P04DA
Closed Loop EGR Control At Limit Flow Too High
Generic OBD-II
Real-world scan data
Seen in
41
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check for any vacuum leaks or damaged hoses in the EGR system
- Inspect and clean the EGR valve to ensure proper operation
- Verify that the EGR passage in the intake manifold is not clogged or obstructed
- Test the EGR solenoid or control module for proper functionality
- If necessary, replace the EGR valve or other components related to the EGR system
Common causes
Most likely first
- Malfunctioning EGR valve: The EGR valve may be stuck open or not closing properly, causing excessive flow of exhaust gas into the intake manifold.
- Clogged or restricted EGR passages: The passages that allow exhaust gas to flow from the EGR valve to the intake manifold may be blocked, limiting the flow and causing issues with closed loop EGR control.
- Faulty EGR control solenoid: The solenoid responsible for controlling the opening and closing of the EGR valve may be malfunctioning, leading to improper control of the EGR flow.
- Carbon build
- up in the intake manifold or EGR system: Accumulated carbon deposits can obstruct the flow of exhaust gas, disrupting closed loop EGR control and resulting in higher than normal flow.
- EGR system vacuum leak: A vacuum leak in the EGR system, such as a cracked or disconnected hose, can cause an increase in the flow of exhaust gas, exceeding the limit set for closed loop EGR control.
How to diagnose & fix
Work through it in order
- Check Engine Light (MIL) illuminated
- Engine running rough or misfiring
- Decreased fuel efficiency
- Increased exhaust emissions
- Engine stalling or hesitation
Read & clear P04DA yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.