What is the EVAP code on a Jeep Wrangler?
I’ve had EVAP (Evaporative Emission System) leak error codes (P0455, P0456, P0457 or the GAS CAP message) multiple times over the past couple of years that finally annoyed me enough that I decided to launch a quest to fix it. That quest started with a trip to the service department but ended in me taking charge of finding the solution myself.
What is the trouble code on a Jeep Wrangler?
Jeep Wrangler P0456: EVAP System – Small Leak. One of the most common trouble codes with the Jeep Wrangler is the P0456 code. This trouble code references a number that is given to you when you plug your Wrangler into a OBDII scanner.
How does the leak detection system on a jeep EVAP work?
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.
When does a Jeep Wrangler have a leak?
When there is a small leak in the Jeep Wrangler’s EVAP system, it will throw the P0456 OBDII Code. If there is a large leak, it’ll throw P0455.
I’ve had EVAP (Evaporative Emission System) leak error codes (P0455, P0456, P0457 or the GAS CAP message) multiple times over the past couple of years that finally annoyed me enough that I decided to launch a quest to fix it. That quest started with a trip to the service department but ended in me taking charge of finding the solution myself.
Jeep Wrangler P0456: EVAP System – Small Leak. One of the most common trouble codes with the Jeep Wrangler is the P0456 code. This trouble code references a number that is given to you when you plug your Wrangler into a OBDII scanner.
When there is a small leak in the Jeep Wrangler’s EVAP system, it will throw the P0456 OBDII Code. If there is a large leak, it’ll throw P0455.
What causes the p0440 code on a Jeep Wrangler?
There are many things that can cause the P0440 trouble code to trigger in your Jeep Wrangler. Here are the most common problems that will throw the code: Evap System Hose – The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This will cause the P0440 code.