P241F code meaning
EGR Cooler B Efficiency Below Threshold
Powertrain system Generic code P24xx codes Check engine light
What P241F means
Engines with two EGR loops can carry two coolers; P241F flags that the second one, cooler B, no longer removes enough heat from the recirculated gas. GM's 2020 diesel tables (20OBDG04) pin cooler B to the low-pressure EGR path: efficiency is derived from the gas temperatures before and after the cooler, corrected for flow, averaged and failed below 50 percent, a Type B fault (two trips) with coolant between 60 and 130 °C. The high-pressure cooler is checked there under P2457 against 72.61 percent. Ford monitors its single cooler only under P2457, via outlet temperature over coolant temperature. CARB demands detection of insufficient EGR cooling. Expect higher NOx and a fouled or bypassing cooler.
P241F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P241F
- Check engine light after two trips
- Higher NOx, possibly more frequent DPF regenerations
Common causes of P241F
- Most likelySoot or lacquer deposits on the cooler passages
- PossibleDrifting EGR temperature sensor before or after the cooler
- PossibleWeak coolant flow through the cooler (air pocket, thermostat, pump)
- Less likelyCooler bypass flap not closing
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR cooler b
What each part of P241F 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). |
| 1F | The exact fault in that area. |
What to do next
- Note P241F 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 P241F
What does P241F mean?
P241F means "EGR Cooler B Efficiency Below Threshold". Engines with two EGR loops can carry two coolers; P241F flags that the second one, cooler B, no longer removes enough heat from the recirculated gas. It is a generic code, so it means the same on every make.
Is it safe to drive with P241F?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P241F fail an emissions test?
Yes, it can. P241F 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 P241F to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P241F 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.