Code result
P04DE
Cold Start EGR A Flow Excessive Detected
Moderate severity
What it means
Same as P04DD with EGR flow above the cold-start target - typically valve sticking open during the cold phase or position sensor offset low.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
EGR valve A sticking open when cold
highOne of the most commonly reported causes for this code — check this first.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P04DE freeNo credit card required