U064ELost Communication With EGR Cooler Bypass Position Sensor Bank 1
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Many diesels steer recirculated exhaust around the EGR cooler while the engine is cold and through it once warm, using a bypass flap with its own position sensor. CARB 1968.2 (f)(6.2.5) requires the cooler system to be checked for poor cooling, and that check only makes sense if the controller knows the flap position. U064E is set when this sensor on bank 1 is a digital part and its data no longer arrives. No manufacturer documents U064E publicly, and the published code lists show no separate bank 2 counterpart. An analog sensor would report P2492 to P2496 instead, and a learned end stop outside its limit is P24C4. While the position is unknown, the cooler performance monitor cannot run; warm-up emissions may rise slightly.
- What you may notice
- MIL on
- EGR cooler monitor not completed
- Usually no change in driving behaviour
- Likely causes
- LikelyWiring to the cooler bypass actuator damaged by heat or vibration
- PossibleCorroded or loose connector at the bypass actuator
- PossiblePosition sensor in the bypass actuator failed
- RareEngine controller input 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.