P0477

Symptoms

• Loss of engine power
• Deterioration in acceleration dynamics
• Increased fuel consumption
• Check Engine Light Illuminates
• Unstable idling

Causes

• Broken or damaged valve wiring harness
• Short circuit in control circuit
• Exhaust gas pressure control valve malfunction
• Problems with the valve connector (oxidation, contamination)
• Malfunction of the engine control unit (ECU)

How to Fix

1. Check the integrity of the valve wiring harness
2. Check valve resistance (compare with manufacturer's standard)
3. Check power supply to valve
4. Clean or replace valve connector if necessary
5. Replace the exhaust gas pressure control valve if it is faulty

Related codes

Error P0477 by Vehicle Brand