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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 3 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 8.1L)PROGRAMMINGTHEFT DETERRENT SYSTEM COMPONENTS
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Theft Deterrent System Components
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Theft Deterrent System Components
WARNING: This page is about a different variant/trim than selected.
NOTE:
This procedure allows relearning of Passlock™ module or Powertrain Control Module/Vehicle Control Module (PCM/VCM) learned data code after replacement of Passlock™ module, Passlock™ sensor or PCM/VCM. DTC B3031 will set when entering programming mode.
- Clear all DTCs. Turn ignition off. Replace component(s) as necessary.
- With transmission in Park (A/T) or Neutral (M/T), momentarily turn ignition switch to START position (engine will not start). Leave ignition switch in RUN position (engine off). If Passlock™ sensor was replaced, SECURITY indicator light will flash for 10 minutes. If Passlock™ module was replaced, SECURITY indicator light will flash for a few seconds, and then remain on for 10 minutes. If PCM/VCM was replaced with a new PCM/VCM, vehicle may start and procedure may not be needed. If replacement PCM/VCM was used even momentarily, SECURITY indicator light will flash for a few seconds, and then remain on for 10 minutes. After 10 minutes, when light turns off, turn ignition switch to OFF position for 5 seconds.
- Repeat step 2 2 more times. Ignition switch must be turned to OFF position. Auto learn procedure will be completed during next start attempt. Clear all DTCs.
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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.