Home >> Lexus >> 2021 >> ES 300h Luxury >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Hybrid) - Diagnostic Codes (2 Of 5) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C1242: Open Circuit in IG1/IG2 Power Source Circuit [06/2018 - ] >> Typical Malfunction Thresholds