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.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 352 (DATA LINK COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDATA LINK REFERENCES
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Data Link References
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Data Link References
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
There are modules in this vehicle that communicate on a controller area network (CAN) serial data link. This CAN serial data link is not connected to the data link connector (DLC), and the scan tool cannot communicate on this link. Communication DTCs for this CAN Serial data link may be set by the module acting as an interface to the other serial data links. Refer to Data Link Connector (DLC) Schematics for CAN serial data circuits. The following DTCs may be set when the interface module detects a loss of communication with a module on the CAN serial data link. Diagnose these DTCs as directed in the DTC Table:
For any other U codes or communication problems, refer to the table below for the correct procedure.
CAN Serial Data - Powertrain Control Module (PCM) and Transmission Control Module (TCM)
- DTC U0100, U0101, U0105 or U0106-Refer to DTC U0100-U0299 (Diesel Engine) or DTC U0100-U0299 (HP2)
- DTC U1800, U2105 or U2106-Refer to DTC U1800, U2105, U2106, or U2108
For any other U codes or communication problems, refer to the table below for the correct procedure.
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 .
Data Link References
| Control Module | Data Link Type | Diagnostic Procedure |
|---|---|---|
| Schematic Reference: Data Link Connector (DLC) Schematics | ||
| Audio Amplifier | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Body Control Module (BCM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| CD Player (CDX) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Digital Radio Receiver (DRR) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Driver Door Module (DDM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Driver Seat Module | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Electronic Brake Control Module (EBCM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Energy Storage Control Module (ESCM) | High Speed GMLAN | Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Front Passenger Door Module (PDM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| HVAC Control Module | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Hybrid Control Module (HCM) |
|
Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Inflatable Restraint Sensing and Diagnostic Module (SDM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Instrument Panel Cluster (IPC) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Electro-Hydraulic Power Steering (EHPS) Module | High Speed GMLAN | Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Powertrain Control Module (PCM) |
|
Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Radio | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Rear Seat Audio (RSA) Controller | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Rear Seat Entertainment (RSE) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Rear Wheel Steering Control Module (RWSCM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Starter/Generator Control Module (SGCM) | High Speed GMLAN | Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Transfer Case Shift Control Module (TCSCM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Transmission Control Module (TCM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
| Vehicle Communication Interface Module (VCIM) | Class 2 | Refer to Scan Tool Does Not Communicate with Class 2 Device |
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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.