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Chrysler engine code p1391 4.7L Jeep Grand Cherokee YouTube . Search from 22 used jeep grand cherokee cars for sale, including a 2000 jeep grand cherokee laredo, a 2002 jeep grand. Error code p1391 is defined as cmp or ckp signal intermittent condition. P1391 Code Jeep Cherokee Forum from www.cherokeeforum.com Search from 22 used jeep grand cherokee cars for sale, including a 2000 jeep grand cherokee laredo, a 2002 jeep grand. What the p1391 code means. I checked cam and crank sensor signals with oscilloscope and found faulty crank.