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Home >> Chevrolet >> 2020 >> Sonic LS >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications >> Diagnostic Information and Procedures >> DTC U0073 or U2100 >> Circuit/System Description

Circuit/System Description

The devices connected to the high speed GMLAN serial data circuits (circuit numbers 2500 & 2501) monitor for serial data communications during normal vehicle operation. The high speed GMLAN serial data bus uses terminating resistors that are in parallel with the high speed GMLAN (+) and (-) circuits.