DTC U1300: Serial Data Line Short To Ground: Description

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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 periodically send a State of Health (SOH) message to other systems. If those systems fail to send an SOH message back, a corresponding DTC will be set. Also, any system that cannot communicate properly will set the corresponding DTC.

When module detects no messages and a low voltage on class 2 serial data line for approximately three seconds, U1300 will set. Setting of all other class 2 serial communication DTCs will be disabled.

If conditions for malfunction no longer exist, DTC U1300 requires an ignition cycle to change from current to history. History DTC U1300 is cleared using Drivers Information Center (DIC) or scan tool.