OBD
P045A
EGR B Control Circuit
What it means
P045A means EGR B Control Circuit.
Check these first
- A failed EGR valve B
- An open or short in the EGR B control circuit
- Corrosion at the EGR valve B connector
- Low battery voltage
- An ECM fault on the EGR B control
What to do next
- Command EGR valve B with a scan tool and watch the position
- Check the EGR B control circuit for an open or short
- Inspect the EGR valve B connector for corrosion
- Check battery voltage and charging
- Replace EGR valve B if it does not respond
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.