Network, generic

U0690 Lost Communication With EGR Temperature Sensor D

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

Sensor D is the last of the four EGR temperature slots, used only on systems with many measuring points, for example on both sides of a cooler in each of two EGR loops. U0690 says its digital messages have stopped reaching the controller. No manufacturer documents this code publicly, and none of the reviewed GM and Ford tables uses a D position at all. From 2013 on, CARB lists EGR temperature among the values the OBD system must report where fitted, and it requires EGR coolers to be checked for too little cooling; a missing reading can leave that check without data. CARB also asks for a separate code when a digital input falls silent. Analog faults are P04E5 to P04E9, and U068D to U068F cover the other three slots.

Likely causes

Wiring to sensor D damaged

Connector loose or corroded

Sensor electronics failed

Symptoms

Check engine light
EGR cooler check incomplete

Repair estimate

DifficultyMediumDIY possible

Parts and labour€60–400

Time0.5–2 h

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

Parts involved

egr temp sensor dvehicle bus wiring

References: law.cornell.edu, en.wikipedia.org.