P0455
Missing fuel cap, Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve and or Evaporative Purge Valve, Defective or damaged fuel tank, Defective Fuel Tank Pressure Sensor
Causes
- Missing or loose fuel filler cap
- Defective or damaged fuel cap seal
- Distorted or damaged fuel tank filler neck
- Torn, cracked or disconnected EVAP hoses or fittings
- Defective fuel tank sending unit gasket or seal
- Split or damaged carbon (charcoal) canister
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Strong fuel odor around the vehicle or fuel filler area
- Failed EVAP readiness or failed emissions test
- No drivability symptoms in many cases (engine may run normally)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect fuel cap for damage and confirm it is tightened/latches correctly
- Inspect filler neck, tank area and EVAP hoses for cracks, disconnections or obvious damage
- Check for fuel smell near filler, canister and hoses
- Use a smoke machine or EVAP leak tester to locate a large leak quickly
- Monitor EVAP-related live data (fuel tank pressure, purge/vent valve status) with a scan tool
Signal parameters
- Fuel Tank Pressure / EVAP Pressure PID (kPa or inches H2O) — should hold pressure; large drop indicates gross leak
- Fuel Tank Pressure Sensor voltage (typical reference ~0.1–4.9 V depending on pressure) — compare to expected at key reference points
- Purge valve commanded state and actual response (ON/OFF or duty cycle)
- Vent valve/vent solenoid commanded state and actual response (should close to allow pressurization during test)
- EVAP system leak test result (smoke flow or pressure decay rate)
Diagnostic algorithm
- Confirm P0455 is current and note freeze frame/other EVAP codes
- Visually inspect and tighten the fuel cap; replace cap and clear codes if cap damaged or missing — re-test readiness and monitor for return
- Perform a visual inspection of the filler neck, tank area, EVAP hoses, clamps and connections for cracks, splits, or disconnections
- Use a calibrated smoke machine to pressurize the EVAP system and observe for escaping smoke at hoses, fittings, filler neck, canister and tank seams
- With a scan tool, command the vent and purge valves and verify they respond; inspect for a valve stuck open that prevents system sealing
- Monitor fuel tank pressure PID during a pressure or vacuum test; confirm the system holds pressure for the expected time
- If smoke/visual tests point to a component (hose, canister, valve, tank seam), replace the failed part and re-test the system
- If no physical leak is found, test/replace the fuel tank pressure sensor and check wiring/connectors; then clear codes and perform drive cycle to verify repair
- After repair, clear codes and perform drive cycle or readiness tests; re-scan to ensure P0455 does not return
Likely causes
- Loose or missing fuel cap (first and easiest to check)
- Cracked or disconnected EVAP hose or fitting
- Failed vent or purge valve (stuck open)
- Damaged carbon canister or tank leak
- Faulty fuel tank pressure sensor or its wiring harness
Fault status
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HTML ManualP0455
Large EVAP Leak
Causes
- Missing or loose fuel filler cap
- Defective or damaged fuel cap seal
- Distorted or damaged fuel tank filler neck
- Torn, cracked or disconnected EVAP hoses or fittings
- Defective fuel tank sending unit gasket or seal
- Split or damaged carbon (charcoal) canister
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Strong fuel odor around the vehicle or fuel filler area
- Failed EVAP readiness or failed emissions test
- No drivability symptoms in many cases (engine may run normally)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect fuel cap for damage and confirm it is tightened/latches correctly
- Inspect filler neck, tank area and EVAP hoses for cracks, disconnections or obvious damage
- Check for fuel smell near filler, canister and hoses
- Use a smoke machine or EVAP leak tester to locate a large leak quickly
- Monitor EVAP-related live data (fuel tank pressure, purge/vent valve status) with a scan tool
Signal parameters
- Fuel Tank Pressure / EVAP Pressure PID (kPa or inches H2O) — should hold pressure; large drop indicates gross leak
