Check engine light on for evap system - C1500 Chevrolet Cars & Trucks

What about it ?

You have check light

You know it is an Evap System Issue

Same as all vehicle faults,use the codes to diagnose
the system,find the problem & resolve it

code po440 refers to evaporative emission (EVAP) system--malfunction ===causes --hose connections --intake leak--EVAP canister purge valve
code p0441 refers to EVAP system--incorrect flow detected===causes---hose connections --intake leak--EVAP canister purge valve.
once you fix the fault use a scanner to reset the engine light.

Just replace the evap purge valve.

Your evap emission system is your pressurized fuel system. If you are getting a check engine light and the scan is throwing an evap code start by changing your fuel cap. It is the cheapest part of the system and quite common to fail. Unfortunately if you change your cap and erase your fault codes and the check engine light returns for evap system again, you will probably end up at the dealership to track down the leak.

DTC P0496 - EVAPORATIVE EMISSION (EVAP) SYSTEM FLOW DURING NON-PURGE

SYSTEM DESCRIPTION
This DTC tests for undesired intake manifold vacuum flow to the evaporative emission (EVAP) system. The control module seals the EVAP system by commanding the EVAP canister purge valve Closed and the EVAP canister vent valve Closed. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a predetermined value within a predetermined time, this DTC sets.

THIS CODE ID FOR A 3.6L engine

code p 0441 refers to evaporative emission (EVAP) system --incorrect flow detected ==== causes --- hose connection/s--- intake leak---EVAP canister purge valve replace the purge valve

16824/P0440/001088 - EVAP Emission Control Sys: Malfunction Possible Symptoms

• Malfunction Indicator Light (MIL) active

Possible Causes

• Evaporative Emission (EVAP) System leaking
• Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) faulty
• Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115) faulty

Possible Solutions

• Check Evaporative Emission (EVAP) System Sealing
• Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80)
• Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115)

Most likely it is a cracked or broken vacuum line in the evap system, or the evap solenoid is not working, once in a while it is the evap canister itself, but not very often. Also make sure the fuel cap is good and closed tightly and is the proper one for your vehicle. (a fuel cap that does not seal will cause an evap leak)

Check the vacuum lines and inspect them carefully.

This is a closed system and any vacuum leak that causes the evap system to loose vacuum, or not to hold a specified vacuum for a specified amount of time, will register as a data trouble code (DTC) and the malfunction indicator light (M.I.L.) (check engine light, or service engine soon light) will be turned on.

maybe a fuse is blown? did you have the mechanic check the fuses? or even check all your relays and wiring?

no
it is more likely that the problem is in the EVAP system
code p 0455 refers to evaporative emission(EVAP)system---large leak detected ====causes --hose connections ---intake leak---EVAP cannister---EVAP canister purge valve
I would suggest to you to tell the mechanic to replace the EVAP purge valve as the problem is more likely to be that than the fuel tank