What does code P0401 mean on a Jeep and is it safe to drive?
P0401: Exhaust Gas Recirculation Flow Insufficient. Here's what it means on your Jeep, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The EGR system is not flowing enough exhaust gas. Usually due to carbon buildup or a stuck valve.
Common causes for your Jeep
- Carbon-clogged EGR valve or passages
- Faulty EGR valve
- Faulty EGR position or differential pressure sensor
Symptoms
- Check Engine Light
- Rough idle, hesitation
- Knock under acceleration
Typical fixes
- Clean or replace EGR valve
- Clean EGR passages in intake
- Replace EGR sensor if applicable
Repair cost range
For a Jeep, repairs for P0401 often fall between $150 and $600, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Jeep
Jeep 4.0L inline-six P0401 is often caused by a cracked EGR tube at the exhaust manifold connection—inspect the tube before cleaning the valve. On 4.7L V8 Grand Cherokees, EGR passage blockage in the intake manifold requires more thorough cleaning.
Most commonly affected models
Grand Cherokee 4.7L V8 2000–2004Cherokee 4.0L I6 1997–2001TJ Wrangler 4.0L 1997–2002