P24BAEVAP System Leak Detection Pump Pressure Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp on
- EVAP leak test not run
- Likely causes
- 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
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.