P0404: Exhaust Gas Recirculation (EGR) Circuit Range/Performance
The EGR valve isn't moving to the position the engine computer commands. Very common on diesels from soot.
Green, yellow, red: three ways P0404 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set once, runs fine.
Schedule a repair
Rough running or power loss. Get it cleaned or replaced.
Stop and get help
Derate or stalling. Stop and get help.
Symptoms you might notice
- Rough idle
- Power loss
- On diesels: derate and more regens
Common causes, cheapest first
- Soot-stuck EGR valve
- Failing EGR valve motor or position sensor
- Wiring problem
What you can check before calling
- Note power loss or rough idle
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More egr codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0404 mean?
P0404 means "Exhaust Gas Recirculation (EGR) Circuit Range/Performance". The EGR valve isn't moving to the position the engine computer commands. Very common on diesels from soot.
Can I drive with code P0404?
It depends on what the vehicle is doing. Green: Set once, runs fine. Yellow: Rough running or power loss. Get it cleaned or replaced. Red: Derate or stalling. Stop and get help.
What causes P0404?
The most common causes are: soot-stuck EGR valve; failing EGR valve motor or position sensor; wiring problem.
Is P0404 a serious code?
It can be. Derate or stalling. Stop and get help.
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