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2003 Hummer H2. Can not turn tumbler to start vehicle Bad sensor???

2003 Hummer H2. Last yr my key would not come out of the ignition. the tumbler would not make the final click to remove the key. The tumbler was changed and it was fine for a yr or so. Now the key won't turn on. The key slides in and out of the cylinder, but won't turn. I wiggled the shifter and turned the steering wheel but no luck... it wouldn't turn. There has been a common issue for the past 2 yrs... sometimes when i turn the truck on, the radio and CD player don't work (no lights at all). I turn the truck off for a few minutes and retry and it works fine. This sounds like an ignition sensor to me but I need some more advice. lately the electronic driver seat won't adjust forward/backwards/ tilt/recline/up/down. However when I turn the vehicle on / off, the seat memory always works and restores it. so it isn't a seat motor issue. (I am not too worried about the seat adjustment but thought it might be some good data to help diagnose the problem). Yesterday when out of the blue and for no reason, the key turned and the vehicle started as if there was nothing wrong. It was raining here yesterday, could that be an issue? The local shop plugged in the diagnostic equipment and it said "ignition sensor".(I think it was code B1440 but not 100% sure) Is this an easy fix? do i need to bring it to the dealer or can my local mechanic fix it(i.e. does something have to be programmed)? does it sound like an ignition sensor that fails to see that the vehicle is in park (key would not turn off last yr) or the key is in the ignition (yesterday) and the sensor is not operating correctly (radio is not recognized)

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Posted on Jan 02, 2017


SOURCE: When my 2004 Lincoln Aviator

try the relays for it, they tend to tie several systems into one relay which could cause all those things to no longer work

Posted on Sep 10, 2008

  • 126 Answers

SOURCE: drivers side power seat and steering column don't work

i think the seat control unit controls both items. check the connections at this unit to see if they are still securely attached to the unit.

i didn't know your exact model as i could not find the 08 528i and didn't know if yours was LH or RH drive. take a look at the pic and look for box #1 under the seat.

Posted on Feb 23, 2009

  • 8 Answers

SOURCE: 2003 Trailblazer- no power after key stuck in ignition

Sounds like an antitheft problem I would start with the antitheft system. Usually when you only have one key all keys have to be programmed together even the original. When you have more than one it is easy to program additional keys.

Posted on Apr 11, 2009

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SOURCE: This morning when I attempted

Hello:Try this procedure: turn key on, turn to start, let key come back to on wait ten minutes, turn key off wait 10 seconds turn key back on wait 10 minutes. turn key off wait 10 seconds turn key back on wait 10 minutes turn key off wait 10 seconds NOW try and start. In addition you might try tapping on switch assembly while trying to start. There is not any way to disable passlock. You might try having the engine control system codes read

Posted on Feb 01, 2011

  • 141 Answers

SOURCE: 2003 Toyota Matrix won't start!!

ok i hope this helps u..the most simple thing to do is to have the battery checked for a shorted cell in it...even if it is a new battery they can still go bad...then have it checked for what is called a paracitic draw this is when something stays on all the time an willl cause the car not to start ...

Posted on Jul 15, 2011

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Hello Stacy, My name is Mike. I am thrilled that you choose me to help you with your problem. I am sorry, it took me a few hours to get back to you. I have been helping other customers. Here is where I am with this on your cranking and not starting issue. Oh, by the way great job on your part eliminating some of the other potential suspects.

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Pull the start/run relay out for a couple minutes, then put it back in and reset it might reset the passlock box and start right up.

Now, why did I say that? I believe your problem is with your Passlock indicator.( which has to do with your anti theft system)The way I just described is a 50/50 chance to have it work, but don't worry. I always have a plan B and C.

Here is some questions to your symptoms: Stay with me now, wait for it.

Perform the re-learning procedure

Turn ON the ignition, with the engine OFF.

Attempt to start the engine, then release the key to ON (vehicle will not start).

Observe the SECURITY light, after approximately 11 minutes the light will turn OFF.

Turn OFF the ignition, and wait 10 seconds.

Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes ( the vehicle

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to CRANK).

Important: The vehicle learns the relearns Sensor Data Code and/or password on the next ignition switch

transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

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Here is Plan C as promised, but I personally would not suggest, Even though GMC offers a bypass procedure.

Link for a Bypass Solution:

Plan D, would be have to check into possibility of bad ECM, but lets hope that is just a worst case scenario.

Thanks So Much,Mike. Please Keep Me Informed of progress.

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