Data Link References

WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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. This table is used to assist in correcting a communication malfunction between the control module and the scan tool. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .

Control Module	Data Link Type	Diagnostic Procedure
Schematic Reference: Data Link Connector (DLC) Schematics
Audio Amplifier (AMP), w/UQ7 and Y91	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Body Control Module (BCM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Communication Interface Module (OnStar®), w/UE1	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Digital Radio Receiver (DRR), w/U2K	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Driver Door Module (DDM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Electro-Hydraulic Power Steering (EHPS) Module, w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Electronic Brake Control Module (EBCM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Energy Storage Control Module (ESCM), w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Engine Control Module (ECM), w/LLY	CAN Class 2	Scan Tool Does Not Communicate with Class 2 Device
Generator Battery Control Module (GBCM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
HVAC Control Module	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Hybrid Control Module (HCM), w/HP2	High Speed GMLAN Class 2	Scan Tool Does Not Communicate with Class 2 Device
Inflatable Restraint Sensing and Diagnostic Module (SDM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Instrument Panel Cluster (IPC)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Memory Seat Module (MSM), w/AN3	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Passenger Door Module (PDM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Powertrain Control Module (PCM)	High Speed GMLAN, w/HP2 Class 2	Scan Tool Does Not Communicate with Class 2 Device
Radio	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Rear Seat Audio (RSA) Controller, w/UK6	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Rear Seat Entertainment (RSE), w/U42	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Rear Wheel Steering Control Module (RWSCM), w/NYS	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Remote Playback Device - CD Player (CDX), w/U1S	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Starter/Generator Control Module (SGCM), w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Transfer Case Shift Control Module (TCSCM), w/NP1, NP8	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Transmission Control Module (TCM), w/M74	CAN Class 2	Scan Tool Does Not Communicate with Class 2 Device