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Severity: MinorJeep

P0456 on Jeep Vehicles: EVAP System Leak Detected (Very Small Leak)

The EVAP system has a tiny leak, about 0.020 inch — the hardest EVAP leak to find, and often intermittent. P0456 →

12Complaints mentioning the code
#2Rank among 15 brands
1.9%Share of Jeep DTC complaints

In NHTSA owner complaints we analyzed for Jeep, P0456 was mentioned 12 times.

Notes by brand

Many Jeep, Dodge and Chrysler models use an ESIM (Evaporative System Integrity Monitor) switch at the canister instead of a leak-check pump. A dirty or sticking ESIM can set small and very small leak codes even when the hoses are sealed.

Most mentioned models

Jeep Grand Cherokee4
Jeep Grand Cherokee Srt2
Jeep Grand Cherokee Trackhawk2
Jeep Liberty1
Jeep Patriot1
Jeep Renegade1

Model years mentioned

Model years mentioned – Jeep P0456107212214215317118119
2007: 1 · 2012: 2 · 2014: 2 · 2015: 2 · 2017: 3 · 2018: 1 · 2019: 1

Components named in these complaints

  • Fuel/propulsion System (8)
  • Engine (7)
  • Unknown Or Other (2)
  • Electrical System (2)
  • Vehicle Speed Control (1)

Often appears together with

P0128 Powertrain The engine takes too long to warm up, which almost always points to a thermostat stuck open. Low P0172 Powertrain The engine computer is pulling as much fuel as it's allowed on bank 1 and the mixture is still… Moderate P0302 Powertrain Cylinder 2 keeps misfiring. On inline engines it's a middle cylinder, so rule out coolant… Moderate P0306 Powertrain Cylinder 6 is misfiring. On an inline-six it's the hot rear cylinder; on GM and Hemi V8s it can… Moderate P0406 Powertrain The EGR feedback sensor is reporting close to 5 volts or more, above anything a working sensor… Low P0455 Powertrain The fuel vapor system can't hold vacuum at all — check the gas cap first, then hoses and valves. Low

Possible causes

  1. Gas cap seal slightly worn, or cap not fully seated25%
  2. Purge valve not sealing completely when closed20%
  3. Hairline crack or loose clamp at an EVAP hose or quick-connector18%
  4. Vent valve, leak-check pump or leak-detection switch not sealing15%

P0456: Diagnosis step by step →

Related codes

JeepEmission ControlsCheck engine light on P0456 · Ford

Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.