Join Now
International Automotive Technicians Network

P1604 Diagnostic Trouble Code Discussion for February 2009

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
2001 Mazda MPV DX 2.5L No Start VIN: JM3LW28Y21
P1604: Key Identification Numbers Not Registered In The PCM. ... thieft system in the pcm. We replaced the pcm with a remanufactured unit. Upon replacement we've attempted to perform the (what we think)code word write into into the pcm using the processe that alldata uses by turning different keys on and off with no suc...
February 24, 2009
2001 Mazda MPV DX 2.5L No Start VIN: JM3LW28Y21
P1604: Key Identification Numbers Not Registered In The PCM. ... thieft system in the pcm. We replaced the pcm with a remanufactured unit. Upon replacement we've attempted to perform the (what we think)code word write into into the pcm using the processe that alldata uses by turning different keys on and off with no suc...
February 24, 2009