What does this code mean?
P0442 describes a small leak, P0455 a large leak and P0456 a very small leak. Check the correct fuel-cap seal where fitted, hoses, valves and the manufacturer's leak-test procedure. A loose cap is one possibility, not the only cause. Do not use compressed air or improvised flame tests around fuel vapour.
Sources and interpretation [1]
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0456EVAP System Small LeakP0456Evap System Small LeakP0456EVAP SYSTEM SMALL LEAKP0456Evap System Small Leak.** JC Vehicles 2.4L: ·View all · Manufacturer wording →
Manufacturer communications
10Original wording in English
CHRYSLER, DODGE
Reported code forms P0456
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ●…
CHRYSLER, DODGE, JEEP
Reported code forms P0456
Fuel Tank and Fuel Evap System Components 1) For JK MIL On ? P0441: Before replacing this part due to fault code P0441, check for restriction due to plastic over-flash in the Purge Hose Port of the Intake Manifold. If…
CHRYSLER, DODGE
Reported code forms P0456
Flash: Powertrain Diagnostic and System ImprovementsThis bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software. A small number of customers may experience the…
CHRYSLER, DODGE
Reported code forms P0456
"FLASH: POWERTRAIN DIAGNOSTIC AND SYSTEM IMPROVEMENTS THIS BULLETIN INVOLVES SELECTIVELY ERASING AND REPROGRAMMING THE POWERTRAIN CONTROL MODULE (PCM) WITH NEW SOFTWARE. SYMPTOM/CONDITION: A SMALL NUMBER OF CUSTOMERS…
CHRYSLER, DODGE
Reported code forms P0456
Flash: Powertrain Diagnostic and System Improvements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software. A small number of customers may experience a…
CHRYSLER, DODGE
Reported code forms P0456
Flash: Powertrain Diagnostic and System Improvements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software. A small number of customers may experience a…
Check vehicle applicability
13A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Historical vehicle association; OBD-II compatibility is not established by this record.
| Make | Model | Model year |
|---|---|---|
| Chrysler | TOWN AND COUNTRY | 2019 |
| Chrysler | TOWN AND COUNTRY | 2017 |
| Chrysler | TOWN AND COUNTRY | 2016 |
| Chrysler | TOWN AND COUNTRY | 2015 |
| Chrysler | TOWN AND COUNTRY | 2014 |
| Chrysler | TOWN AND COUNTRY | 2013 |
| Chrysler | TOWN AND COUNTRY | 2003 |
| Chrysler | TOWN AND COUNTRY | 2002 |
| Chrysler | TOWN AND COUNTRY | 2001 |
| Chrysler | TOWN AND COUNTRY | 2000 |
| Chrysler | TOWN AND COUNTRY | 1999 |
| Chrysler | TOWN AND COUNTRY | 1998 |
Historical records · 1 · Historical vehicle association; OBD-II compatibility is not established by this record.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Sources and interpretation
These explanations are editorial summaries of the linked manufacturer material. PDF page numbers count from the first file page. Original publications are in English; translations are reference aids. A cited edition is not a claim that it is the manufacturer's latest instruction.
- 2024–2025 MY OBD System Operation Summary for Gasoline Engines ↗
Ford Motor Company · PDF page(s) 13, 14 ·
Source check date · 2026-10-27
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.