OBD-II code · Powertrain (generic)
P04DA Closed Loop EGR Control At Limit Flow Too High
Same as P04D9 with the controller fully closing the actuator yet still measuring more EGR flow than required. The valve does not seat fully, or position feedback under-reads.
Is it safe to drive with P04DA?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyValve does not seat fully (debris or wear)
- PossiblePosition sensor offset
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Valve A, Egr Position Sensor A
Related codes
- P04D7Exhaust Brake Input Circuit Intermittent or Erratic
- P04D8Excessive Time To Enter Closed Loop EGR Control
- P04D9Closed Loop EGR Control At Limit Flow Too Low
- P04DBCrankcase Ventilation System Disconnected
- P04DCFuel Fill Door Position Sensor Circuit Range or Performance
- P04DDCold Start EGR A Flow Insufficient Detected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.