U066ALost Communication With EGR Sensor E
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- EGR sensors A to E are open slots in the code set: each maker decides whether a slot carries a valve position, a pressure or a differential pressure in the recirculation path. U066A means the engine controller no longer gets usable digital frames from the device it calls sensor E, typically a SENT part. No manufacturer documents this code publicly. In the published tables GM gives slot A to the high-pressure valve position and C to the low-pressure one, while Ford and GM use D for a SENT EGR pressure sensor (U0669); an E appears nowhere. CARB demands its own code when a digitally coded input goes silent. Analog faults of this slot are P2385 to P2389. Most systems then cut or limit EGR, and the EGR monitor stays incomplete.
- What you may notice
- Check engine light
- EGR switched off or limited, sometimes harsher combustion noise
- EGR readiness monitor not complete
- Likely causes
- LikelySignal, supply or ground wire to EGR sensor E damaged by heat or chafing
- PossibleConnector at the sensor loose, corroded or contaminated with soot
- PossibleSensor electronics no longer transmitting
- RareEngine controller input or software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.