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P1391 Diagnostic Trouble Code Discussion for September 2010

CKP Or CMP Sensor Signal Intermittent

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Trouble Ticket Help Requests for DTC P1391
Help Request Posted
2000 Jeep Grand Cherokee Limited 4.0L No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1J4GW48S5Y
P1391: CKP Or CMP Sensor Signal Intermittent. This is a low mileage 2000 jeep G-C The above codes are historic and only a #2 coil pimary comes back. This is EPA, AT, w/ AC, Not CA. This will run perfect than misfire, intermittently... then stall / no restart. NEVER shows a misfire on the Modis when it ...
September 15, 2010
1997 Jeep Wrangler Sport 4.0L MIL Lamp on VIN: 1J4FY29P8V
P1391: CKP Or CMP Sensor Signal Intermittent. Changed engine in this jeep with rebuilt engine. Installed new clutch resurfaced flywheel. After engine swap check engine light came on with code for crank sensor. I assumed I bumped sensor during swap so I changed ckp with new sensor. no change. My question i...
September 29, 2010