Chevy Tahoe airbags and seat belts, inspected and tested

What happens to your Tahoe's module after a crash

The Chevrolet Tahoe uses the SDM, GM's Sensing and Diagnostic Module, as the control unit for its supplemental restraint system. It monitors the impact sensors around this big SUV, decides whether to fire the front airbags, side curtains, and seat belt pretensioners, and the instant it commands a deployment, it records that event permanently in its own memory.

That recorded crash data is why the airbag light stays lit after a collision. The Tahoe's SDM reads its own deployment history, sets hard codes, and locks. Because the data is held at the module level, a regular OBD2 scanner cannot erase it. The light stays on through every key cycle until the module itself is reset.

We put your original Tahoe SDM in our shop, clear the locked crash data and hard codes, and hand it back reading factory-ready. It keeps its original GM calibration and your VIN, so it plugs back into your truck and works on the first key cycle. You reinstall the same module GM built for that Tahoe.