DTC U1301: Class 2 Data Link Shorted To Power: Description

WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

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 module detects no messages and a high voltage on class 2 serial data circuit for approximately 3 seconds, U1301 is set. Setting of all other class 2 serial communication DTCs is inhibited.

DTC U1301 is set when no valid messages are detected on class 2 serial data circuit. Voltage level detected on class 2 serial data circuit is high. Conditions are met for approximately 3 seconds.

When DTC U1301 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 U1301 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 U1301 will clear after 100 ignition on/off cycles with no repeated malfunction.