Question about 2003 Hummer H2

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2003 Hummer H2 overheats while idling in Park

Have a 2003 Hummer H2 that is overheating while in Park. Engine light comes on & stays on. Not sure what is causing the problem.

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NED TO HAVE THE CODES FOT THE CHECK ENGINE LIGHT READ.THE CODE WIL LEAD U IN THE CORRECT DIRECTION.GET BACK TO ME W/THE CODE.

Posted on May 13, 2009

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Battery light stays on after key is removed on hummer h2


Check the battery has good charge, should be over 12v with engine off and 13-15v when running.
If it's not holding a charge correctly it will cause light to come on as low power.
There may be something shorted too, keep your eye on power levels with a tester....when you switch off, check....then check again next day "before" you start engine. Look for drop below 12v.

Oct 12, 2016 | 2004 Hummer H2

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Why is the service 4WD message on all the time and diff lock light flashes and dos not lock?


Hummer 4wd service light reset Questions & Answers - Fixya

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Electrical problems on 2003 H2 Hummer


there is many contacts in the ignition switch sounds like the switch is bad

Jun 27, 2012 | 2003 Hummer H2

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Am looking for a repair maual for a 2003 Hummer H2 that has an electrical diagram in it?


Go to faxonautoliterature. They carry the original dealer service manual for your Hummer. It will havwe wiring diagrams in it. I have used them before and had excellent service. Hope this helps.

Nov 29, 2009 | 2003 Hummer H2

2 Answers

My 2003 h2 died this morning while driving. All


disconnect harness to the pump and jump with test light, turn key on and the light should go on for a few seconds

Nov 28, 2009 | 2003 Hummer H2

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MY 2004 H2 Hummer is in park... I can start it but no matter what I do I cant get it out of park??? any Idea's


Do your brake lights work? It might be the brake switch or the shift interlock solenoid.

Jun 08, 2009 | 2003 Hummer H2

1 Answer

Hummer H2 engine won't turn over, key won't


Dead Battery? Bad starter motor?

Try pushing on the brake and making sure its all the way in park.

Turn the steering wheel back an forth a little to remove the key.

None of those work, Call triple A, find a shop.

Jun 07, 2009 | 2007 Hummer H2 SUT

1 Answer

Shifter is stuck in park


The shift cable is off the lever on the trans...the dash indicator states drive but the shifter is in park. Look under the drivers side of the trans, next to the catalytic converter(make sure the truck is cooled off) the trans cable will not be attached to the tranny lever-re-attach and you will be able to get it home or to a shop for a repair. This happened to me already, simple fix.

Rob Davis
2003 H2

Mar 11, 2009 | 2003 Hummer H2

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