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 MANUALSCHEVROLET2000C TAHOE 2WD V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICECLASS 2 DEVICE
2000 Chevrolet C Tahoe 2WD V8-5.7L VIN R
Class 2 Device
2000 Chevrolet C Tahoe 2WD V8-5.7L VIN RSECTION Class 2 Device
Diagnostic Chart (Part 1 Of 2):
Diagnostic Chart (Part 2 Of 2):
CIRCUIT DESCRIPTION
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. Connecting a scan tool to the DLC allows communication with the modules for diagnostic purposes. Diagnostic trouble codes (DTCs) may be set due to this symptom and during this diagnostic procedure. Complete the diagnostic procedure in order to ensure all the DTCs are diagnosed and cleared from memory.
DIAGNOSTIC AIDS
^ The VCM (Gas) and PCM (Diesel) detects that the ignition is ON and sends the appropriate power mode message to the other modules. Therefore, the VCM (Gas) and PCM (Diesel) must be connected to the DLC for any other module to communicate with the scan tool.
^ When the class 2 serial data circuit is shorted to ground, U1300 or U1305 will be set. Refer to DTC U1300 Class 2 Data Link Low or DTC U1300 Class 2 Data Link Low.
^ When the class 2 serial data circuit is shorted to B+ U1301 or U1305 will be set. Refer to DTC U1301 Class 2 Data Link High or DTC U1301 Class 2 Data Link High.
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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.