Question about 2004 Hummer H1

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Transmission won't shift out of 1st.? H1 93 hummer Driving down the interstate at 65 mph water pump broke leaked and overheated and suddenly seemed like it was shifted into neutral (still in D though). Pulled over and put into park, Then back into D but it would mainly stay in 1st. Took to a shop replaced the waterpump won't shift out of 1st. . Took the truck to the mechanic he hooked up the snap-on computer but it did not read . I was told the computer set it self to safemode "" so i dont drive the car while pump is broken. (please help if you know how i can reset the trucks computer without the snap-on computer or factory scanner how can i reset it manualy) Already Tried: fixed the whaterpump. hooked up the snap on computer but it did't read. disconnected the battery for 5 days. used harsh profanity to convince it to work.

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Posted on Jan 02, 2017

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SOURCE: 2004 Hummer H2 leaking water on passenger floor

never worked on a hummer but rule of the day is that there always is a drain on the firewall on the engine side. usually a small rubber hose about two inches long direced downward. Usually you can stick your finger in there and clear it out. Don't shove anything hard into it or you can punch a hole in the evaporator core.

Posted on Apr 05, 2009

  • 201 Answers

SOURCE: replacing rear brakes on a hummer h1 2000

ase labor chart shows 3.6 hours normal time for these repairs. avg actual time is 3.5 to 4 hrs and this includes pressure bleeding system.

Posted on May 09, 2009

  • 78 Answers


well what could of happend they probably put the battery on backwards and blew out a fusible link.The links run thru the wires by the battery and behind the alternator check it out Good Luck keep me posted

Posted on May 27, 2009

  • 315 Answers

SOURCE: Hummer H2 2003, shifting problem

Yea, hummers are notoriously unreliable. They are gas gusslers too.
I'm assuming this is an automatic?
When the transmissions computer detects any malfunctions, it will give you a check engine light, or something along those lines.
Do the normal checks such as checking the transmission fluid level as per the user manual.

For further diagnostics you'll need to take it to a mechanic. It's impossible to diagnose a problem like this without driving the car and being able to reproduce the problem.

Posted on Aug 09, 2009

  • 1 Answer

SOURCE: key will not turn to off and battery dies after several minutes

chances are it is your tumbler or parking gear switch. you can replace the tumbler (ignition switch) or the parking gear switch is not recognizing that the vehicle is in park and preventing the key from being turned off

Posted on Aug 18, 2009

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