DTC U1305: Class 2 Data Link Shorted To Ground/Power: Description

Modules connected to class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among modules. In addition to this, state of health messages are transmitted by each module on class 2 serial data circuit about once every 2 seconds. When a module detects no messages on class 2 serial data circuit for approximately 3 seconds, with no low or high voltage detected, U1305 is set. Setting of all other class 2 serial communication DTCs is inhibited.

DTC U1305 is set when, no valid class 2 messages are detected on class 2 serial data circuit. Problem is met for approximately 3 seconds.

When DTC U1305 is set, module inhibits setting of all other class 2 DTCs. Module uses default values for all parameters received on class 2 serial data circuit.

Current DTC U1305 will clear and become a history DTC when a valid class 2 message is detected on class 2 serial data circuit or at end of current ignition cycle. History DTC U1305 will clear after 100 ignition on/off cycles with no repeated malfunction.