Question about 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

02 chevy 2500hd 6.0 ses light flashing at40mph an gose out at 75mph

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    Uploaded 5 video answers.

  • Expert
  • 141 Answers

The SES light flashing means the engine management software has detected a misfire condition resulting in exceeding 3 times the federal limit of emissions. Under heavy load such as acceleration one or more cylinders are misfiring and once cruising speed is reached the engine is under a lighter load (10 to 20 percent ) that is why it stops flashing several causes of misfires are worn spark plugs ,spark plug wires, faulty ignition coil or coils fuel injector or fuel pressure problems a quick check of the computer to retrieve trouble codes should identify the problem cylinder or cylinders and will direct you in the right direction to find the faulty component but will not tell you exactly what is wrong certain test must be performed to isolate the cause.

Posted on Dec 05, 2012

  • 1 more comment 
  • chris everett Dec 05, 2012

    its is a p0300 code

  • Brian Johnson Dec 05, 2012

    to diagnosis a 300 series code check compression on each cylinder, check for good spark ,good spark plug,good spark plug wire ,good injector electrically and mechanically check for injector pulse and check for power and grounds to the coils and injectors

  • chris everett Dec 05, 2012

    will do thanks



3 Suggested Answers

  • 2 Answers

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

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.

Posted on Jan 02, 2017

  • 104 Answers

SOURCE: I have a 2003 Chevy Silverado 2500HD. When I

heated seat eliment needs replaced. or unplog

Posted on Apr 01, 2010

  • 501 Answers

SOURCE: 2005 chevy silverado v8, some hesitation, rough

Black smoke could mean it is running rich, have a scan done, it is probably an engine misfire code and it will tell you which cylinder is misfiring. the last digit is the cylinder, unless it says random missfire, It may be time for a good tune up and don't forget the fuel injection system, Clean out the intake and do an induction cleaning on the injectors.

Posted on Aug 16, 2009

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

What is the code p0087 in my 2007 chevy duramax

SES suction supply vacuum. GM BULLETIN #PIP4526. It's a vacuum hose that is getting hot under load and loosing its rigidity and collapsing. You gm dealer should be able to supply you with and updated hose. Ask them to print out the service bulletin to walk you through the repair.

Dec 07, 2013 | 2007 Chevrolet Silverado 2500HD

1 Answer

2002 chevy 2500hd6.0 ses light flashes at 40 mph an gose out at 75mph p0300 new plugs an wires

they are known for the 02 sensors going bad. you will need to have the computer scanned to see for sure.

Dec 05, 2012 | 2002 Chevrolet Silverado 2500HD

1 Answer

Why does my 02 deville get real hot when I'm goin 75mph an up

Check the air flow for any blockage or desviation because on hwy speeds.the car donot need use the fans like in the strets.

Sep 17, 2012 | 2002 Cadillac Deville

1 Answer

I have a 2003 Chevy Silverado 2500HD. When I

heated seat eliment needs replaced. or unplog

Apr 01, 2010 | 2005 Chevrolet Silverado

2 Answers

Have 2001 chevy 2500hd with a code 0700 bad tcm. can you tell me where it is and how much do they run.

P0700=Transmission Control System (MIL Request)
Does not mean bad TCM,=transmission control modual,
all that happen here was the computer did not like the responce it got from a sensor,and requested the check engine light be turned on.
You need to have it scanned by a shop if it reappears

Dec 25, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer


2001 chevy silverado 2500hd battery light flashes intermittently. no problem with battery or alterntor. both tested ok. no problems with starting or running. voltage gauge reads just above 14. no problems with anything except battery light flashes. what could be the problem?

Dec 04, 2009 | 2001 Chevrolet Silverado 2500HD

2 Answers

2003 chevy suburban has a flashing check engine

could be anything from the weird to the sublime so i couldnt evan hope to tell you unless i had the vehicle in front of me sorry

Nov 25, 2009 | 2003 Chevrolet Suburban 1500

1 Answer


160 MPa at idle and it reaches at least 158 MPa 
Good luck but i think there was a recall on the fuel system on your year and make of truck.
#04-06-04-007I: Service Engine Soon (SES) Light On, DTCs P0087, P0093, P1093, Low Power, No Start, Hard Start, Fuel in Crankcase (Replace All Injectors - New Strategy for High Fuel Return Rates) - (Aug 18, 2008)

Apr 07, 2009 | 2002 GMC Sierra 2500HD

2 Answers


ses might stand for service engine soon, did you replace the batterie? or a shop did it for you ? if it was a shop take it back to them and let them know what's happening but if you did it it has to be diagnose with the famous scan tool to se what information the computer has stored, you know like codes

Jun 21, 2008 | 2004 Nissan 350Z

Not finding what you are looking for?
Cars & Trucks Logo

146 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

76132 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

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

Answer questions

Manuals & User Guides