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Check Engine Light With Code P0400 on Ford Fusion

Problem overview

The Check Engine Light may illuminate with code P0400 stored for an exhaust gas recirculation (EGR) fault. Our technicians tell us if no EGR system faults are noted, updated powertrain control module (PCM) is available which should correct this issue.

19 people reported this problem

6 comments

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Ford Fusion vehicles with this problem

5 model years affected

Average mileage: 51,594 miles

(30 - 91,000)

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Submitted by Jim Taddei · Dec 16, 2025

Published by RepairPal

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Check Engine Light With Code P0400 on Ford Fusion

Problem overview

Ford Fusion vehicles with this problem

Repairs related to this problem

EGR Valve Replacement

Need a diagnosis? Trust our Ford experts.

Search for another problem

Ask our experts about your Ford.