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TuningBot DTC Database · v4.37.15

U3563 Cathode Bypass Valve Position Sensor Circuit

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

U · NetworkNetworkOBD2

What U3563 means

U3563
Cathode Bypass Valve Position Sensor Circuit Generic · network Data confidence 65%

The control module detected improper operation of the Cathode Bypass Valve Position circuit.

Symptoms

  • Multiple warning lamps possible
  • Functions of the affected module unavailable

Possible causes

  • CAN bus wiring fault (open, short, chafed harness)
  • Faulty control module loading the bus
  • Connector or terminal corrosion
  • Power supply or ground fault of a module

Recommended checks

  • Perform a full-module scan to map which modules communicate
  • Check CAN bus resistance and voltages at the diagnostic connector
  • Inspect wiring and connectors of the affected module
  • Check module power supply and grounds
  • Disconnect suspect modules one at a time only with a documented procedure

Related and nearby codes

U35 range
U3500U3501U3502U3503U3504U3505U3506U3507U3508U3509U350AU350BU350CU350DU350EU350FU3510U3511

How to read U3563

U

Network: communication between control units.

3

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

563

Specific fault index within the subsystem.

Frequently asked questions about U3563

What does U3563 mean?

Cathode Bypass Valve Position Sensor Circuit. The control module detected improper operation of the Cathode Bypass Valve Position circuit.

Is U3563 generic or manufacturer-specific?

U3563 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U3563 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 U3563 is removable in your case.

Other file services

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