Question about 2005 Hummer H2

1 Answer

I'm getting a p003 engine code , what does this mean and how can I fix this

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Hummer Master
  • 5,332 Answers

OBDII trouble codes are the letter P followed by four digits. Are you sure it's P003?

I’m happy to assist further over the phone at

Posted on Dec 30, 2012

  • 3 more comments 
  • Harold Washington
    Harold Washington Dec 30, 2012

    my mistake it says P0303

  • Jeremy W.
    Jeremy W. Dec 30, 2012

    That would be a number 3 cylinder misfire. What engine do you have?

  • Harold Washington
    Harold Washington Dec 30, 2012

    its a vortec v8 6.0 liter

  • Jeremy W.
    Jeremy W. Dec 30, 2012

    Great! Cylinder number three should be the second one back on the passenger side. Each cylinder has a coil and a plug wire. You can start by checking for spark out of the plug wire. If there is no spark than a new coil and wire should fix the problem. You can also check the spark plug to see what condition it is in. Also look for carbon tracking on the plug. It will look like a black line on the white part of the plug. If nothing seems wrong with the before mentioned than try swapping the coil with another cylinder. If the misfire follows the coil than replace it. You can also do this with the plu and the wire. If there is no change with swapping than you may have an injector issue or possible a weak cylinder. A compression test will tell you if the cylinder is o.k. Hope that helps. Let me know what you figure out.

  • Harold Washington
    Harold Washington Dec 30, 2012

    thanks , I will give it a try



1 Suggested Answer

  • 2 Answers

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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Jeep wrangler 4.0L engine code p003 what does this mean?

There is no code P003. are you sure you didn't mean P0300.

Aug 15, 2013 | 2005 Hummer H2

1 Answer

My H2 Hummer had a computet code P003 misfire on cylinder 3.I switched the spark plug wires around now Im getting a computer code P001 multiple misfires

check engine control fuse and then switch the coil packs around again. Rescan, and see what you get. Then switch to different coils again and rescan.
Mine was a combination of a blown engine control fuse and one bad coil.
My friend had the same, but it was 2 bad plugs and one bad coil.

Jan 20, 2013 | 2005 Hummer H2

1 Answer

Alfa 156 2lt JTS fault codes P0120 & P0505 are they an easy fix?

p0120 means you have a throtle position sensor problem could get expesive if throtle body is bad p0505 is same problem it means throtle idle controle valve problem hmm short bad ecm or bad throtle body hope this helps

Nov 27, 2012 | Cars & Trucks

1 Answer

My Ford Taurus Failed the inspection, we have replaced 1 oxygen sensor, but the reading still failed. Went to the Autozone & & did a reading came up with two codes P0430 & P0125, is this to...

PO125 means the ECM sees the engine is too cold to go into closed loop and runs rich for too long.
PO430 means the ECM doesn't like what it sees coming out the exhaust.
I would check the thermostat and make sure the engine is getting up to 195-200 degrees after 5 or 10 min of drive time, and if it is then check the temp sensor for the ECM to make sure it is reading the engine temp correctly.
Fixing the code 125 should take care of the code 430.

Jun 24, 2012 | 2001 Ford Taurus

1 Answer

Honda accord euro 2004 will not accelerate

Engine speed increasing w/o acceleration suggests a problem w/ torque converter slipping or drive clutches slipping. I assume this is an automatic. Make sure you have adequate fluid in the transmission. I would also check for any OBD2 transmission codes that might be presented.

Code P0420 for catalyst system efficiency below threshold will not affect engine performance. It only means the catalytic converter is not performing as designed.

good luck

Parts Of BMW

Jun 12, 2012 | Honda Accord Cars & Trucks

1 Answer

P1529 code error on my 2001 hyundai elantra GLS

Check the level in the ******. Make sure that oil is there and topped up if necessary. It should be on the upper marks. Good luck.

Feb 24, 2012 | 2001 Hyundai Elantra

1 Answer

What does 'check' warning light on instrument panel mean on daewoo tacuma

no, it's not the transmission. No monitors for that. It sounds like your check engine light.
When your engine computer detects a problem with it's engine management controls, or when an emissions problem is detected, the computer will turn your check engine light and store a code or codes describing the problem.
Autozone will scan your codes for free. Then you'll know if the light means a major problem (fix right away) or a minor problem that needs attention. When it's fixed, the light will stay off.
You won't know what that light means until you get the codes read. Good luck.

Nov 08, 2011 | Cars & Trucks

2 Answers

Check engine light is on and the code is p1133 is this the o2 sensor and how much will his cost me? please help

lmost O2 sensors are less than $75, that code indicates a 'lazy' sensor that is not switching fast enough to satisfy the engine computer-means your engine is probably near 100,000 miles or is in need of routine service (plugs, throttle body cleaning, etc.)-it will run smoother and get better gas mileage if you replace this sensor (bank one, side one, the sensor on the same bank as the #1 cylinder, in front of the catalytic converter).

May 23, 2011 | Chevrolet Tahoe Cars & Trucks

1 Answer

Hi i have dodge neon 2004 the problem is apear check engie on and receive code p003 . tugging the car at any speed, i already replace spark plug but after 2 week start whit the same problem,

P0300 Random/Multiple Cylinder Misfire Detected this is the code your refering to what it means is it means your haveing a misfire in your fireing system it dosent mean that it has to be a plug could be a plug wire or a coil pack on the plug is causeing this or a faulty fuel injector replace your plug wires if it goes off if not test your injectors its in one of theses good luck

Dec 18, 2010 | 2003 Dodge Neon

1 Answer


po001 fuel volume regulator control ckt (open) po003 fuel volume regulator control ckt (low) po004fuel volume regulator control ckt (high) po006 fuel shutoff valve control ckt (low).

Apr 22, 2010 | 2003 Dodge Grand Caravan AWD

Not finding what you are looking for?
2005 Hummer H2 Logo

Related Topics:

437 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hummer Experts


Level 3 Expert

80339 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Brandon Johnson
Brandon Johnson

Level 2 Expert

251 Answers

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

Answer questions

Manuals & User Guides