P240F code meaning
EGR Slow Response
Powertrain system Generic code P24xx codes Check engine light
What P240F means
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.
P240F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P240F
- Check engine light
- Hesitation or smoke during load changes
- Engine power derate on heavy trucks
Common causes of P240F
- Most 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)
- Less likelyEngine software requiring an update
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR valve aEGR cooler a
What each part of P240F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 0F | The exact fault in that area. |
What to do next
- Note P240F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P240F
What does P240F mean?
P240F means "EGR Slow Response". P240F means the EGR system takes too long to follow a changed flow target. It is a generic code, so it means the same on every make.
Is it safe to drive with P240F?
Drive gently and only to a workshop. With P240F the car can go into limp mode (reduced power) to protect itself.
Will P240F fail an emissions test?
Yes, it can. P240F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P240F to fix?
Difficulty: medium. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P240F clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.