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Home >> Chevrolet >> 2016 >> Silverado 1500 SSV, 4WD, Part Time T/Case Control, Gas >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U01A1: Lost Communication with Hybrid/EV Battery Interface Control Module 2 >> Circuit/System Description

Circuit/System Description

This diagnostic monitors the internal battery communication status between the K114B Hybrid/EV Powertrain Control Module 2 and the K112 Hybrid/EV Battery Interface Control Modules. The diagnostic monitors K112 Hybrid/EV Battery Interface Control Modules data availability whenever this private communications bus is active. The communication network between K114B Hybrid/EV Powertrain Control Module 2 and K112 Hybrid/EV Battery Interface Control Modules is in a daisy-chain architecture. Therefore, a break at any point in the communication bus results in a loss of K112 Hybrid/EV Battery Interface Control Modules communication with the K114B Hybrid/EV Powertrain Control Module 2. If any data is received, the diagnostic will report a pass. If no data is received for greater than 4.5 s, the K114B Hybrid/EV Powertrain Control Module 2 will attempt to initiate the K112 Hybrid/EV Battery Interface Control Modules into a communication mode where the K112 Hybrid/EV Battery Interface Control Modules can perform their own internal communication loop back, bypassing the daisy-chain. If this is the first K112 Hybrid/EV Battery Interface Control Module in the daisy-chain that the K114B Hybrid/EV Powertrain Control Module 2 cannot re-establish communication with, this diagnostic will fail.

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