Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I have jeep patriot goes in Limp mode , had code P0335 (crank sensor) proved out ciruit and replaced sensor and cleared memory and did addaptive relearn , ran good no codes came back sat over nite next morning went to start long crank started check engine lite came on was flashing read codes P0300 and P0335 and went into limp mode, re did addaptive learn ran great scan tool showwed in sycn on cam n crank . could it be PCM loosing memory
Up date the jeep is fixed the crank sensor they sold me wasnt a dealer part even though i exchanged it twice . USE UR SCOPE AT PCM CHECK SIGNAL IS PRESENT THESE BAD SENSORS WERE PULLING SIGNAL TO GROUND
