U0669Lost Communication With EGR Sensor D
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Two makers document sensor D as an EGR pressure sensor with SENT output. Ford's 2024–2025 gasoline OBD summary lists U0669 as EGR sensor D communication for the SENT EGR pressure sensor it calls DPFE (range 0.1 to 408.8 kPa): it is checked continuously while the EGR monitor runs and flags a fault when the sensor stops talking or sends corrupt data, after about 5 seconds. Ford's EGR flow test (P0401, P0402) waits until U0669 and the circuit codes P2380 and P2383 have passed. GM's 2025 diesel table 25OBDG04B uses U0669 for the low-pressure EGR delta pressure sensor, Type A, 480 of 600 samples at 6.25 ms. Analog faults are P2380 to P2384, sensor E is U066A. Without the pressure, EGR flow cannot be judged.
- What you may notice
- MIL on
- EGR flow monitor does not run
- Sometimes rough idle or pinging when EGR is shut off
- Likely causes
- LikelySENT, supply or ground line to the EGR pressure sensor damaged
- PossibleConnector at the pressure sensor corroded or loose
- PossibleEGR pressure sensor electronics failed
- 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 · Often possible to do yourself.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.