What it means
Same as P24D5 with the signal in plausible range yet not matching the engine model. The evaporative system captures fuel vapor from the tank and purges it into intake; leaks or stuck purge valves leak hydrocarbons and cause emissions failures.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
EVAP pressure sensor or switch B monitors pressure in a secondary part of the fuel-vapor control system. This code sets when its signal is electrically plausible but does not behave as expected for the system's operating conditions, which can point to sensor drift, a hose problem, or an EVAP fault.
Common causes
Most likely first.
- Pressure sensor or switch drift or failure
- Restricted or damaged pressure-sensing hose
- Loose or corroded connector
- Pressure signal affected by an EVAP system fault
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
How to diagnose it
- Review freeze-frame data and live EVAP pressure readings to identify the conditions when sensor B's response did not match expectations.
- Compare sensor B's live reading with other available EVAP pressure data while the system is at rest and during the specified test.
- Inspect the B sensor's connector and wiring for loose terminals, corrosion, or damage that could distort the signal.
- Check the B sensor's pressure hose for restrictions, kinks, cracks, or disconnection.
- Run the manufacturer's EVAP pressure test and compare sensor B's response with the manufacturer's specification.
Common fixes
- Reconnect or replace a restricted or damaged pressure hose to sensor B.
- Clean and secure the sensor B connector.
- Repair wiring that causes an unstable or inaccurate signal.
- Replace pressure sensor or switch B if it drifts or fails the specified response test.
Can I keep driving?
The vehicle is generally driveable, but the EVAP fault can raise fuel-vapor emissions and lead to an inspection failure. If a strong fuel smell or visible leak is present, stop driving and address it promptly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.