Q: 2006 Pontiac GTO - Trouble codes P0300 and P0496. Feels like misfire and/or out of fuel

asked by on

Initially I saw a trouble code of P0496 with no noticeable symptoms then it went away. A week later it started acting like it was running out of gas and sounds like a random misfire. After a couple of days of that I now have both P0496 and P0300. What should I tackle first?

My car has 102500 miles.
My car has a manual transmission.

Hi There, Code P0496 relates to the EVAP system, specifically indicating that the system has detected more flow than normal during a non-purge condition. This means that the system may be trying to purge excess pressure or fumes form the fuel tank when it is not necessary to do so. This is typically a sign of a faulty vent valve solenoid or sticking purge valve. As a result, this can inadvertently cause the motor to run rich at times, although it may not be noticeable. This can cause the misfire code of P0300 to also be triggered, causing a running out of gas like symptom as you have described. Although the motor may be running rich, it may cause a running out of fuel like reaction due to the fact that the motor is unable to efficiently burn the fuel being supplied to it. I would suggest checking the vent valve and solenoid to be sure this is operating correctly as this is likely the cause of the codes you have provided.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 2006 Pontiac GTO - Trouble codes P0300 and P0496. Feels like misfire and/or out of fuel

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My brake light & traction light on dash stays on.

Hi There, This may suggest that your brake pads are worn and due to be replaced or that you have a leak somewhere in your brake hydraulic system. The brake reservoir has a sensor inside that detects when the brake...

Q: Throttle is not responsive - 2003 GMC Yukon

Hi there. From the description your vehicle only shakes in first gear, with delayed upshift seems unusual. Assuming the P0300 code is continuing to return, it leads me to believe you may have a fuel delivery issue. Low fuel pressure...

Q: Car battery is fully charged and the car is receiving no power, it wont start and none of the in or outside lights are working.

Hello there, problems starting are one of the most common issues with your 2000 Pontiac Bonneville. The first place to start when the vehicle will not start properly is to have the battery load tested, this is a test checks...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...