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.
Circuit/System Description
The inflatable restraint Passenger Presence System (PPS) is a calibrated unit. Anytime the passenger seat bottom cushion or trim attachments have been removed/serviced or the PPS has been replaced, the PPS system must learn the empty seat value by rezeroing. If there is an error during the rezeroing process, the PPS will set DTC 032. DTC 056 will also set indicating a system fault until a successful rezero has been completed. When the PPS detects this DTC within the PPS it will notify the customer of the enable/disable status by turning on the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators, then the PPS will communicate to the sensing and diagnostic module (SDM) through a non GMLAN communications circuit that a PPS fault is present. The SDM will then turn the AIR BAG indicator ON, and set DTC B0081 indicating a problem within the PPS and will suppress the deployment of the instrument panel (I/P) module.
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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.