Question about 1998 Jeep Cherokee Grand 2WD

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Rough idle, and rough in the 50 - 65 mph

My 94jeep grand cherokee started running rough a couple of weeks ago, and they read the code and said it was a sensor regarding the acceleration. so, we replaced it, still running rough and getting worse. when we read the code using the key turn trick, it comes up 12 13 55. can anyone help me find out what this means?

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  • Anonymous Mar 31, 2014

    when i get to about 55 mph engine shrugs can let off gas engine smoothes out whats wrong

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  • 111 Answers

Code 12 is start

13** No difference recognized between the engine MAP reading and the barometric (atmosphereic) pressure reading at start-up

Code 55 is end so 13 is all you need , basically your map isnt working
its an easy fix if thats all , take one off , put new one on

Posted on Dec 11, 2008

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