Question about 2002 Jeep Grand Cherokee
Posted by Anonymous on
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Posted on Jan 02, 2017
12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle. Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.
Posted on Dec 16, 2008
P0733=Gear 3 Incorrect Ratio
P0734=Gear 4 Incorrect Ratio,
your transmission is in "limp" mode,
Have the following sensors checked on the transmission,input sensor,output sensor,and speed sensor.
The transmission is not getting a signal from one of them,So it doesn't know how fast your going so it doesn't up shift.
Posted on Jan 22, 2010
12 is just telling you that battery has been disconnected or dead recently. No worries.
21 is oxygen sensor, which will likely need replacing.
Posted on Feb 15, 2010
if it is on the check engine light, get a book for it. on one of the pages it will show you that you will have to turn the on off on off then back on. first the check engine light will blink from 1 to 7 time i belive then pause and blink again.. when it does pu the numbers together and it will be like lets say blinks 5 times.. pauses then blinks 5 times again.. that wil be 55 that will say no codes are present that rea computer related
Posted on Feb 22, 2010
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