Code P0449 question

2004 Elantra.

Had it in to the dealer several times for a "Check Engine Light". They said it's a P0449 code.

History follows:

05/24/05 - Performed a Service Engine Scan. Found one history code leading to Evap system. Cleared and tested. Customer to monitor

05/27/05 - Failure Code P0449 Cause: Fuel tube hose was split allowing water into the purge cannister and cannister filter Correction: Replace hose and drain water from the cannister filter

06/01/05 - Cause: Diagnostic Code P0449 Vent Valve circuit cannister close valve innop. Correction: Replaced valve

Since that time, the Check Engine Light has been on and off quite a few times. The car is running fine, but I worry that the light being on renders it useless, as it could mask other problems that might show up. This whole thing started not too long after the car was rear-ended and repaired.

Any ideas?

Thanks, Larry (lar3ry at sasktel dot net)

Larry

Reply to
Oleg Lego
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First, you should probably find out what code is present now. That'll tell us whether we're still combatting the same issue or something different.

Presuming you have the P0449 again, the evap. system needs to be checked for fuel intrusion. Liquid fuel in the evap system can cause vacuum to not vent properly.

The fuel tank pressure sensor should be checked for proper operation.

The plumbing for the evap system should be checked for proper routing and connection and condition(possibly collision related).

If you had water in the canister filter or canister itself, it's possible one or both of these components was damaged, especially the charcoal canister. Liquid in charcoal canister requires it to be replaced.

Reply to
hyundaitech

It seems rather stupid on the part of the dealer to scan and obtain a code and take no diagnostic action other than to 'clear the code' and send you on your way, which is precisely what they did on your first visit.

And, to add to that, P0449 is a 'generic' obd-ii code that says the failure is in the evap system vent solenoid. What did the dealer do on trip number 2? They replaced a bad hose. They still(apparently) did not check the electrical circuit or the physical function of the vent solenoid.

On trip 3, they replaced the valve, something that should have been inspected and tested on visit number 1.

If the engine light is on now, run the car down to checker/autozone/kragen, etc. and have them pull all of the diagnostic codes out for you(they will perform this service for free), and post your findings here.

There are four types of OBD-II codes, if they begin with a P it is a powertrain code. If the first digit is a zero, P0xxx then it is a 'generic' OBD-II code that is common to all OBD-II equipped vehicles. If the first digit is a 1, P1xxx, then it is a manufactureri-specific diagnostic code. You will need access to hyundai service literature to know what a P1xxx code means. However, you can read all about the 'generic' codes here

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Let us know what you find out.

Chris

Reply to
halatos2000

The hyundaitech entity posted thusly:

Well, I had the car in for a Service 4 yesterday, and passed on your suggestions as well as those Chris mentioned.

The following is from the bill:

Complaint: Customer states that the engine check light is on Check history codes Cause: Scanned and inspected Found 2 codes dealing with the evap emissions p0449 and P0445 Inspected and diagnosed that the evap cannister close valve not functioning as designed Correction: Removed and replaced purge cannister close valve assembly and cleared codes. Road tested for operation Found light did not return Problem corrected

I left the dealership, and stopped at a few places in town. While on the way home, the light came back on.

Reply to
Oleg Lego

Sent this a while back, but it looks like it didn't get there...

The hyundaitech entity posted thusly:

Well, I had the car in for a Service 4 yesterday, and passed on your suggestions as well as those Chris mentioned.

The following is from the bill:

Complaint: Customer states that the engine check light is on Check history codes Cause: Scanned and inspected Found 2 codes dealing with the evap emissions p0449 and P0445 Inspected and diagnosed that the evap cannister close valve not functioning as designed Correction: Removed and replaced purge cannister close valve assembly and cleared codes. Road tested for operation Found light did not return Problem corrected

I left the dealership, and stopped at a few places in town. While on the way home, the light came back on.

Reply to
Oleg Lego

That can be a hard one to truly clear up. I had to go back 4 times to get it finished... the last time I was given a loaner car for 3 days. they claimed it ended up being a pin hole leak in the canister system. as Its the Sulev engine

Reply to
Andy C

The Andy C entity posted thusly:

Reply to
Oleg Lego

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