- Fuel Tank Pressure Sensor voltage (typical reference ~0.1–4.9 V depending on pressure) — compare to expected at key reference points
- Purge valve commanded state and actual response (ON/OFF or duty cycle)
- Vent valve/vent solenoid commanded state and actual response (should close to allow pressurization during test)
- EVAP system leak test result (smoke flow or pressure decay rate)
Diagnostic algorithm
- Confirm P0455 is current and note freeze frame/other EVAP codes
- Visually inspect and tighten the fuel cap; replace cap and clear codes if cap damaged or missing — re-test readiness and monitor for return
- Perform a visual inspection of the filler neck, tank area, EVAP hoses, clamps and connections for cracks, splits, or disconnections
- Use a calibrated smoke machine to pressurize the EVAP system and observe for escaping smoke at hoses, fittings, filler neck, canister and tank seams
- With a scan tool, command the vent and purge valves and verify they respond; inspect for a valve stuck open that prevents system sealing
- Monitor fuel tank pressure PID during a pressure or vacuum test; confirm the system holds pressure for the expected time
- If smoke/visual tests point to a component (hose, canister, valve, tank seam), replace the failed part and re-test the system
- If no physical leak is found, test/replace the fuel tank pressure sensor and check wiring/connectors; then clear codes and perform drive cycle to verify repair
- After repair, clear codes and perform drive cycle or readiness tests; re-scan to ensure P0455 does not return
Likely causes
- Loose or missing fuel cap (first and easiest to check)
- Cracked or disconnected EVAP hose or fitting
- Failed vent or purge valve (stuck open)
- Damaged carbon canister or tank leak
- Faulty fuel tank pressure sensor or its wiring harness
Fault status
Similar codes
P0455
EVAP System Leak Detected - Large Leak
Causes
- Missing or loose fuel filler cap
- Defective or damaged fuel cap seal
- Distorted or damaged fuel tank filler neck
- Torn, cracked or disconnected EVAP hoses or fittings
- Defective fuel tank sending unit gasket or seal
- Split or damaged carbon (charcoal) canister
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Strong fuel odor around the vehicle or fuel filler area
- Failed EVAP readiness or failed emissions test
- No drivability symptoms in many cases (engine may run normally)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect fuel cap for damage and confirm it is tightened/latches correctly
- Inspect filler neck, tank area and EVAP hoses for cracks, disconnections or obvious damage
- Check for fuel smell near filler, canister and hoses
- Use a smoke machine or EVAP leak tester to locate a large leak quickly
- Monitor EVAP-related live data (fuel tank pressure, purge/vent valve status) with a scan tool
Signal parameters
- Fuel Tank Pressure / EVAP Pressure PID (kPa or inches H2O) — should hold pressure; large drop indicates gross leak
- Fuel Tank Pressure Sensor voltage (typical reference ~0.1–4.9 V depending on pressure) — compare to expected at key reference points
- Purge valve commanded state and actual response (ON/OFF or duty cycle)
- Vent valve/vent solenoid commanded state and actual response (should close to allow pressurization during test)
- EVAP system leak test result (smoke flow or pressure decay rate)
Diagnostic algorithm
- Confirm P0455 is current and note freeze frame/other EVAP codes
- Visually inspect and tighten the fuel cap; replace cap and clear codes if cap damaged or missing — re-test readiness and monitor for return
- Perform a visual inspection of the filler neck, tank area, EVAP hoses, clamps and connections for cracks, splits, or disconnections
- Use a calibrated smoke machine to pressurize the EVAP system and observe for escaping smoke at hoses, fittings, filler neck, canister and tank seams
- With a scan tool, command the vent and purge valves and verify they respond; inspect for a valve stuck open that prevents system sealing
- Monitor fuel tank pressure PID during a pressure or vacuum test; confirm the system holds pressure for the expected time
