Fault code P0080 – a step-by-step guide to diagnosing and fixing it

Error code P0080 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the exhaust gas recirculation valve control circuit. The DTC P0080 indicates a problem with the electrical control circuit of the exhaust gas recirculation valve (EGR valve), which impairs the proper functioning of the exhaust gas recirculation.

What can cause this error code?

• Defective EGR valve
• Damaged cable in the EGR control circuit
• Corroded or loose plug connections
• Defective EGR position sensor
• Faulty engine control unit (ECU)
• Blocked EGR lines
• Defective vacuum hoses
• Short circuit or open circuit in the wiring

What symptoms occur in parallel with fault code P0080?

• Unsteady idling: The engine runs unstable or jerks when idling
• Increased emissions: Deteriorated emissions values during the emissions test
• Loss of power: Reduced engine power, especially at low engine speeds
• Knocking noises: Knocking noises from the engine compartment
• Increased fuel consumption: Noticeably higher consumption than usual
• Black smoke: Dark exhaust fumes from the exhaust pipe

How to fix the problem of error code P0080?

• The repair requires a systematic diagnosis of the EGR system to identify the exact cause.
• Replace the EGR valve completely if it is mechanically defective or jammed
• Check all electrical connections and plug connections of the EGR control circuit and replace if corroded or damaged
• Test EGR position sensor separately and replace with a new part if malfunctioning
• Thoroughly clean clogged EGR lines and channels or replace if heavily soiled
• Locate defective vacuum hoses and replace with new, suitable hoses
• Diagnose the engine control unit (ECU) and have it professionally repaired or replaced if defective
• Check the entire wiring of the EGR system for short circuits or interruptions and repair damaged cables