Hi have the same trouble with mine been told to replace the Dist Module also known as halleffect sensor
Hope this helps
Mike
I am not sure what you mean by reconfigured. If the cruise is not working the first things to check are the vacuum supply to the servo and to check the pcm for trouble codes.
With your key in the ignition switch and in the off position, switch key to on (not to start), then back to off, then on, off again, then on a third time. If you have trouble codes they will read on your odometer display. For example: P0303, etc. When it is done displaying codes or if there are no codes, it will read P done.
Code 55 comes at the end of every code reading. It tells you that that is the end of the trouble codes. What ever code you get before it is the problem. If you get no code before, then you have no problems that you powertrain control module recognizes.
With a scan tool, or unhooking the battery.
The diagnostic code 12 51 55 is actually not a code for the 1994 Jeep Grand Cherokee Laredo. The 12 means that it has started searching for codes. The 51 is oxygen sensor stuck lean. The 55 means it is finished searching for codes. Getting this means nothing is wrong.
You need a scan tool to read codes. ....
Battery? No spark? No fuel? Any trouble codes in the computer?
Is the TCM working normally and throwing no codes?
This is the code showing that the computer is working normally. There are no trouble codes when a code of 12 is blinking.
There are trouble codes in the computer systems. You need to have the PCM, ABS, etc checked for codes to know possible causes.
That is the message you get when the system has completed showing any trouble codes in the odometer display. You get there by cycling the ignition on, off, on, off, on.
Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical
Just did this trouble code check to my 95 s-10. 12 code is the code showing your in diagnostic mode (flashes 12 three times). The code following this will be your problem's code. Mine was 13 (open wire at oxygen sensor). Replaced sensor and disconnected neg. batt cable to reset. I have list of codes if you need. Kevin
Did you remember to clear the codes from the computer? OBD II systems have the ability to retain trouble codes even if the battery is disconnected so you will need a code scanner to retrieve the codes to have them cleared out so the computer knows the problem has been addressed.
Diagnostic Trouble Codes.
Borrow, rent or buy a good quality OBD2 code scanner. The good ones let you clear the codes. Any codes that WON'T clear are usually caused by a failed component that needs to be replaced.
I am not sure what you mean by reconfigured. If the cruise is not working the first things to check are the vacuum supply to the servo and to check the pcm for trouble codes.