p0401
Moderate
Jeep · SUVs
EGR Insufficient Flow
Quick Answer
Error code P0401 on your Jeep SUVs means: EGR Insufficient Flow. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Inspect EGR valve for carbon buildup
2
Check vacuum supply to EGR valve
3
Test EGR sensor signal voltage
4
Inspect EGR passages for blockage
5
Clean or replace EGR valve and cooler
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
EGR valve
EGR cooler
Vacuum hoses
Gasket set
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