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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 75 (ANTI-THEFT SYSTEM)DIAGNOSTIC TESTSDTC B3031: CONTROLLER IN LEARN MODETESTING
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
DTC B3031: Controller In Learn Mode: Testing
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION 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. See SYSTEM CHECK under SYSTEM TESTS. If DTC is a history code, clear codes and repeat SYSTEM CHECK under SYSTEM TESTS. If DTC is not a history code, go to next step.
- Check voltage by backprobing between PASSLOCK(R) sensor 3-pin harness connector terminals D3 (Yellow wire) and C4 (Orange/Black wire) while momentarily turning ignition switch to START position. If voltage is .8-4.3 volts, replace PASSLOCK(R) module and go to step 4). See PASSLOCK(R) MODULE under REMOVAL & INSTALLATION. If voltage is not .8-4.3 volts, go to next step.
- Check PASSLOCK(R) sensor mounting, magnet and other mechanical parts. Repair as necessary. If no problem is found, replace PASSLOCK(R) sensor. 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 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.