What does code P0401 mean on a Ram and is it safe to drive?
P0401: Exhaust Gas Recirculation Flow Insufficient. Here's what it means on your Ram, 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 Ram
- 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 Ram, 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 Ram
Ram 4.7L V8 P0401 is the same EGR tube cracking and carbon blockage issue as Dodge Dakota and Durango with this engine. On Cummins diesel Ram 2500, P0401 relates to the EGR cooler system—a failing EGR cooler is a known Cummins ISB issue that can cause coolant loss.
Most commonly affected models
Ram 1500 4.7L V8 2002–2008Ram 2500 5.9L Cummins 2003–2007