P243E code meaning
Particulate Filter Regeneration Incomplete (Bank 2)
Powertrain system Generic code P24xx codes Check engine light
What P243E means
P243E is set when the second filter strand has finished regenerating but the soot was not burned off as planned. CARB requires a malfunction to be flagged whenever the filter does not regenerate properly under the manufacturer's intended conditions. Public manufacturer material covers only bank 1 here: for P24A2, Ford's 2023 diesels evaluate each regeneration, allow up to 40 minutes and store a fault if the soot estimate at the end is still above a threshold. Regenerations cut short by brief trips or switching off are the usual reason, followed by too little heat on that bank, a faulty temperature or pressure sensor or a fuel dosing problem. Ignored, the filter keeps loading until P243F or a power limit follows.
P243E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P243E
- MIL on, filter warning
- Regeneration restarts soon after the last one
- Rising soot load in live data
Common causes of P243E
- Most likelyRegenerations interrupted by short trips or engine shut-off
- PossibleToo little heat on bank 2 (catalyst, post-injection or dosing fault)
- PossibleFaulty temperature or differential pressure signal
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
DPF b2
What each part of P243E 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). |
| 3E | The exact fault in that area. |
What to do next
- Note P243E 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 P243E
What does P243E mean?
P243E means "Particulate Filter Regeneration Incomplete (Bank 2)". P243E is set when the second filter strand has finished regenerating but the soot was not burned off as planned. It is a generic code, so it means the same on every make.
Is it safe to drive with P243E?
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 P243E fail an emissions test?
Yes, it can. P243E 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 P243E to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P243E 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.