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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0449 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

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
SCHEDULE P0449 DIAGNOSTIC Get a fair and transparent estimate upfront

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 1-800-701-6220.

trouble codes
P0449
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0449 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

P0130 OBD-II Trouble Code: 02 Sensor Circuit Malfunction (Bank I Sensor 1)
P0130 code definition The P0130 code is associated with the bank 1, sensor 1, oxygen sensor. Your vehicle may have anywhere up...
P2605 OBD-II Trouble Code: Intake Air Heater A Circuit
P2605 code means voltage variations have triggered the Check Engine Light due to open or shorted wires or connectors, or faulty heater element.
P0568 OBD-II Trouble Code: Cruise Control Set Signal Malfunction
P0568 P0568 code definition Cruise Control Set Signal Malfunction What the P0568 code means P0568 is an OBD-II generic code that the engine control module (ECM) or body control module (BCM) identified a voltage signal for more than 90 seconds...

Related questions

Engine vibration even in idle. Check Engine Light is not on.

You're correct, your engine uses a timing chain. It also has variable valve timing (VTT). This system allows the engine timing to change in relation to engine RPM. A VVT fault could cause driveabilty issues both at idle and at...

It dies at random times also the check engine light blinks at certain times and it stays on all the time

When the vehicle dies, you will need to see if you are losing spark or fuel, and scan the computer for possible codes relating to a sensor problem. The Check Engine Light blinks when an active fault is happening, and...

Engine light and limp-home light

Hello, and thank you for writing in. When the vehicle's check engine light and limp mode are both set off, there is a problem with the vehicle that needs to be addressed. You can easily clear the codes with a...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com