Hours: 07–23 daily
EN
Tune your file

TuningBot DTC Database · v4.37.15

U0665 Lost Communication With Fuel Rail Pressure Sensor Bank 2

Generic (OBD-II) interpretation in the TuningBot DTC database.

U · NetworkFuelOBD2

What U0665 means

U0665
Lost Communication With Fuel Rail Pressure Sensor Bank 2 Generic · fuel Data confidence 65%

The control module stopped receiving expected network messages from the Fuel Rail Pressure Sensor Bank 2 node on the vehicle communication bus.

Symptoms

  • Possible hard starting or long cranking
  • Possible reduced power or cutting out
  • MIL illuminated

Possible causes

  • Low-pressure fuel supply fault (pump, filter, lines)
  • High-pressure pump wear or fault
  • Pressure regulator / volume control valve fault
  • Fuel pressure sensor fault
  • Internal leakage (injector return flow too high)

Recommended checks

  • Read specified vs actual rail pressure at cranking, idle and load
  • Check low-pressure supply (pressure/volume) first
  • Check control valve/regulator operation
  • Measure injector return flow where applicable
  • Inspect wiring and connectors of pressure components

Related and nearby codes

U06 range
U0600U0601U0602U0603U0604U0605U0606U0607U0608U0609U060AU060BU060CU060DU060EU060FU0610U0611

How to read U0665

U

Network: communication between control units.

0

Generic SAE-standard code: same meaning on every make.

665

Specific fault index within the subsystem.

Frequently asked questions about U0665

What does U0665 mean?

Lost Communication With Fuel Rail Pressure Sensor Bank 2. The control module stopped receiving expected network messages from the Fuel Rail Pressure Sensor Bank 2 node on the vehicle communication bus.

Is U0665 generic or manufacturer-specific?

U0665 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0665 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0665 is removable in your case.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

ECU tuningDyno-tested results by model and engine See the results →

← Search the full DTC database