i had the same problem. my cd player showed the same error message. the pontiac dealer did a swap for a reconditioned unit for about $300. this left me with steering wheel controls that still work, and it still looks like it belongs there as opposed to an after marketunit.
2000 gtp daytona
3.4 pulley, cold air box, tb spacer,over size wp pulley, tog headers, r/t down pipe and high flow cat, resonator removed and replaced with 3" pipe.