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 |
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| A12 | Digital Radio Receiver Control Module | Mid Speed GMLAN | DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus) |
| A13 | Rear Audio Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| A20 | Radio/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 |
| B117 | Rain Sensor | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| B119 | Multi-axis Acceleration Sensor | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device |
| B191 | Ultrasonic Receiver | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| B233B | Radar Sensor Module - Long Range | Object Bus | DTC U0075 |
| B233LF | Radar Sensor Module - Short Range Left Front | Object Bus | DTC U0075 |
| B233RF | Radar Sensor Module - Short Range Right Front | Object Bus | DTC U0075 |
| B233R | Radar Sensor Module - Short Range Rear | Object Bus | DTC U0075 |
| K9 | Body 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 | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K27 | Fuel Pump Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K28 | Headlamp Leveling Control Module |
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| K29R | Seat Heating Control Module - Rear | 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 |
| K39 | Liftgate Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K40 | Seat Memory Control Module |
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| K41 | Front and Rear Parking Assist Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K47 | Rear Differential Clutch Control Module |
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| K60 | Steering Column Lock Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K61 | Sunroof Control Module | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K62 | Sunroof Sunshade Motor Module | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K68 | Trailer Lighting Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| 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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| K82 | Mobile Telephone Control Module | Mid Speed GMLAN | DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus) |
| 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 |
| K109 | Frontview Camera Module | Object Bus | DTC U0075 |
| K124 | Active Safety Control Module |
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| M3L | Headlamp Horizontal Motor - Left | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M3R | Headlamp Horizontal Motor - Right | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M29L | Headlamp Leveling Actuator - Left | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M29R | Headlamp Leveling Actuator - Right | 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 |
| P4 | Security Siren | 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 |
| S79D | Window Switch - Driver | 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 |
| T11 | Multimedia Player Interface Module |
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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.
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