P04DE
Cold Start EGR A Flow Excessive Detected
Same as P04DD with EGR flow above the cold-start target - typically valve sticking open during the cold phase or position sensor offset low.
Same as P04DD with EGR flow above the cold-start target - typically valve sticking open during the cold phase or position sensor offset low.
Common causes
- high
EGR valve A sticking open when cold
One of the most commonly reported causes for this code — check this first.
Typical part cost: $280-1320
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P04DE mean?
P04DE means "Cold Start EGR A Flow Excessive Detected". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P04DE?
egr valve a sticking open when cold — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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