 | Seat Heating Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K33 | HVAC Control Module |
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| K36 | Inflatable Restraint Sensing and Diagnostic Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K41 | Front and Rear Parking Assist Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K41R | Rear Parking Assist Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K43 | Power Steering Control Module | High Speed GMALN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K59 | Starter/Generator Control Module |
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| K71 | Transmission Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K73 | Telematics Communication Interface Control Module |
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| K83 | Parking Brake Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K84 | Keyless Entry Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K85 | Passenger Presence Detection 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 (without HP6) | DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus without HP6) (without HP6) |
| M69 | Sunroof Motor | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M74D | Window Motor - Driver | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M74P | Window Motor - Passenger | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| P2 | Transmission Shift Lever Position Indicator | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| P16 | Instrument Cluster | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| P17 | Info Display Module | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| S56 | Radio Control Multifunction Switch | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| S79D | Window Switch - Driver | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| S79LR | Window Switch - Left Rear | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| S79RR | Window Switch - Right Rear | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| T11 | Multimedia Player Interface Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.