Mercedes-Benz Sprinter Fault Code
Free · no signupP0404
Rough idle; Black smoke; Surging at highway speeds.
System
EGR System
Symptom
Rough idle; Black smoke; Surging at highway speeds.
Diagnosis & fix steps
EGR Control Circuit Range/Performance.
LOGIC: The EGR valve is sticking due to carbon buildup.
Red Seal field insights
These valves get "coked up" with soot. You can often save the valve by removing it and cleaning it with carburetor cleaner and a brass brush. Ensure the valve moves freely by hand before reinstalling.
Same code keeps coming back?
That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.
Read before you touch anything
- This is general reference information, not a repair manual. It is for trained, qualified technicians.
- Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
- Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
- You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
- Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.
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