× 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

P0646 Diagnostic Trouble Code Discussion for January 2014

A/C Compressor Clutch Relay Control Circuit Short To Ground

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 P0646
Help Request Posted
2004 Ford F-250 Super Duty Lariat 6.0L No Start VIN: 1FTNX21P74
P0646: Turbo Boost. Hello fellow techs, have this 6 uh-oh that won't start. Have no rpm signal. Has new IPR, Crankshaft sensor, and camshaft sensors. Wires are good from both sensors to PCM. What kind of voltage do we need at cam and crank sensors, Alldata is really sketchy on th...
January 21, 2014