P0455 on Jeep Grand Cherokee: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Jeep Grand Cherokee vehicles equipped with 3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP).
1. Symptoms of P0455 on Jeep Grand Cherokee
When the Engine Control Module (ECM/PCM) on your Jeep Grand Cherokee (3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP)) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Jeep Grand Cherokee
Historical warranty claims and technical repair bulletins for Jeep Grand Cherokee point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Jeep Grand Cherokee
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Jeep Grand Cherokee equipped with 3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP).
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Jeep Grand Cherokee equipped with 3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP).
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Jeep Grand Cherokee equipped with 3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP).
Check vent valve for road salt corrosion or spider nest clogs. on the Jeep Grand Cherokee equipped with 3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP).
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Jeep Grand Cherokee equipped with 3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP).
4. Jeep Grand Cherokee P0455 FAQs
What causes code P0455 to trigger on a Jeep Grand Cherokee?
On the Jeep Grand Cherokee (3.6L Pentastar V6 (293HP) / 5.7L HEMI V8 / 4xe PHEV (375HP)), 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 Grand Cherokee 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 under driver side dashboard above foot pedals before extended highway driving.
Where is the diagnostic port located on the Jeep Grand Cherokee?
The 16-pin OBD-II DLC connector on the Jeep Grand Cherokee is situated under driver side dashboard above foot pedals. It requires no special tools to plug in a standard scanner.
How much does it cost to fix P0455 on a Jeep Grand Cherokee?
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.