P24D9 code meaning
EVAP System Pressure Sensor/Switch B Circuit Intermittent
Powertrain system Generic code P24xx codes Check engine light
What P24D9 means
P24D9 covers a sensor B signal that keeps flickering instead of failing outright. Mitsubishi's 2023 Outlander PHEV runs this check once per drive cycle inside the parked leak test, when the controller wakes at its scheduled times and coolant and intake air lie between 4 and 35 °C. It counts how often the tank pressure signal crosses the sensor's own filter value and stores the code after more than 20 crossings; the display then asks for a refuelling-system service. The service hints name the tank pressure sensor, the tank differential pressure sensor and their wiring. Shaking the harness while watching live data often reveals the spot. Steady low or high voltages fall under P24D7 or P24D8, implausible but stable readings under P24D6.
P24D9 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P24D9
- Malfunction indicator lamp on
- Refuelling system service message on the display
Common causes of P24D9
- Most likelyLoose terminal or poor contact at the tank pressure sensor
- PossibleHarness chafed along the fuel tank
- PossibleTank pressure or tank differential pressure sensor unstable
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP pressure sensor b
What each part of P24D9 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). |
| D9 | The exact fault in that area. |
What to do next
- Note P24D9 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 P24D9
What does P24D9 mean?
P24D9 means "EVAP System Pressure Sensor/Switch B Circuit Intermittent". P24D9 covers a sensor B signal that keeps flickering instead of failing outright. It is a generic code, so it means the same on every make.
Is it safe to drive with P24D9?
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 P24D9 fail an emissions test?
Yes, it can. P24D9 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 P24D9 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P24D9 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.