- If smoke/visual tests point to a component (hose, canister, valve, tank seam), replace the failed part and re-test the system
- If no physical leak is found, test/replace the fuel tank pressure sensor and check wiring/connectors; then clear codes and perform drive cycle to verify repair
- After repair, clear codes and perform drive cycle or readiness tests; re-scan to ensure P0455 does not return
Likely causes
- Loose or missing fuel cap (first and easiest to check)
- Cracked or disconnected EVAP hose or fitting
- Failed vent or purge valve (stuck open)
- Damaged carbon canister or tank leak
- Faulty fuel tank pressure sensor or its wiring harness
Fault status
Similar codes
P0455
- Significant leakage in the control system for the removal of fumes of fuel
Causes
- Missing or loose fuel filler cap
- Defective or damaged fuel cap seal
- Distorted or damaged fuel tank filler neck
- Torn, cracked or disconnected EVAP hoses or fittings
- Defective fuel tank sending unit gasket or seal
- Split or damaged carbon (charcoal) canister
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Strong fuel odor around the vehicle or fuel filler area
- Failed EVAP readiness or failed emissions test
- No drivability symptoms in many cases (engine may run normally)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect fuel cap for damage and confirm it is tightened/latches correctly
- Inspect filler neck, tank area and EVAP hoses for cracks, disconnections or obvious damage
- Check for fuel smell near filler, canister and hoses
- Use a smoke machine or EVAP leak tester to locate a large leak quickly
- Monitor EVAP-related live data (fuel tank pressure, purge/vent valve status) with a scan tool
Signal parameters
- Fuel Tank Pressure / EVAP Pressure PID (kPa or inches H2O) — should hold pressure; large drop indicates gross leak
- Fuel Tank Pressure Sensor voltage (typical reference ~0.1–4.9 V depending on pressure) — compare to expected at key reference points
- Purge valve commanded state and actual response (ON/OFF or duty cycle)
- Vent valve/vent solenoid commanded state and actual response (should close to allow pressurization during test)
- EVAP system leak test result (smoke flow or pressure decay rate)
Diagnostic algorithm
- Confirm P0455 is current and note freeze frame/other EVAP codes
- Visually inspect and tighten the fuel cap; replace cap and clear codes if cap damaged or missing — re-test readiness and monitor for return
- Perform a visual inspection of the filler neck, tank area, EVAP hoses, clamps and connections for cracks, splits, or disconnections
- Use a calibrated smoke machine to pressurize the EVAP system and observe for escaping smoke at hoses, fittings, filler neck, canister and tank seams
- With a scan tool, command the vent and purge valves and verify they respond; inspect for a valve stuck open that prevents system sealing
- Monitor fuel tank pressure PID during a pressure or vacuum test; confirm the system holds pressure for the expected time
- If smoke/visual tests point to a component (hose, canister, valve, tank seam), replace the failed part and re-test the system
- If no physical leak is found, test/replace the fuel tank pressure sensor and check wiring/connectors; then clear codes and perform drive cycle to verify repair
- After repair, clear codes and perform drive cycle or readiness tests; re-scan to ensure P0455 does not return
Likely causes
- Loose or missing fuel cap (first and easiest to check)
- Cracked or disconnected EVAP hose or fitting
- Failed vent or purge valve (stuck open)
- Damaged carbon canister or tank leak
- Faulty fuel tank pressure sensor or its wiring harness
Fault status
Similar codes
P0455
Evaporative Emission (EVAP) System Leak Detected
Causes
- Missing or loose fuel filler cap
- Defective or damaged fuel cap seal
- Distorted or damaged fuel tank filler neck
- Torn, cracked or disconnected EVAP hoses or fittings
- Defective fuel tank sending unit gasket or seal
- Split or damaged carbon (charcoal) canister
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Strong fuel odor around the vehicle or fuel filler area
- Failed EVAP readiness or failed emissions test
