Toyota Fault Code

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P0455 / P0456

Fuel smell near rear; CEL after refueling.

System

Emissions

Symptom

Fuel smell near rear; CEL after refueling.

Diagnosis & fix steps

EVAP System Leak (Large/Small). LOGIC: The vacuum test fails to hold pressure in the fuel tank/charcoal canister. ACTION: Smoke test the EVAP lines and check the fuel cap seal. FIX: Replace Fuel Cap or Charcoal Canister.

Red Seal field insights

In the GCC, high heat causes the rubber seals on gas caps and EVAP hoses to crack prematurely. Always start with a new OEM gas cap.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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