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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer, I would like to know the mileage of your grand cherokee and know when was the last time you replaced the timing kit?
Dear customer, what happens is that the error code that you are presenting is related to the timing of the crankshaft position sensor and precisely the symptoms that they present are related to this, I could tell you that the problem is the sensor and that it must be replaced but as Your model already has more than 150,000 km and the distribution kit has never been replaced at least every 120.000 the replacement shall be done, therefore you have to do it, anyway I recommend you to check the sensor connections and if you want to replace the sensor since it is cheaper than the distribution kit do it, but if the problem persists you will surely have to replace the timing kit.
I recommend replacing it but there are technicians who do not, in reality a chain is very difficult to break, normally it can be a failure in a link to damage a chain but this is very difficult, and what happens with the gears is that the wear of the chain has to be the same as that of the gear because if you put new gears with the used chain they will create noise, then this depends on the technician. I repeat, I personally rather replace the entire kit.