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 MANUALSCHEVROLET2012EXPRESS 3500 V8-4.8LREPAIR AND DIAGNOSISRESTRAINTS AND SAFETY SYSTEMSAIR BAG SYSTEMSTESTING AND INSPECTIONPROGRAMMING AND RELEARNING
2012 Chevrolet Express 3500 V8-4.8L
Programming and Relearning
2012 Chevrolet Express 3500 V8-4.8LSECTION Programming and Relearning
Passenger Presence System Programming and Setup
Important:
Before performing the preload procedure the passenger presence system (PPS), the front passenger seat must be completely empty of all items. The presence of any items on the front passenger seat will affect the calibration and operation of the PPS. When performing the PPS preload procedure, the instrument panel cluster (IPC) and dash lights will begin dimming ON and OFF. This is normal operation during the preload procedure and does not indicate additional system faults.
If the PPS is replaced or serviced, perform the preload procedure for the PPS. Refer to Passenger Presence System Preload Test Passenger Presence System Preload Test for the rezeroing procedure.
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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.