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U0669 Lost Communication With EGR Sensor D

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

SENT, supply or ground line to the EGR pressure sensor damaged
Connector at the pressure sensor corroded or loose
EGR pressure sensor electronics failed
Engine controller input or software fault

Symptoms

  • MIL on
  • EGR flow monitor does not run
  • Sometimes rough idle or pinging when EGR is shut off

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr sensor dvehicle bus wiring

Related codes

U066AU0653U0651P2380P2381P2382P2383P2384P0401

References: fordservicecontent.com, gsi.ext.gm.com, law.cornell.edu.