P0487
EGR Throttle Control Circuit A/Open
The drive circuit of EGR throttle A is open. EGR throttles partially close intake to increase exhaust gas recirculation flow at low loads.
- 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.
- Actuator winding openCommon
Parts involved
- EGR Throttle A
P0487 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.