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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 44 (ANTI-THEFT SYSTEM)DIAGNOSTIC TESTSDTC U1016: LOSS OF CLASS 2 COMMUNICATION WITH VCMTESTING
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
DTC U1016: Loss Of Class 2 Communication With VCM: Testing
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Testing
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Perform SYSTEM CHECK under SYSTEM TESTS. Turn ignition off. Disconnect 16-pin PASSLOCK(R) module connector. Check resistance of Purple wire between PASSLOCK(R) module harness connector terminal B4 and DLC terminal No. 2. If resistance is less than 10 ohms, replace PASSLOCK(R) module. See PASSLOCK(R) MODULE under REMOVAL & INSTALLATION. Go to next step. If resistance is 10 ohms or more, repair open in Purple wire. Go to next step.
- Reconnect all connectors and components. Turn ignition on. Using scan tool, clear all DTCs. Perform reprogramming procedure. See PROGRAMMING. Perform system check. See SYSTEM CHECK under SYSTEM TESTS.
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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.