U0690Lost Communication With EGR Temperature Sensor D
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine light
- EGR cooler check incomplete
- Likely causes
- LikelyWiring to sensor D damaged
- PossibleConnector loose or corroded
- PossibleSensor electronics failed
- 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: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.