What does code P0401 mean on a Volvo and is it safe to drive?
P0401: Exhaust Gas Recirculation Flow Insufficient. Here's what it means on your Volvo, 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 Volvo
- 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 Volvo, 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 Volvo
Volvo diesel D5 engine P0401 involves the EGR cooler and valve. Volvo D5 EGR coolers are prone to cracking past 100k miles—confirm no coolant contamination before cleaning the EGR valve. On petrol Volvo engines, EGR is not used in most markets.
Most commonly affected models
S60 D5 2.4L Diesel 2005–2009XC90 D5 2006–2014V70 D5 2005–2007