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TuningBot DTC Database · v4.37.15

U0603 Lost Communication With Fuel Pressure Sensor A

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

U · NetworkFuelOBD2

What U0603 means

U0603
Lost Communication With Fuel Pressure Sensor A Generic · fuel Data confidence 65%

The control module stopped receiving expected network messages from the Fuel Pressure Sensor A 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

Related codes
U0604
U06 range
U0600U0601U0602U0605U0606U0607U0608U0609U060AU060BU060CU060DU060EU060FU0610U0611U0612

How to read U0603

U

Network: communication between control units.

0

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

603

Specific fault index within the subsystem.

Frequently asked questions about U0603

What does U0603 mean?

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

Is U0603 generic or manufacturer-specific?

U0603 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0603 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 U0603 is removable in your case.

Other file services

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

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