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2003 GMC Yukon Denali XL occasionally starts and says stability system disabled. Then the anti theft light comes on as well as the traction control light. It only happens occasionally, and there doesn’t seem to be a more often occurrence with one key as opposed to the other. Any ideas?
It could be one of your wheel speed sensors is going bad or dirty. If you have a quality bi-directional scanner, it should point you to the source of the trouble codes.
Mine flashes those warnings intermittently, but the lights don't stay on nor do they throw a scannable code. Could be a speed sensor like Joseph stated or possibly a ride-height sensor or other autoride component. I would start there.
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