Question about 1999 Buick LeSabre

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Request to know the code for P 0440, which shown on scanner?

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Evap emmision malfunction

Posted on Mar 28, 2011

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Posted on Jan 02, 2017

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Error 55 on daikin ducyed system


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I have a 0440 and a 0456 code on the car and am


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P0440 code is EVAP control system problem.This has to do with emissions from the carbon can, fuel tank and general leaks that come from fuel evaporation. Anywhere gas fumes can escape the systerm. This code is very common and can be caused by a simple fuel cap being loose or leaking. Check the fuel cap and reset the coputer. If the SES light comes back on there could be a problem with some of the systerm controls. ie vent valve,purge valveand canister. And /or vac leaks.

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Code 0440 or P0440


p0440 is typically an evaporative emissions code. What that means is gas in your tank evaporates and there is a system (evap system) set in place to manage those evaporations. This system monitors gas tank pressures and releases pressure accordingly. By monitoring pressures it can sometimes be set by leaving the gas cap a little loose after filling up. So the first thing I would check is make sure your cap is tight and get that code cleared out somewhere like a local parts store for free and see if it comes back on.

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Code 0440 2004 sunfire


Hello tiasr06,

The problem is the purge solenoid or the purge vent. I would change both of them and your problem will go away. The purge solenoid is located near the power steering pump and the purge vent is under the car, in the back, behind the gas tank on the driver's side.

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1 Answer

Check engine light is on


P0159 is a 'request" code to check the Trasmisiom Control Module for another code for the TCM sensor codes. you may have to take it to a transmission shop.

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1 Answer

Code 0440


P0440 onepx.gif EVAP Control System Malfunction onepx.gif onepx.gif onepx.gif onepx.gif onepx.gif onepx.gif onepx.gif onepx.gif Possible Causes onepx.gif Setting Conditions onepx.gif onepx.gif onepx.gif onepx.gif
  • Charcoal canister is clogged, loaded with fuel or with moisture
  • Fuel filler cap missing, loose (not tightened) or the wrong part
  • Fuel tank over-fill check valve cracked or damaged
  • Fuel tank seal leaking, fuel tank cracked or damaged/leaking
  • Fuel vapor hoses/tubes blocked or restricted, or fuel vapor control valve tube or fuel vapor vent valve assembly blocked
  • Vacuum hose or tubing cracked, damaged or disconnected
  • Vapor Pressure sensor incorrectly installed
  • PCM has failed
onepx.gif Engine started cold (ECT sensor signal less 86�F), engine runtime over 20 minutes in closed loop, vehicle driven to a speed of 55-60 mph, and the PCM detected the fuel tank pressure indicated the same value as the atmospheric pressure in the EVAP Monitor test.
This code sets in 2 Trip(s).First I would try making sure the gas cap is tight. You need to give it 2 trips before it may reset. The other choice would be to replace it, Cheaper than spending money on a professional.

Jan 25, 2009 | 2002 Lexus IS 300

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Car codes


When you have P0440, P0441 and P0446, it is a very good bet that the fuel cap was loose, or the fuel cap rubber seal is compromised. You will get all three of those codes every time that the cap is loose. Always make sure that the fuel cap is as tight as you can get it after you refuel.

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2002 dodge intrepid 2.7L


Rather than electrical, have had any thought about a leaky head gasket or cracked head?

Sep 15, 2008 | 2002 Dodge Intrepid

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