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 |
| 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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| K17 | Electronic Brake Control Module |
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| K20 | Engine Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K36 | Inflatable Restraint Sensing and Diagnostic 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 |
| 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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| K85 | Passenger Presence Detection Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| P16 | Instrument Cluster | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
Use the Manual With the Right Hardware
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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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