P24BA code meaning
EVAP System Leak Detection Pump Pressure Sensor Circuit Low
Powertrain system Generic code P24xx codes Check engine light
What P24BA means
P24BA reports that the voltage from the leak check module's pressure sensor has fallen below the lowest value a working sensor can produce. In GM's ELCP tables (2018 Volt) the limit is 0.70 V, about 14 % of the reference or roughly 47 kPa absolute, with 640 failures in 800 samples taken every 12.5 ms; the check runs whenever the controller is awake and is Type B. Mitsubishi's 2023 Outlander PHEV sets P24BA when the signal stays under 0.1 V for 2 s. Subaru asks technicians to clear P24BA before chasing P2404 in the ELCM. A low signal mostly means a lost 5 V reference, a signal wire shorted to ground or a dead sensor. P24BB is the high-side counterpart; the leak test is suspended until the fault is gone.
P24BA at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P24BA
- Malfunction indicator lamp on
- EVAP leak test not run
Common causes of P24BA
- Most likelySensor signal wire shorted to ground
- Possible5 V reference open or pulled down by another sensor on the same supply
- PossiblePressure sensor inside the leak check module failed
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 P24BA 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). |
| BA | The exact fault in that area. |
What to do next
- Note P24BA 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 P24BA
What does P24BA mean?
P24BA means "EVAP System Leak Detection Pump Pressure Sensor Circuit Low". P24BA reports that the voltage from the leak check module's pressure sensor has fallen below the lowest value a working sensor can produce. It is a generic code, so it means the same on every make.
Is it safe to drive with P24BA?
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 P24BA fail an emissions test?
Yes, it can. P24BA 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 P24BA to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P24BA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.