The evaporative emission (EVAP) system on a 2015 Jeep is part of the vehicle’s fuel-and-emissions hardware. In most 2015 Jeep models, the main EVAP canister sits near the fuel tank under the rear of the vehicle, while the purge valve is installed in the engine compartment and connected to the intake manifold by vacuum lines.
Exact placement can vary by model and trim (for example Wrangler JK, Cherokee KL, and Grand Cherokee WK2.) The general pattern, however, is a charcoal canister near the fuel tank for vapor storage, plus purge and vent valves in or near the engine bay to control vapor flow into the engine.
Overview of EVAP components and general layout
The following components are the core parts of the EVAP system you’ll commonly find on a 2015 Jeep. This list helps you identify what to look for during inspection or when diagnosing codes.
- Charcoal canister: stores fuel vapors until they’re drawn into the engine for combustion.
- Purge valve (solenoid): opens to allow vapors to be pulled from the canister into the intake manifold.
- Vent valve/vent solenoid: controls venting of vapors to atmosphere or back into the canister (depending on the system).
- Gas cap and filler neck sensors: monitor the integrity of the gas cap seal; a faulty cap can trigger EVAP-related codes.
- Fuel tank pressure sensor (in some configurations): monitors pressure changes in the tank to detect leaks.
Knowing these components helps you understand what you’re inspecting and how the system operates during normal operation and diagnostic testing.
How to locate the EVAP components on your 2015 Jeep model
Because the exact layout varies by model, use these general guidance steps to locate the EVAP parts on your vehicle. This approach applies across many 2015 Jeep variants, with model-specific deviations possible.
- Inspect the undercarriage near the fuel tank for a small plastic or metal canister (the charcoal canister).
- Look in the engine bay for the purge valve mounted on or near the intake manifold or throttle body, with vacuum hoses running to the canister.
- Check around the rear wheel wells or along the rear frame rails for the canister housing in Wrangler/Grand Cherokee varieties.
- Examine the filler neck and gas cap area for seals, adapters, and sensors that could trigger EVAP codes.
By locating the canister and purge/vent valves, you can perform basic checks for leaks, replace faulty components, or perform a diagnostic smoke test if codes indicate EVAP problems.
2015 Jeep Wrangler (JK)
In the Wrangler JK, the charcoal canister is typically mounted under the rear of the vehicle along the frame rail near the fuel tank or behind the rear bumper area. The purge valve is usually located in the engine bay, on the firewall side near the throttle body, with vacuum lines running to the canister.
2015 Jeep Cherokee (KL)
For the Cherokee KL, the EVAP canister is generally found along the underbody near the fuel tank, on one side of the vehicle. The purge valve resides in the engine compartment and connects to the intake manifold via a vacuum hose.
2015 Jeep Grand Cherokee (WK2)
The Grand Cherokee WK2 typically places the charcoal canister on the undercarriage near the fuel tank, often toward one side of the rear area. The purge/vent valves are located in the engine bay, with lines running to the intake manifold and/or the canister.
What to do if you’re diagnosing or replacing EVAP components
These steps can help you diagnose EVAP issues or prepare for replacement. Always ensure the vehicle is safely parked and cool before working on fuel-system components.
- Check for EVAP-related trouble codes with an appropriate scan tool (common codes include P0440–P0444, P0446, etc.).
- Visually inspect the charcoal canister and hoses for cracks, disconnections, or signs of leaks.
- Test the purge and vent valves for proper operation; listen for valve clicking and check for vacuum when commanded (using a vacuum pump or scan tool).
- Inspect the gas cap seal and filler neck for damage or a loose cap, which is a frequent source of EVAP codes.
- Consider a smoke test to identify vacuum leaks in hoses, connections, or the canister if codes point to a leak.
After diagnostics or replacement, clear codes and perform a road test to confirm the EVAP system is functioning correctly and that the warning light does not return.
Summary
On a 2015 Jeep, the EVAP system centers on a charcoal canister located near the fuel tank under the rear of the vehicle and purge/vent valves in the engine bay connected to the intake. Exact placement varies by model (Wrangler, Cherokee, Grand Cherokee), so consult your vehicle’s manual or a service manual for precise coordinates. A careful visual inspection of the canister area, hoses, and the purge/vent valves—along with gas-cap checks—covers the most common EVAP diagnostic checks.