P0400 means exhaust gas recirculation flow malfunction. General EGR system fault — the computer commanded EGR flow and didn't get the expected result. Could be the valve, the s
You can keep driving — get it checked when convenient.
General EGR system fault — the computer commanded EGR flow and didn't get the expected result. Could be the valve, the sensor, or the plumbing.
Carbon or mechanical failure.
Carbon buildup.
Bad signal.
Open or short in the circuit.
Valve never opens.
Typically $150–$500
Cleaning typically $150–$300; valve replacement typically $250–$500. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.
Safe to drive. Emissions-related; schedule the repair when convenient.
Typically $150–$500. Cleaning typically $150–$300; valve replacement typically $250–$500. Estimates vary by vehicle.
You can keep driving — get it checked when convenient.
The most common cause is stuck egr valve. Carbon or mechanical failure.