P240FEGR Slow Response
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P240F means the EGR system takes too long to follow a changed flow target. CARB has required diesel OBD to catch such slow response since model year 2010. VW's 2014 data call it EGR System Dynamic Check on the 2.0 TDI (CJAA) and rate rising and falling target air mass against a characteristic above 20; the Touareg 3.0 V6 TDI (CNRB) uses 35 for falling and 30 for rising demand. Volvo and Mack 2018–19 trucks may log P240F-00 with P0069, P0191 and P10EC; if two or more appear, solution K33593604 calls for a new engine harness. Hyundai traced it on 2024 Tucson and Sonata 2.5 GDI to an EGR valve sensor fouled by solder flux (24-01-080H). Too little or too much flow: P0401/P0402.
- What you may notice
- Check engine light
- Hesitation or smoke during load changes
- Engine power derate on heavy trucks
- Likely causes
- LikelyCarbon-coated EGR valve moving sluggishly
- PossibleFaulty position sensor in the EGR valve (e.g. Hyundai solder-flux contamination)
- PossibleIntermittent fault in the engine harness (Volvo/Mack D11/D13)
- RareEngine software requiring an update
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.