P045A
EGR B Control Circuit
A general electrical fault on EGR control circuit B — second EGR valve on engines with high-pressure and low-pressure EGR loops.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Common causes
Ordered by how often each turns out to be the cause.
- Solenoid winding faultCommon
Parts involved
- EGR Valve
P045A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.