2000 Chevrolet Monte Carlo V6 what could the cause be? i have multiple codes

Question

What could the cause be? I have multiple codes I need to figure out; c1298, U1000, p0404. Is there anyone who can help me or give me some advice?

Answer 1

P0404 EGR circuit range performance

C1298 PCM does not receive communication with ABS module

U1000 loss communication

The best direction for these trouble code is to resolve the P0404 this is where the EGR opening or closing  is not where it is expected to be . A failed EGR that does not open to reduce Nox emission or is stuck open either way this is a faulty EGR valve. C1298 the ABS system is in the off state, because there is a DTC code P0404 do that first, U1000 follows C1298.