OBD-II code · Network
U0667 Lost Communication With Engine Oil Temperature Sensor A
The vehicle bus reports loss of communication with smart engine oil temperature sensor A. Oil-life model and oil-protection logic switch to a substitute value.
Is it safe to drive with U0667?
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
- 0.5–2 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Engine Oil Temp Sensor A, Vehicle Bus Wiring
Related codes
- U0664Lost Communication With Rear HVAC Air Cutoff Actuator
- U0665Lost Communication With Fuel Rail Pressure Sensor Bank 2
- U0666Lost Communication With Reductant Pressure Sensor
- U0668Lost Communication With Engine Oil Level Sensor Circuit
- U0669Lost Communication With EGR Sensor D
- U066ALost Communication With EGR Sensor E
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.