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2003 CL55 key will not turn in ignition

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Old Oct 19, 2011 | 09:32 PM
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2003 cl55 amg
2003 CL55 key will not turn in ignition

2003 mercedes cl55 amg key will not turn in ignition.
Problem started last week, i could not get key to turn in ignition first thing in the morning, however later on in the afternoon the car started. I thought it was a battery issue so i got the battery replaced. When i replaced the battery the key would still not turn in ignition. I then noticed that the clock and gear display on right side of dash was blank.
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Old Oct 20, 2011 | 03:27 PM
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2003 cl55 amg
I replaced the car battery, and i got a replacement key made.....the key still does not lock or unlock vehicle, i used blade to open door and i placed key in ignition but was still unable to turn key in ignition. PLEASE ADVISE
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Old Oct 20, 2011 | 10:20 PM
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Do your brake lights work? Sometimes issues with the brake switch will make it hard to insert or remove the key. Just a thought.
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Old Oct 21, 2011 | 08:52 AM
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2003 cl55 amg
It is weird because the car starts fine later on in the afternoon. that is why i thought it was a battery issue. I got a new car battery but the problem still exists. It must be something temperature related. I just have no idea what it is. I just tried to start it again and now it is giving me 3 error messages. ESP BAS ABS errors
Key will not turn in ignition. Now brake lights are on and wont go off!!!! HELP

Last edited by houddini09; Oct 21, 2011 at 10:20 AM.
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Old Oct 22, 2011 | 08:51 PM
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replace brake light switch
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Old Oct 23, 2011 | 09:09 AM
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Originally Posted by benz_addict
replace brake light switch
excuse my ignorance but what does the Brake Light Switch do exactly ?
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Old Oct 23, 2011 | 09:46 AM
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I understand that the brake light switch might be causing the ABS/ESP/BAS error, But would it also cause the key not to turn in the ignition. Keep in mind that the key does turn when the weather is warmer. Could this be a problem with the EIS? but if so then why does it work every time the weather is warmer than 75 degrees

Last edited by houddini09; Oct 23, 2011 at 11:04 AM.
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Old Nov 28, 2011 | 02:35 PM
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i had the same exact problem and now i cant even get the car to start. I replaced the battery and now the alarm just turns on and the car wont let me start it. I have no clue what to do
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Old Nov 28, 2011 | 03:33 PM
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Same here...since replacing the battery and the key the alarm goes off everytime i open the door. If you figure it out please let me know
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Old Nov 29, 2011 | 09:31 AM
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You didn't happen to buy the cheap battery for the key, (or from the ones internet) did you?
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Old Nov 29, 2011 | 09:42 AM
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the immobilizer might need to be recoded or replaced (not sure if on your platform it can be recoded anyway).

this is a dealer-only item/ activity.
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Old Dec 1, 2011 | 03:36 AM
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2003 cl55 amg
new key and battery from MB dealership
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Old Dec 1, 2011 | 04:14 AM
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Next time you manage to get into your car and start it, drive straight to the dealership and have them find out what the issue is.
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Old Dec 4, 2011 | 08:39 PM
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2003 CL55 AMG; 2007 BMW X5 4.8; 1971 Mustang; 1966 Mustang; 1968 Triumph Spitfire
I'll bet it is the EIS module. Get your checkbook ready.
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Old Dec 16, 2011 | 11:40 PM
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id have to guess its the EIS . my 2001 E55 would start though when the brake lamp switch was bad it just wouldn't let me put the car into drive period. obviously you have to press the brake to drive the car so when that switch goes bad the car has no clue your hitting the brakes so it won't release the shifter then guess what your ****ed. its a corny little plastic switch located under the dash. thank god i have a real friend who happens to work at benz and had one of these on another car he was doing a side job on or i would have been screwed that night. if you know what your doing the brake lamp switch takes about 15 minutes to install.
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