P24BC code meaning
EVAP System Leak Detection Pump Pressure Sensor Circuit Intermittent
Powertrain system Generic code P24xx codes Check engine light
What P24BC means
P24BC is meant for a pressure signal from the leak check module that drops out or jumps briefly, too short to latch the low or high limit. No manufacturer documents P24BC publicly. The closest published logic is Mitsubishi's noise check on the same sensor in the 2023 Outlander PHEV, which counts signal crossings during the engine-off test and fails above 20 events, but Mitsubishi reports that under P24B9. CARB expects EVAP sensors to be watched for circuit faults as well as erratic behaviour. Because the fault comes and goes, check the harness near the canister and fuel tank for chafing, water in the connector and loose terminals before replacing the module. Steady faults are P24BA (low) and P24BB (high).
P24BC 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 P24BC
- Malfunction indicator lamp on, sometimes going out again
- EVAP readiness monitor completes only occasionally
Common causes of P24BC
- Most likelyLoose or spread terminal in the leak check module connector
- PossibleHarness chafing near the canister or tank, intermittent short or break
- PossibleWater or corrosion in the module connector
- Less likelySensor in the leak check module failing intermittently
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP leak detection pump pressure sensor
What each part of P24BC 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). |
| BC | The exact fault in that area. |
What to do next
- Note P24BC 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 P24BC
What does P24BC mean?
P24BC means "EVAP System Leak Detection Pump Pressure Sensor Circuit Intermittent". P24BC is meant for a pressure signal from the leak check module that drops out or jumps briefly, too short to latch the low or high limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P24BC?
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 P24BC fail an emissions test?
Yes, it can. P24BC 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 P24BC 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 P24BC 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.