- No drivability symptoms in many cases (engine may run normally)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect fuel cap for damage and confirm it is tightened/latches correctly
- Inspect filler neck, tank area and EVAP hoses for cracks, disconnections or obvious damage
- Check for fuel smell near filler, canister and hoses
- Use a smoke machine or EVAP leak tester to locate a large leak quickly
- Monitor EVAP-related live data (fuel tank pressure, purge/vent valve status) with a scan tool
Signal parameters
- Fuel Tank Pressure / EVAP Pressure PID (kPa or inches H2O) — should hold pressure; large drop indicates gross leak
- Fuel Tank Pressure Sensor voltage (typical reference ~0.1–4.9 V depending on pressure) — compare to expected at key reference points
- Purge valve commanded state and actual response (ON/OFF or duty cycle)
- Vent valve/vent solenoid commanded state and actual response (should close to allow pressurization during test)
- EVAP system leak test result (smoke flow or pressure decay rate)
Diagnostic algorithm
- Confirm P0455 is current and note freeze frame/other EVAP codes
- Visually inspect and tighten the fuel cap; replace cap and clear codes if cap damaged or missing — re-test readiness and monitor for return
- Perform a visual inspection of the filler neck, tank area, EVAP hoses, clamps and connections for cracks, splits, or disconnections
- Use a calibrated smoke machine to pressurize the EVAP system and observe for escaping smoke at hoses, fittings, filler neck, canister and tank seams
- With a scan tool, command the vent and purge valves and verify they respond; inspect for a valve stuck open that prevents system sealing
- Monitor fuel tank pressure PID during a pressure or vacuum test; confirm the system holds pressure for the expected time
- If smoke/visual tests point to a component (hose, canister, valve, tank seam), replace the failed part and re-test the system
- If no physical leak is found, test/replace the fuel tank pressure sensor and check wiring/connectors; then clear codes and perform drive cycle to verify repair
- After repair, clear codes and perform drive cycle or readiness tests; re-scan to ensure P0455 does not return
Likely causes
- Loose or missing fuel cap (first and easiest to check)
- Cracked or disconnected EVAP hose or fitting
- Failed vent or purge valve (stuck open)
- Damaged carbon canister or tank leak
- Faulty fuel tank pressure sensor or its wiring harness
Fault status
Similar codes
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HTML ManualP0455
Leak in the system of evaporative control detected (gross leakage)
Causes
- Missing or loose fuel filler cap
- Defective or damaged fuel cap seal
- Distorted or damaged fuel tank filler neck
- Torn, cracked or disconnected EVAP hoses or fittings
- Defective fuel tank sending unit gasket or seal
- Split or damaged carbon (charcoal) canister
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Strong fuel odor around the vehicle or fuel filler area
- Failed EVAP readiness or failed emissions test
- No drivability symptoms in many cases (engine may run normally)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect fuel cap for damage and confirm it is tightened/latches correctly
- Inspect filler neck, tank area and EVAP hoses for cracks, disconnections or obvious damage
- Check for fuel smell near filler, canister and hoses
- Use a smoke machine or EVAP leak tester to locate a large leak quickly
- Monitor EVAP-related live data (fuel tank pressure, purge/vent valve status) with a scan tool
Signal parameters
- Fuel Tank Pressure / EVAP Pressure PID (kPa or inches H2O) — should hold pressure; large drop indicates gross leak
- Fuel Tank Pressure Sensor voltage (typical reference ~0.1–4.9 V depending on pressure) — compare to expected at key reference points
- Purge valve commanded state and actual response (ON/OFF or duty cycle)
- Vent valve/vent solenoid commanded state and actual response (should close to allow pressurization during test)
- EVAP system leak test result (smoke flow or pressure decay rate)
Diagnostic algorithm
- Confirm P0455 is current and note freeze frame/other EVAP codes
- Visually inspect and tighten the fuel cap; replace cap and clear codes if cap damaged or missing — re-test readiness and monitor for return
