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P0403 fault code: what it means

P0403: EGR valve control circuit fault.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. failed EGR valve solenoid or motor
  2. damaged or corroded wiring at the EGR valve
  3. carbon binding the valve

P0403 by make

Audi

EGR valve circuit or valve fault. On common-rail TDI this is usually the electric EGR valve on the intake manifold.

Usual causes: EGR valve stuck or failed; wiring or plug to the EGR valve; blown fuse

BMW

EGR valve control circuit fault.

Usual causes: EGR valve motor/actuator failed; wiring or connector

Ford

EGR control circuit fault: an electrical problem in the EGR valve's motor circuit.

Usual causes: failed EGR valve or its motor; carbon making the EGR valve stick; EGR wiring or plug

GWM

EGR control circuit.

Usual causes: failed EGR valve; wiring or connector

Land Rover

EGR control circuit fault. On Discovery 3 TDV6 often brings limp mode.

Usual causes: EGR valve (solenoid is part of the valve); wiring or connector fault; low battery voltage upsetting modules

LDV

EGR control circuit.

Usual causes: failed EGR valve; wiring or connector

Mitsubishi

EGR control circuit fault (electrical).

Usual causes: failed EGR valve motor or solenoid; EGR wiring or connector fault; carbon jamming the valve and overloading the motor

Nissan

EGR valve control circuit fault (YD25 electric EGR valve).

Usual causes: failed EGR valve motor; EGR wiring or connector fault; EGR valve needs relearn after replacement

Skoda

EGR valve circuit or valve fault. On common-rail TDI this is usually the electric EGR valve on the intake manifold.

Usual causes: EGR valve stuck or failed; wiring or plug to the EGR valve; blown fuse

Volkswagen

EGR valve circuit or valve fault. On common-rail TDI this is usually the electric EGR valve on the intake manifold.

Usual causes: EGR valve stuck or failed; wiring or plug to the EGR valve; blown fuse

Volvo

EGR control circuit fault.

Usual causes: failed EGR valve; wiring or connector fault

What the repair usually costs

Not sure what P0403 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.