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 MANUALSCHEVROLET2001EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISACCESSORIES AND OPTIONAL EQUIPMENTANTITHEFT AND ALARM SYSTEMSDESCRIPTION AND OPERATIONTHEFT SYSTEMSTHEFT DETERRENT CONTROL MODULE (PASSLOCK(TM) MODULE)
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Theft Deterrent Control Module (Passlock(TM) Module)
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Theft Deterrent Control Module (Passlock(TM) Module)
The theft deterrent control module (Passlock(TM) Module) contains the logic of the theft deterrent system. The Passlock(TM) Module provides the battery positive voltage to operate the Passlock(TM) sensor. The Passlock(TM) Module also measures the voltage of the security sensor signal circuit. The voltage measured will indicate whether the Passlock(TM) sensor has been activated and whether the resistance value from the sensor is a valid value or the tamper value. If voltage measured is in the valid range, the Passlock(TM) Module compares this voltage (voltage code) to a previously learned voltage code. If the voltage codes match, the Passlock(TM) Module sends a class 2 message containing a password to the PCM. If the voltage codes do not match, or the voltage is in the Tamper range, or there is a circuit fault, the Passlock(TM) Module will not send the correct password to the PCM, and the vehicle will not start.
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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.