Question about 1996 Jeep Grand Cherokee

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JEEP CODES P1391 AND P1398 - 1996 Jeep Grand Cherokee

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P1391= crankshaft / camshaft position sensor intermitant signal, check, wiring, connections & sensors
p1398= engine control system missfire detection limit reached probable causes, wiring,poor connections,engine mechanical fault,ignition/fuel system fault (causing misfire) or camshaft/ crank shaft position sensor

Posted on Jun 04, 2010


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Known problems

on a 2003 jeep liberty sport 3.7 liter getting codes of p0340 and p1391. its a reman motor. first 600 miles of break in we had no problems then we did a oil and filter change. we ffirst got the p1391 code and changed both the cmp and ckp sensor and ended up with both codes.

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