× 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

P1604 Diagnostic Trouble Code Discussion for January 2010

PCM Internal Dual-Port Ram Read/Write Integrity Failure

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 P1604
Help Request Posted
2002 Mazda 626 LX 2.5L No Start VIN: 1YVGF22D72
P1604: Key ID (Code Word) Not Registered In The PCM. Hey Guys, This 626 was purchased as a wreck at auction and when the guy couldn't get it running, it wound up here. No spark, no injector drive. When I clear the 2 codes, they reset as soon as the key is turned on. The theft light is off when the key is off, ...
January 11, 2010