P1486
EVAP Leak Monitor — Pinched Hose Found
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The P1486 code on Chrysler, Dodge, and Jeep vehicles means the EVAP system's leak detection pump has identified a pinched or blocked hose during its self-diagnostic test. The EVAP system captures fuel vapors from the gas tank and routes them through hoses to a charcoal canister, where they're stored until the engine can burn them. The leak detection pump periodically pressurizes this system to check for leaks and blockages — P1486 specifically indicates a blockage was found.
Chrysler vehicles are particularly prone to this code because the factory EVAP hoses are preformed with tight bends that develop stress cracks over time. The most common failure point is where the hoses connect to the charcoal canister, which is typically mounted to the frame rail under the left side of the vehicle. The hoses crack and split at the bends, allowing the system to lose pressure during testing. A visual inspection under the vehicle can often reveal the cracked hose.
This is not an urgent code and won't affect drivability, but it should be fixed because a compromised EVAP system releases fuel vapors into the atmosphere and will cause you to fail an emissions inspection. The repair is usually straightforward and inexpensive — replacement EVAP hoses are cheap, and the hardest part is getting under the vehicle to access them. While you're under there, check all the hose connections and the charcoal canister for damage. Avoid overfilling your gas tank, as liquid fuel can saturate the canister and cause additional EVAP codes.
Severity
Symptoms
- •Check engine light illuminated
- •Possible faint fuel odor near or under the vehicle
- •Fuel economy may be slightly reduced
- •May notice difficulty at the gas pump with the nozzle clicking off prematurely
- •No significant drivability issues
Likely Causes
Chrysler EVAP hoses are preformed with tight bends that become stress points over time. The hoses commonly split at bends, particularly near the charcoal canister under the vehicle. The system detects a blockage because the cracked hose cannot hold pressure.
EVAP lines routed under the vehicle can be kinked by road debris, improper jack placement, or lines that have fallen out of their retaining clips. A pinched line prevents the leak detection pump from properly pressurizing the system.
The leak detection pump seals and pressurizes the EVAP system during self-testing. If the pump's diaphragm or solenoid fails, it may incorrectly report a blockage condition even when the hoses are intact.
A charcoal canister that has absorbed liquid fuel (from overfilling the gas tank) or has become clogged with debris creates a flow restriction that mimics a pinched hose condition.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Inspect all EVAP hoses for cracks, splits, or kinks and replace as needed
- Check charcoal canister hose connections under the vehicle near the left frame rail
- Replace the leak detection pump if it fails functional testing
- Replace the charcoal canister if saturated or clogged