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Severity: MinorFord

P0456 on Ford 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 →

64Complaints mentioning the code
#1Rank among 15 brands
2.5%Share of Ford DTC complaints

In NHTSA owner complaints we analyzed for Ford, P0456 was mentioned 64 times.

Most mentioned models

Ford Focus Bev21
Ford Edge9
Ford Escape6
Ford Focus5
Ford Mustang5
Ford Fusion4

Model years mentioned

Model years mentioned – Ford P045610641061181210134143153167171418419
2006: 1 · 2010: 4 · 2011: 6 · 2012: 8 · 2013: 10 · 2014: 4 · 2015: 3 · 2016: 3 · 2017: 7 · 2018: 14 · 2019: 4

Components named in these complaints

  • Fuel/propulsion System (45)
  • Engine (26)
  • Fuel System (9)
  • Gasoline (9)
  • Power Train (9)

Reports with a crash: 1 · fire: 0 · injuries: 2

Often appears together with

P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low P0443 Powertrain The ECU detected an electrical fault in the purge solenoid circuit: open, shorted or a bad… Low P2196 Powertrain The front sensor on bank 1 keeps claiming rich, so the PCM strips out fuel the engine actually… Low P0452 Powertrain The tank pressure sensor signal is stuck near 0 volts, lower than the sensor can physically… Minor

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

FordEmission ControlsCheck engine light on P0456 · Jeep

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