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 MANUALSGMC1998ENVOY 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESCLASS 2 SERIAL DATA COMMUNICATION
1998 GMC Envoy 2WD V6-4.3L VIN W
Class 2 Serial Data Communication
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION Class 2 Serial Data Communication
The Class 2 network continually monitors various subsystems (i.e. ATC, BCM, HVAC, IPC, PCM, and VCM) and operating conditions for possible system malfunctions. Compare the system conditions against standard operating limits in order to detect certain circuit and component malfunctions. A 5 digit alphanumeric Diagnostic Trouble Code (DTC) is stored in the computer memory. When a malfunction is detected by this self-diagnostic system, the DTC(s) may later be retrieved by the service technician using a scan tool. The scan tool may aid the technician in repairing various subsystems.
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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.