P0457 on Chrysler
Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
P0457 on Chrysler vehicles indicates evaporative emission system leak detected (fuel cap loose/off). Au7o has documented this code across 1 Chrysler model — most commonly on 300. This code means the engine computer detected a large leak in the sealed fuel-vapor (EVAP) system, most often traced to a loose, missing, or poorly sealing gas cap. The EVAP system is supposed to trap gasoline vapors and burn them in the engine instead of releasing them into the air; a big leak lets those vapors escape. It is an emissions-only fault that will not hurt the engine, though it triggers the check-engine light and can cause a faint fuel smell. Typical repair costs on Chrysler range from $40 to $476, depending on the specific model and root cause.
Common Causes of P0457
- •Loose, missing, or improperly tightened fuel cap
- •Worn or cracked fuel cap seal/gasket
- •Damaged fuel filler neck or sealing surface
- •Cracked or disconnected EVAP hose
- •Stuck-open purge or vent valve
- •Faulty fuel cap that won't hold pressure
- •Leaking charcoal canister
P0457 on Chrysler by Model
Chrysler 300(1 issue)
- EVAP Leak Detection (NVLD/ESIM) Failure Triggers P0455/P0456 — Often Misdiagnosed as a Bad Gas Cap2005-2023
The Chrysler 300 uses Chrysler's proprietary natural-vacuum leak detection hardware instead of a conventional pressure-based leak detection pump. On 2005-2006 cars this is the NVLD (Natural Vacuum Leak Detection) valve/solenoid; from 2007 onward it is the ESIM (Evaporative System Integrity Monitor), a small spring-and-diaphragm switch mounted on or next to the charcoal/vapor canister on the left underbody ahead of the fuel tank. Both work the same way: as the sealed EVAP system heats and cools, natural pressure/vacuum changes trip an internal switch the PCM reads to confirm the system is sealed. The diaphragm seal inside the NVLD/ESIM is a well-documented high-failure item — it stiffens, sticks, or loses its seal with age, so the PCM can no longer verify integrity and falsely reports a leak. The result is a check-engine light with P0456 (small leak, ~0.020 in.), P0455 (large leak), or P0457 (interpreted as loose/missing cap), even when the fuel system is actually sealed. Because the code wording points at the gas cap, this is very commonly misdiagnosed: owners and shops replace the cap (and often the purge valve and canister) repeatedly before discovering the NVLD/ESIM itself is the culprit. One 2012 300 SRT owner reported eight dealer visits — the ESIM and its seal replaced twice, plus a new filler neck, purge valve, and charcoal canister — before the leak code was resolved. The fault is an emissions/MIL issue only: it does not affect drivability or engine longevity, but it will fail an emissions/smog inspection and on some model years can disable remote start until cleared. A faint fuel-vapor smell is occasionally reported when an actual leak is present.
Looking for P0457 on a different make?
View P0457 across all makes →Frequently Asked Questions
What does P0457 mean on Chrysler?▼
P0457 stands for "Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)." This code means the engine computer detected a large leak in the sealed fuel-vapor (EVAP) system, most often traced to a loose, missing, or poorly sealing gas cap. The EVAP system is supposed to trap gasoline vapors and burn them in the engine instead of releasing them into the air; a big leak lets those vapors escape. It is an emissions-only fault that will not hurt the engine, though it triggers the check-engine light and can cause a faint fuel smell. On Chrysler specifically, this code is documented across 1 model.
What causes P0457 on Chrysler vehicles?▼
Common causes on Chrysler: Loose, missing, or improperly tightened fuel cap, Worn or cracked fuel cap seal/gasket, Damaged fuel filler neck or sealing surface, Cracked or disconnected EVAP hose, Stuck-open purge or vent valve. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0457 on a Chrysler?▼
Repair costs on Chrysler range from $40 to $476, depending on the specific model and root cause.
Which Chrysler models have P0457 documented?▼
Au7o has documented P0457 on 1 Chrysler model: 300.