Question about 2003 GMC Sierra

1 Answer

Service engine lite keeps coming on , i have had the code check on it and am told fuel evap is the prob and try a new gas cap but i am wondering if anything else could be up ? (2003 sierra z71 4x4)

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 22,114 Answers

Check the pipes for perished or split on the pipes back to the tank

Posted on Aug 21, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Po455


Check all hoses and fittings from evap back to fuel tank. On 1post in pacifica world the prob was solved by dropping the fuel tank and replacing the fitting on one of the fuel pumps. Then clear the code and hopefully doesn't come back.

Sep 08, 2014 | 2005 Chrysler Pacifica

1 Answer

Why check engine light and code P0540 Large Evap Leak


did you reset codes after every repair ? is it a newer car ? there is a sensor in canister called a netural pressure vapor sensor they tend to leak or stick .causing evap codes , I chased the same code ,it would go out for about a week then come back in my case it was the new gas cap it was the wrong one for my car. it keeped building pressure in gas tank . and could hear it hissss when I would open it fuel up .

Aug 28, 2014 | Cars & Trucks

2 Answers

Replaced gas cap engine light came back on


most fuel systems are not vented if cap has vent that could be your prob or you have a prob with your evap system front or rear sencer could be bad or your evap canister could have mosture in it you need to have a systems check to find out what code has been thrown weather it's electrical or emmissions

Mar 25, 2012 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

I have 2000 Montana. Service Eng light on, a check says: P0440 -- evaporated emission cntrl system small leak/low flow condition. Explanation: defective or loose fuel cap, evvap canister or hose cracked-...


P0440 small evap leak, If it was purge at fault the PCM would give you a purge failure code, If it was that vacuum leak you are hearing you would of have lean bank code, anything with the evap in the engine compartment is purge,the back where the fuel tank is or the canister is evap. so you have evap problem,slow leak a broken hose would be gross leak detected. as for electrical it would be solenoid evap.fix the gas cap. 3_17_2012_9_11_41_pm.jpg

Mar 17, 2012 | 2000 Pontiac Montana

2 Answers

Engine code po455


Check this info about P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms: You likely won't notice any drivability problems.

Causes: A code p0455 most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions: With a p0455, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary


Check it and keep us updated.

Apr 22, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

2 Answers

Service engine Diagnosis Code PO455 Transmission revs up


Hi, the code indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system


With a p0455, the most common repair is to:

  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

Mar 05, 2011 | 1999 Ford Taurus

2 Answers

CHECK GAS CAP / ENGINE SERVICE ARE ON


Most likely an evap system fault code stored in engine computer. Best bet and cheapest thing is go to the dealer and buy a new cap. Install the cap and drive the car for a few days if the light goes off, your all set, if not you need to check for codes. Then probably find a leak or a faulty evap vent valve or purge valve.

Oct 07, 2010 | 2001 Pontiac Bonneville

3 Answers

The check engine light keeps coming on -we were told it was because gas cap was loose-but she filled up & tightened the cap-but still on


First, you need to go to a local parts store and find out what the code means. If it shows a small leak, the gas cap probably needs replaced. Gas caps need replaced more often now that computers register fuel emissions.

Jul 01, 2009 | 2006 Suzuki Grand Vitara

2 Answers

Check engine light keeps coming on replaced gas cap already


Your problem is in the evaporative emission system which is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. The light coming on can be caused by one of the following:

1. Defective or loose fuel cap
2. EVAP canister or hose cracked- not connected
3. Purge or vent solenoid defective
4. Vacuum leak at engine Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. You have tried the easy fix, the gas cap. Finding the leak now will require special equipment and testing procedures, might be better left to a professional.

Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

Mar 18, 2009 | 2003 Dodge Caravan

Not finding what you are looking for?
2003 GMC Sierra Logo

Related Topics:

122 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75797 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...