P0496 EVAP Flow During Non-Purge Condition
OBD-II Trouble Code Technical Description
EVAP (evaporative emission) Flow During A Non-Purge Condition
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
A quick search on the 'net shows that this code seems to be more common with GM (Chevy, Pontiac, etc.) vehicles. In Acura, Honda, Hyundai, Kia, and Mazda vehicles, this code is described "EVAP system high purge flow" which is the same thing.
This DTC checks for undesired intake vacuum flow to the EVAP system. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. 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 code is set and the MIL (malfunction indicator lamp) is illuminated.
Symptoms of a P0496 DTC will include Malfunction Indicator Lamp (MIL) illumination, and most likely no other noticeable symptoms. Some may experience a hard start / crank condition. In some cases the engine may run rich which may not detected, but can cause damage long-term (think: catalytic converter damage).
Potential causes of a P0496 EVAP code include:
- Faulty purge or vent solenod/valve
- Plugged EVAP canister
- Failed EVAP / fuel pressure sensor
- Poor electrical connection
- Short electrical circuit condition (Hyundai, Isuzu)
- Faulty canister purge valve
- Blocked vapor canister
- Faulty vent solenoid
- Leaking EVAP system hose (Hyundai)
- Faulty purge flow sensor (Kia, Mazda)
The most common fix for this DTC is to replace the purge solenoid valve. However, be sure to do a proper diagnosis before replacing parts!
Ideally you would use an advanced scan tool, with the ignition on and engine off, you seal the EVAP system using the Seal/Purge function. Then, watch the fuel tank pressure sensor reading when you turn the purge off. If the pressure value is higher than the normal range set by the manufacturer, replace the EVAP canister purge solenoid valve. Refer to a model-specific repair guide for the proper specification.
If you don't have access to the scan tool, you could always disconnect the vacuum line at the purge valve going back to the charcoal canister. Unplug the electrical connector on the purge valve, start the engine, then put your finger on the valve where you disconnected the line. If you can feel vacuum there, the purge solenoid valve is faulty and needs to be replaced. Alternately, you could simply remove the purge solenoid valve and blow into it. It is normally closed, so if air goes through then you need to replace it.
If the purge valve checks out good, either the problem with the valve is intermittent or there is a problem with the fuel tank pressure sensor. To test the fuel tank pressure sensor you will need to have a high end scan tool to monitor the tank pressure with the gas cap removed. If the sensor shows vacuum with the gas cap removed, there is a problem with the fuel tank pressure sensor.
Here is a picture of one purge solenoid valve. Yours may look similar or different, consult a factory service guide or your local vehicle dealership for more details:
Related P0496 DTC Discussions
- P0496 on 08 Saturn Vue Xr 3.6L
Hello I have a Saturn Vue Xr 3.6 L I am getting engine code P0496 I have checked and replaced my vet solenoid I also did the test where I disconnect the power connector and a vacuum line there was no suction meaning the solenoid is good but I am still getting the P0496 era code I was told that the f...
- 08 PONTIAC G6 READING P0171 AND P0496
OK, THIS IS ACTUALLY MY FRIEND'S CAR, BUT SHE'S GETTING NOWHERE WITH MULTIPLE MECHANICS AND THEIR SCAN TOOLS. THERE'S A LITTLE HESITATION AT AROUND 15 MPH WHILE ACCELERATING, AND IT SOMETIMES STALLS WHEN TURNING OR SITTING AT A LIGHT. IT DOESN'T USUALLY SPUTTER WHEN IT STALLS, IT JUST DIES. SO FAR, ...
- 2007 Cadillac STS P0496
My engine light came on with a code P0496 which is EVAP can anyone tell me where this is located on the engine and do I need to replace it. Thanks...
- 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132
2009 Hyundai Accent GS - 110,000 mi - 5spd manual Have had codes p0451 and p0496 for the past 10k miles, have replaced gas cap with OEM and FTPS and PCSV and CCV. Codes always come back after DTC clear. I have checked all rubber lines and they are all 100% intact as I have replaced them all. Today...
- 2005 Saturn L300 P0446 & P0496
We bought out teenage son a 2005 Saturn L300 and have been working on check engine light issues. The first time we got these codes we had our mechanic look at it and they replaced the Vent Solenoid. The next time it was the Purge Solenoid but the GM part is discontinued. We found a part on rockau...
- 2011 chevy cruze code P0496
The solution to this seems to be to replace the purge solenoid valve. I have a 2011 chevy cruze. Where is this valve located and does anyone have a diagram?...
- P0496 code 2005 Chevy trailblazer
ok so my light came on...0496 was determined, replaced purge valve. turned light out...after a while came back on, replaced gas cap, same thing, vent valve, same thing, map sensor, same thing, fuel pressure sensor, same thing... smoke tested..passed... now I drive it for a while and the light turned...
- 2008 saturn vue 3.6L p0014 p0496 p0174
Was driving home from a job when the car started running rough (out of time). My scanner came up with P0014 P0496 P0174. Thought maybe the first code affecting the other two and replaced the Bank 1 intake and exhaust cam position actuators. Upon start up, car ran great. When the car was driven a...
- P0175/P0172/P0496 -- 2008 LTZ Chevy Suburban 4WD, FLEX- 5.3
2008 LTZ Chevy Suburban 4WD, FLEX- 5.3 I use top tier detergent (supreme). About a month ago my check engine light came on and it spit out codes P0175/P0172, so I go and change the Purge Solenoid, I believe it was Bank 1, the easier one to get to. Scanner is still spitting out P0175/P0172. I then ch...
- p0496 problem 2007 kia rio
I have a kia rio 2007 and the code p0496 was on so i changed the purge valve solenoid but the code keep coming up wath should i do next ?...
Need more help with a p0496 code?
If you still need help regarding the P0496 trouble code, please post your question in our FREE car repair forums.
NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected.