Welcome to our latest episode where we’ll discuss an interesting issue that some of you might encounter with your 2012 Jeep Grand Cherokee. Today, I’ll be demonstrating a code for evap system small leak (P0456) and showing you how to diagnose and fix it.
First, let’s address the P0944 code, which indicates a transmission fluid leak leading to slipping. This is a separate diagnosis from the evap system issue. Now, focusing on the P0456 code, I’ve set up a smoke test to identify the source of the small leak in the evap system.
Using a smoke test machine, I connected it to the purge control valve from the engine, which is linked to the evap canister. After conducting the test, I found a pinhole leak in a hose connected under the car, towards the charcoal canister.
In many cases, the cause of the evap leak, whether small or large, is attributed to the ESIM (Evaporative System Integrity Module) near the spare tire under the fender. This component contains a float that can malfunction, leading to inaccurate leak measurements.
It’s essential to monitor and inspect the hoses in this year model Jeep Grand Cherokee, as they are prone to breaking and cracking, contributing to evap system issues. A smoke test machine is invaluable in confirming the diagnosis and repair of such problems.
Thank you for watching, and I hope this information helps you address any similar issues with your vehicle. Don’t forget to like, subscribe, and share this video with others who might find it useful. Until next time!
What is the code for the EVAP system small leak?
The code for the EVAP system small leak is P0456.
How can I diagnose the EVAP system small leak?
You can diagnose the EVAP system small leak using a smoke test machine. Connect the machine to the purge control valve from the engine and check the hoses for any leaks or pinholes.
What is a common cause of the EVAP system small leak?
A common cause of the EVAP system small leak is the ESIM (Evaporative System Integrity Module), which is located near the spare tire under the fender. The ESIM has a float inside that measures the leak, and if it malfunctions, it can cause the P0456 code to appear.
How can I confirm and repair the EVAP system small leak?
A smoke test machine can be used to confirm the EVAP system small leak and diagnose any issues. Regularly checking and monitoring the hoses of the EVAP system is also recommended to prevent leaks and cracks.