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The PCM (Pollution Control Module) needs to be updated for the 2003 Cadillac CTS periodically because this is the part that controls the smog output of a vehicle. It gets dirty and worn out and needs to be replaced from time to time. Some states make this update mandatory in order to get registration for a vehicle.
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Earn +20 ptsQ: Why would PCM need to be updated for 2003 Cadillac CTS?
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