P0487EGR Throttle Control Circuit A/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. The EGR throttle is a regulating flap ahead of the intake manifold on diesels: by closing partly it lowers manifold pressure below exhaust back pressure so that enough exhaust is recirculated, and it also helps filter regeneration and shuts off air at engine stop. It is usually a DC motor with position sensor. GM and Ford report this flap under P02E0 ff; no manufacturer document available to us uses this code. P0487 means its drive circuit is open or has a general circuit fault, detected by the output stage. The flap then stays open, so the EGR rate cannot be raised enough and filter regeneration may be blocked.
- What you may notice
- Check engine light on
- Loss of power or limp mode possible
- Shaking when the engine is switched off
- Filter regeneration does not complete
- Likely causes
- LikelyConnector at the flap corroded or loose, wire open
- PossibleFlap actuator motor faulty (winding open)
- RarePneumatic version: vacuum converter faulty
- RareDriver in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.