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)PROGRAMMINGAUTO LEARN
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Auto Learn
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Auto Learn
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.
NOTE:
This procedure allows relearning of PASSLOCK(R) module or VCM learned data code after replacement of PASSLOCK(R) module, PASSLOCK(R) sensor or VCM. DTC B3031 will set when entering programming mode.
- Clear all DTCs. See scan tool manufacturer's instructions. Turn ignition off. Replace component(s) as necessary.
- With transmission in Park (A/T) or Neutral (M/T), turn ignition switch momentarily to START position (DO NOT start engine). Leave ignition in RUN position (engine off). If PASSLOCK(R) sensor was replaced, SECURITY indicator light will flash for 10 minutes. If PASSLOCK(R) module was replaced, SECURITY indicator light will flash for a few seconds, then stay on for 10 minutes. If VCM was replaced with a new VCM, vehicle may start and procedure may not be needed. If replacement VCM was used even momentarily, SECURITY indicator light will flash for a few seconds, then stay on for 10 minutes. After 10 minutes, when light turns off, turn ignition switch to OFF position for 10 seconds.
- Repeat step 2) twice more. Auto learn procedure will be completed during next start attempt. Clear all DTCs. If VCM was replaced, reprogram VCM. See appropriate TESTS W/CODES
article in ENGINE PERFORMANCE section:
- TESTS W/CODES - 4.3L
- TESTS W/CODES - 5.0L
- TESTS W/CODES - 5.7L
- TESTS W/CODES - 7.4L
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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.