What it means
A general circuit fault on the LDP internal pressure sensor. 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
The evaporative emission system stores fuel vapor and uses a leak detection pump to check whether the vapor system is sealed. A pressure sensor in the pump reports pressure to the control module, and this code sets when the sensor circuit has a general electrical fault such as an open or short.
Common causes
Most likely first.
- Open or short in pressure sensor wiring
- Faulty leak detection pump pressure sensor
- Loose or corroded connector
- Fault in the leak detection pump
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
- Record freeze-frame data and check for other evaporative system codes that may help distinguish a pressure sensor circuit fault from a leak.
- Inspect the leak detection pump pressure sensor connector and wiring for corrosion, loose pins, damage, or a short to power or ground.
- Check the pressure-sensing hose for disconnection, cracks, blockage, or a poor seal.
- Use scan-tool data to observe the pressure sensor signal during the manufacturer's specified pump test, if supported.
- Test the sensor circuit and leak detection pump using the manufacturer's wiring diagram and diagnostic procedure.
Common fixes
- Reconnect a loose pressure-sensing hose or electrical connector.
- Repair damaged wiring or corroded connector terminals.
- Replace a leaking or restricted pressure-sensing hose.
- Replace the pump pressure sensor or leak detection pump if testing confirms the failed component.
Can I keep driving?
Normal driving is usually possible, but avoid ignoring a fuel-vapor smell and keep ignition sources away from any suspected leak. The fault can prevent evaporative leak monitoring and cause an emissions inspection failure.
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.