My 2003 CTS codes are coming up;

AMP 09354908 20C0

ARS 25744211 0951

and etc ??? there not like P something
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Press F1 and F6 on the radio and hold it when the car is on... then press the VOLUME SEL in when you highlight a * code, then write all the codes down and put them up here... then clear the codes, and re-do the steps and write THOSE codes down. Let us know what they are.

Codes will look like P2500C, P0128H, etc