- Perform a visual inspection of the filler neck, tank area, EVAP hoses, clamps and connections for cracks, splits, or disconnections
- Use a calibrated smoke machine to pressurize the EVAP system and observe for escaping smoke at hoses, fittings, filler neck, canister and tank seams
- With a scan tool, command the vent and purge valves and verify they respond; inspect for a valve stuck open that prevents system sealing
- Monitor fuel tank pressure PID during a pressure or vacuum test; confirm the system holds pressure for the expected time
- If smoke/visual tests point to a component (hose, canister, valve, tank seam), replace the failed part and re-test the system
- If no physical leak is found, test/replace the fuel tank pressure sensor and check wiring/connectors; then clear codes and perform drive cycle to verify repair
- After repair, clear codes and perform drive cycle or readiness tests; re-scan to ensure P0455 does not return
Likely causes
- Loose or missing fuel cap (first and easiest to check)
- Cracked or disconnected EVAP hose or fitting
- Failed vent or purge valve (stuck open)
- Damaged carbon canister or tank leak
- Faulty fuel tank pressure sensor or its wiring harness
Fault status
Similar codes
P0455
EVAP.emission(gross leak)
Causes
- Missing or loose fuel filler cap
- Defective or damaged fuel cap seal
- Distorted or damaged fuel tank filler neck
- Torn, cracked or disconnected EVAP hoses or fittings
- Defective fuel tank sending unit gasket or seal
- Split or damaged carbon (charcoal) canister
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Strong fuel odor around the vehicle or fuel filler area
- Failed EVAP readiness or failed emissions test
- No drivability symptoms in many cases (engine may run normally)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect fuel cap for damage and confirm it is tightened/latches correctly
- Inspect filler neck, tank area and EVAP hoses for cracks, disconnections or obvious damage
- Check for fuel smell near filler, canister and hoses
- Use a smoke machine or EVAP leak tester to locate a large leak quickly
- Monitor EVAP-related live data (fuel tank pressure, purge/vent valve status) with a scan tool
Signal parameters
- Fuel Tank Pressure / EVAP Pressure PID (kPa or inches H2O) — should hold pressure; large drop indicates gross leak
- Fuel Tank Pressure Sensor voltage (typical reference ~0.1–4.9 V depending on pressure) — compare to expected at key reference points
- Purge valve commanded state and actual response (ON/OFF or duty cycle)
- Vent valve/vent solenoid commanded state and actual response (should close to allow pressurization during test)
- EVAP system leak test result (smoke flow or pressure decay rate)
Diagnostic algorithm
- Confirm P0455 is current and note freeze frame/other EVAP codes
- Visually inspect and tighten the fuel cap; replace cap and clear codes if cap damaged or missing — re-test readiness and monitor for return
- Perform a visual inspection of the filler neck, tank area, EVAP hoses, clamps and connections for cracks, splits, or disconnections
- Use a calibrated smoke machine to pressurize the EVAP system and observe for escaping smoke at hoses, fittings, filler neck, canister and tank seams
- With a scan tool, command the vent and purge valves and verify they respond; inspect for a valve stuck open that prevents system sealing
- Monitor fuel tank pressure PID during a pressure or vacuum test; confirm the system holds pressure for the expected time
- If smoke/visual tests point to a component (hose, canister, valve, tank seam), replace the failed part and re-test the system
- If no physical leak is found, test/replace the fuel tank pressure sensor and check wiring/connectors; then clear codes and perform drive cycle to verify repair
- After repair, clear codes and perform drive cycle or readiness tests; re-scan to ensure P0455 does not return
Likely causes
- Loose or missing fuel cap (first and easiest to check)
- Cracked or disconnected EVAP hose or fitting
- Failed vent or purge valve (stuck open)
- Damaged carbon canister or tank leak
- Faulty fuel tank pressure sensor or its wiring harness
