P0449 OBD-II Trouble Code: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

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Cost of diagnosing the P0449 code

P0449 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
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P0449 code definition

P0449 is a general OBD2 diagnostic trouble code indicating an issue with the EVAP vent control circuit. This code may be seen with other EVAP system codes

What the P0449 code means

The P0449 DTC means that the evaporative emission control system vent valve or solenoid has a malfunction. The ECU detects this fault and causes the Check Engine Light to be illuminated on the dashboard.

What causes the P0449 code?

  • Short or open in the wiring harness
  • Electrical connection that is intermittent or of poor quality
  • Failed charcoal canister vent valve
  • Faulty ECU

What are the symptoms of the P0449 code?

  • Commonly there will be no felt symptoms while driving.
  • The Check Engine Light will be illuminated on the dash board.
  • The driver may notice a slight fuel odor coming from the vehicle.

How does a mechanic diagnose the P0449 code?

  • Uses a scan tool to check for any codes stored in the ECU including history or pending codes

  • Take note of the freeze frame data associated with the codes this is the conditions the vehicle was under when the malfunction set the Check Engine Light

  • Clears all of the codes

  • Takes the vehicle on a road test to confirm any symptoms that are present

  • Performs a visual inspection of the wiring harness and the vent valve looking for any damage

  • Uses an advanced scan tool to operate the EVAP functions and enables the vent valve to function, checking for proper operation

  • Checks for continuity between the vent wiring and ECU

  • Perform a test on the ECU

Common mistakes when diagnosing the P0449 code

Mistakes can be made with any code when steps are not followed or aren’t completed at all. All components must be tested for proper operation thoroughly before they are replaced otherwise perfectly working parts may be replaced unnecessarily.

How serious is the P0449 code?

P0449 is an emissions control code and will cause the vehicle to fail OBD2 based emissions. Other than failing the emissions the fuel odor may bother some drivers. This code should not prevent normal vehicle operation but should still be repaired ASAP.

What repairs can fix the P0449 code?

  • Repairing or replacing the wiring harness
  • Replacing the charcoal canister vent valve
  • Repairing faulty electrical connections
  • Replacing faulty ECU

Additional comments for consideration regarding the P0449 code

Advanced level scans are extremely helpful when diagnosing EVAP system codes. These scan tools allow technicians to use the vehicle's EVAP self test procedures and let the user command on and off EVAP valves and solenoids. WIthout an advanced level scan tool these procedures can not be performed and diagnosis becomes much more difficult.

Need help with a P0449 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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P0449
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Anthony

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Anthony
6 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Carmichael, California
Anthony was great! We are very happy that we chose to go with this company instead of the overpriced and slow service we get from the Jeep dealership. He was on time and did the job just as expected. He identified a couple of other things that need to be done before the problems get worse. We appreciate having a technician give us direct feedback regarding our vehicle, rather than a service advisor (salesperson) that we've had to deal with in the past at the dealership. We'll be booking the addtional services very soon and will definitely request Anthony again now that he is familiar with our vehicle!

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37 years of experience
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Michael
37 years of experience
Subaru Forester - Check Engine Light is on - Santa Fe Springs, California
Michael was punctual and courteous. He knows what he’s doing and I would absolutely recommend him to anyone.

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
BMW 740Li - Check Engine Light is on - Roseville, California
Very helpful in finding out the fault codes in my bmw 740 li. It was simple fix and that the two tube hose just had to be connected and my drive train malfunction went away. This saved me from having to go the an expensive dealership. Anthony has a good attitude about his work.

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19 years of experience
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Breck
19 years of experience
Ram 1500 - Check Engine Light is on - Houston, Texas
Breck did a great job working on my truck. Showed up on time, found any issues I had on my truck and explained everything to me so that I understood what was going on. Went above and beyond, definitely will book him for future appointments.


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