OBD-II code · Network
U0669 Lost Communication With EGR Sensor D
The vehicle bus reports loss of communication with smart EGR sensor D (position or flow). EGR closed-loop control loses its actual feedback.
Is it safe to drive with U0669?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Egr Sensor D, Vehicle Bus Wiring
Related codes
- U0651Lost Communication With EGR Sensor A
- U0652Lost Communication With EGR Sensor B
- U0653Lost Communication With EGR Sensor C
- U066ALost Communication With EGR Sensor E
- U0666Lost Communication With Reductant Pressure Sensor
- U0667Lost Communication With Engine Oil Temperature Sensor A
- U0668Lost Communication With Engine Oil Level Sensor Circuit
- U066BLost Communication With Turbocharger/Supercharger Bypass Valve B Position Sensor
- U066CLost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.