99 Pontiac Grand prix gt.amber abs and traction control light stays on most of the time%2Cif it%27s cold out everything works fine until under hood temp warms up then the amber and trac light comes on.All
Had exactly the same problem with my 99 gt after scanning the control unit it came up with a code,p0550,ABS control module internal failure,in Canada it cost 1400$ to fix may be cheaper in the US.
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