DTC U1064: Loss Of Serial Communications - PZM: Description

Class 2 serial data circuit is used to communicate information between systems. Each system on the serial data line is assigned its own recognition code, which is used to identify which system is communicating. Systems send a State of Health (SOH) message every 5 seconds to other systems. If those systems fail to send an SOH message back, a corresponding DTC will be set.

DTC U1064 will set when IPC has sent an SOH message to Platform Zone Module (PZM), and no SOH message response was sent back for 3 consecutive monitoring cycles. When DTC U1064 is set, fuel level will default to empty, and range and fuel economy information will display dashes. DTC U1064 will clear when PZM transmits a SOH message to IPC.