OBD-II code · Network
U066F Lost Communication With Low Pressure Fuel System Sensor
The vehicle bus reports loss of communication with smart low-pressure fuel system sensor. Lift-pump pressure feedback is unavailable; high-pressure pump and injection switch to a fail-safe map.
Is it safe to drive with U066F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
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
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Low Pressure Fuel Sensor, Vehicle Bus Wiring
Related codes
- U066CLost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B
- U066DLost Communication With Charge Air Cooler Temperature Sensor Bank 1
- U066ELost Communication With Charge Air Cooler Temperature Sensor Bank 2
- U0670Lost Communication With Fuel Temperature Sensor A
- U0671Lost Communication With Fuel Temperature Sensor B
- U0672Lost Communication With Engine Coolant Pump
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.