Engine-Codes.com | All About OBDII Engine Codes
Engine-Codes.com | All About OBDII Engine Codes

P0456 Jeep

P0456 Jeep - EVAP System Small Leak

PDF
P0456 Jeep Comments |  Add Comment
Possible causes
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Evaporative Emission (EVAP) canister or fuel tank leaks
- Evaporative Emission (EVAP) system hose leaking
- Fuel tank leaking
Help with Possible causes What does this mean?
When is the code detected?
Malfunction is detected when EVAP control system has detected a very small leak.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0456 Jeep Description

The Evaporative emissions system is design to prevent the escape of fuel vapors from the fuel system. Leaks in the system, ca allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage.

During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.

Need more help?
Do you need more help with the P0456 Jeep code? ask a question to our users or search the top hand picked automotive forums for more information


(You will add more details to the question in the next step)
or
JEEP Technical Service Bulletins for P0456 code
2002 JEEP GRAND CHEROKEE Engine And Engine Cooling:exhaust System:emission Control Details
1997 JEEP WRANGLER Engine And Engine Cooling:engine Details
1998 JEEP WRANGLER Engine And Engine Cooling:engine Details
1999 JEEP WRANGLER Engine And Engine Cooling:engine Details
2000 JEEP WRANGLER Engine And Engine Cooling:engine Details
More Bulletins Help with Technical Service Bulletins What does this mean?
Need parts?
Need parts to fix this code? Search hundreds of stores at the same time and compare prices


Help Engine-Codes.com
Help us improve Engine-Codes.com. Leave a comment below or tell us if the information above help you fix the code. What are symptoms is your vehicle for the P0456 Jeep code? Have you replaced any parts?
Any information is appreciated. Thanks
Engine-Codes.com Comments Powered by Disqus
Google +
Engine Light ON?

The Engine-Codes.com ELM327 WiFi Car Diagnostic connects to your Android phone, iPhone, iPad, or Windows computer from your vehicle.
Ask OBDII Question