U0669 code meaning
Lost Communication With EGR Sensor D
Network system Generic code U06xx codes Check engine light
What U0669 means
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.
U0669 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0669
- MIL on
- EGR flow monitor does not run
- Sometimes rough idle or pinging when EGR is shut off
Common causes of U0669
- Most likelySENT, supply or ground line to the EGR pressure sensor damaged
- PossibleConnector at the pressure sensor corroded or loose
- PossibleEGR pressure sensor electronics failed
- Less likelyEngine controller input or software fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR sensor dVehicle bus wiring
What each part of U0669 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 69 | The exact fault in that area. |
What to do next
- Note U0669 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0669
What does U0669 mean?
U0669 means "Lost Communication With EGR Sensor D". Two makers document sensor D as an EGR pressure sensor with SENT output. It is a generic code, so it means the same on every make.
Is it safe to drive with U0669?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U0669 fail an emissions test?
Yes, it can. U0669 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0669 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0669 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.