2020 Ram P0401: What It Means & Is It Safe to Drive?
P0401 on the 2020 Ram: Exhaust Gas Recirculation Flow Insufficient. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe 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 on the 2020 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 2020 Ram, repairs for P0401 typically fall between $150 and $600, depending on the root cause and labor rates in your area.
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