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P0455

Jeep Wrangler GuideLow Severity

P0455 on Jeep Wrangler: Symptoms, Causes & DIY Fix

Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Jeep Wrangler vehicles equipped with 3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP).

DIY Parts Estimate

$15 - $250 (DIY: $15 - $50)

Wrangler Direct Fit

Shop Labor Quote

$180 – $380

Based on $125/hr labor

Drivability Status

Drivable (Short Trip)

Low urgency level

Est. DIY Time

45 – 90 Min

Basic hand tools

Check P0455 On Another Jeep Model:

Jeep Grand Cherokee Jeep Wrangler

1. Symptoms of P0455 on Jeep Wrangler

When the Engine Control Module (ECM/PCM) on your Jeep Wrangler (3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP)) logs fault code P0455, drivers commonly observe:

Check Engine Light on on Jeep Wrangler (3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP))

Gas cap loose warning message on dashboard on Jeep Wrangler (3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP))

Slight fuel vapor odor near rear of vehicle on Jeep Wrangler (3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP))

Jeep Wrangler OBD-II Port Location

The 16-pin diagnostic connector is located Below steering wheel near driver left knee. Plug in your scan tool to verify freeze-frame sensor values.

2. Most Likely Causes on Jeep Wrangler

Historical warranty claims and technical repair bulletins for Jeep Wrangler point to the following failure distribution:

55%

Missing, loose, or cracked gas cap seal (Jeep OEM Part)

25%

Faulty EVAP purge control solenoid (Jeep OEM Part)

12%

Stuck open EVAP vent valve (Jeep OEM Part)

Cracked EVAP charcoal canister vapor hose (Jeep OEM Part)

3. Step-by-Step DIY Repair Guide for Jeep Wrangler

Inspect and Tighten the Gas Cap

Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Jeep Wrangler equipped with 3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP).

Required Tool: None

Replace Gas Cap with OEM Replacement

If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Jeep Wrangler equipped with 3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP).

Required Tool: New OEM Gas Cap

Test EVAP Purge Solenoid Under Hood

Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Jeep Wrangler equipped with 3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP).

Required Tool: 12V Probe, Vacuum Pump

Inspect EVAP Canister Vent Valve Near Gas Tank

Check vent valve for road salt corrosion or spider nest clogs. on the Jeep Wrangler equipped with 3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP).

Required Tool: Flashlight, Jack Stands

Smoke Test EVAP System

Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Jeep Wrangler equipped with 3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP).

Required Tool: EVAP Smoke Machine

4. Jeep Wrangler P0455 FAQs

What causes code P0455 to trigger on a Jeep Wrangler?

On the Jeep Wrangler (3.6L Pentastar V6 / 2.0L Turbo 4-Cyl / 4xe Hybrid (375HP) / 6.4L 392 HEMI (470HP)), P0455 is most frequently caused by Missing, loose, or cracked gas cap seal or Faulty EVAP purge control solenoid. Factory sensor degradation or wiring harness wear near the engine bay are common factors.

Can I safely drive my Jeep Wrangler with code P0455?

Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on Jeep vehicles, we advise performing diagnostic scanning via the OBD-II port located below steering wheel near driver left knee before extended highway driving.

Where is the diagnostic port located on the Jeep Wrangler?

The 16-pin OBD-II DLC connector on the Jeep Wrangler is situated below steering wheel near driver left knee. It requires no special tools to plug in a standard scanner.

How much does it cost to fix P0455 on a Jeep Wrangler?

DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized Jeep dealership, expect an additional $120–$250 in professional labor based on their $125/hr hourly rate.