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Message: <blockquote data-quote="stutaeng" data-source="post: 28141" data-attributes="member: 6175">Are all your tires the same size?If for some reason tires are different size, the vehicles goes bananas. I put a larger tire on our 13 Chrysler minivan because it had a flat tire, and as soon as I took off heading to the tire shop, the brake and ABS lights turned on.I was trying to chase some rear rotor runout on my 06 Suburban and jacked the rear up and "ran it" with the front wheels chocked and same thing happened.Your rear axle doesn't have independent wheel speed sensors, does it?The axle ratio gets stored on the ECU tune, not on the BCM. You can't regear a tune due to smog regulations?</blockquote>