What does code U3561 mean?

Q: What does code U3561 mean?

Cathode Bypass Valve Control Circuit. The powertrain control module (PCM) monitors the electrical circuit that operates the cathode bypass valve, which is used in some emissions control systems to manage gas flow through a bypass path. The code sets when the PCM detects an unexpected voltage, current draw, or open/short condition on the control circuit that falls outside the expected range for the commanded state. This is a generic circuit fault, so it can appear on any vehicle that uses a cathode bypass valve, regardless of make or model.

DTC codes / U35xx · Network communication / U3561

U3561Cathode Bypass Valve Control Circuit

The powertrain control module (PCM) monitors the electrical circuit that operates the cathode bypass valve, which is used in some emissions control systems to manage gas flow through a bypass path. The code sets when the PCM detects an unexpected voltage, current draw, or open/short condition on the control circuit that falls outside the expected range for the commanded state. This is a generic circuit fault, so it can appear on any vehicle that uses a cathode bypass valve, regardless of make or model.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.