What it means
The control module detects a leak in the alternative-fuel high-pressure system. This code concerns alternative-fuel equipment; it is not a brake-hydraulic fault.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
An alternative-fuel high-pressure system carries fuel through lines, valves, and seals at elevated pressure. The control module monitors this system and sets P240E when it detects a leak on the high-pressure side. This code concerns alternative-fuel equipment, not a brake-hydraulic fault.
Common causes
Most likely first.
- Leaking hose or fitting
- Leaking cylinder valve or seal
- Damaged high-pressure line or connection
Symptoms
- Check engine light on
How to diagnose it
- Review freeze-frame data and available high-pressure system readings without operating or loosening any pressurized connection.
- Check from a safe distance for fuel odor or visible leakage around the high-pressure lines, cylinder valve, and accessible connections.
- Do not touch or disturb suspected high-pressure leaks; follow the manufacturer's shutdown and isolation instructions for the fuel type.
- Have the high-pressure system inspected and leak-tested using the manufacturer's procedure and appropriate equipment.
- After the leak is repaired by the specified method, verify system integrity and confirm the code does not return.
Common fixes
- Replace a damaged high-pressure line using the manufacturer's procedure.
- Replace a leaking cylinder valve or seal as specified for the system.
- Repair or replace a leaking high-pressure fitting or connection.
- Replace a cracked or damaged high-pressure component.
Can I keep driving?
Do not drive if a high-pressure fuel leak is suspected, or if you smell or see fuel; stop safely and follow the vehicle's fuel-system emergency instructions. High-pressure leaks can be hazardous and may worsen, so the system needs inspection before the vehicle is used again.
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.