Question about 1996 Jeep Grand Cherokee

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What does error 12 and 55 means?

The car wouldn't start at first the dashboard, alarm, immobiliser wasn't on. then thanx to the FixYa expert i disconnected the battery and the car started, but the dashboard, alarm, immobiliser works on and off, i used the key to get the error codes and they came up as 12 and 55. maybe someone can tell me what they mean and or how to fix my problem.

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Hi Sambouka

My name is Dave.

Error 12 means that within the last 50 key starts there was a condition where the battery was disconnected and thus the computer as well. It could mean your battery was low on one of those occasions. Perhaps the interior light was on while the car was off, etc. If you have recently had trouble with the battery and since fixed it that would be the problem. You can check the state of your battery with a digital multimeter if you have one. With the multimeter set to DC probe the two posts with vehicle off. There should be a reading around 12.6V give or take a few. Try this after the car has been off for some time like first thing in the morning. After you start the car the reading should go to around 14.5-14.8V. Have an assisstant turn on the heater/ac blower motor to high. The reading should drop initially and then climb back up. If it does not then your alternator is not charging the battery properly. Turn the vehicle off and watch the voltage drop back down to around 12.5 and hold there; if it continues to drop below that (you may have to come back after a while to check this) then one or more of the battery cells is faulty.
Code 55 means that the diagnostic test is complete and there are no more codes stored.
If the issue with code 12 is resolved or if you do not have a multimeter I would reset the computer and see if the code returns.
You may be able to reset the computer in that particular car by moving the vehicle a few feet forward then a few feet backward 3 or 4 or 5 times. If your check engine light is on you will see it go out if it resets. Failing that and without an OBD(On-Board Diagnostics) scan tool you can disconnect the battery for (negative cable only) for about ten minutes. This will reset the computer. Of course it will also reset your clock and radio presets.
All the best,
Dave

Posted on Dec 02, 2008

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