Home >> Lexus >> 2010 >> HS 250h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control (Diagnostic Codes (P0AA6-526 - U0424-537) & Circuit Tests) >> Hybrid Control System >> DTC U0028-437: Vehicle Communication Bus "A"; DTC U0037-438: Vehicle Communication Bus "B" >> Typical Malfunction Thresholds