× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P1391 Diagnostic Trouble Code Discussion for November 2013

CKP Or CMP Sensor Signal Intermittent

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P1391
Help Request Posted
1996 Dodge Caravan 3.0L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2B4FP2536T
P1391: CKP Or CMP Sensor Signal Intermittent. this vehicle has a p1391 code.. feels like a missfire when started cold also on accel just off idle feels like its missfireing but at higher rpm seems to improve.it seems to improve when the vehicle warms up but again just off idle it has what feels like a mis...
November 07, 2013
2001 Dodge Ram 1500 WS 3.9L Excessive Emissions, Poor Idle Quality, Cuts out VIN: 1B7HC16X01
P1391: Loss of CMP/CKP Signal. The truck will start, run, but runs like it is out of time. Checked timing with balancer at TDC and Rotor indexed on the No.1 cylinder mark and verified piston at TDC on compression stroke. All spark plugs were black from running rich.
November 08, 2013