U3561

Cathode Bypass Valve Control Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased fuel consumption
Reduced engine power
Check Engine light comes on
Unstable engine operation at idle
Problems starting the engine

Causes

Cathode bypass valve failure
Open or short circuit in control circuit
Poor contact in circuit connectors
Control unit malfunction
Wiring harness damage

How to Fix

Check valve control circuit integrity
Check the condition of connectors and contacts
Test valve resistance
Check valve operation using diagnostic equipment
If necessary, replace the cathode bypass valve

Related codes

U3560 U3562 U3550