CUSTOMER CONCERN The 12-volt battery goes dead because of a 1.08-amp parasitic draw; removing engine-room junction-block fuse 13 drops the draw to 0.015 amp. CAUSE A rear reading light remained switched on and was difficult to notice, creating the parasitic load on the dome-fuse circuit. CORRECTION Switch off and correctly position the rear reading-light switch, then verify the parasitic draw remains at approximately 0.015 amp.

CUSTOMER CONCERN The check engine light is on with oxygen-sensor circuit DTC P0136 stored. CAUSE Circuit, fuel-trim, and exhaust-leak checks confirmed a failed rear oxygen sensor at Bank 1 Sensor 2; the hybrid-control calibration also required the applicable update. CORRECTION Remove and replace the Bank 1 Sensor 2 oxygen sensor, then update the Hybrid Vehicle Control ECU with the applicable calibration.

CUSTOMER CONCERN The check engine and hybrid warning lights are on with DTC P0A80 stored. CAUSE Battery-block voltage testing confirmed excessive voltage variation caused by deterioration inside the high-voltage battery pack. CORRECTION Remove and replace the high-voltage hybrid battery pack.

CUSTOMER CONCERN The hybrid warning light is on with inverter-cooling DTC P0A93-346 stored. CAUSE The inverter coolant reservoir was full, but active testing confirmed that the inverter water pump was not circulating coolant. CORRECTION Remove and replace the inverter water pump. Refill and bleed the inverter cooling circuit.

CUSTOMER CONCERN The vehicle will not crank or enter READY mode after collision repair, and DTC P0A0D is stored. CAUSE Interlock-circuit testing confirmed that the battery service-plug interlock switch was not completing the required ground path. CORRECTION Remove and replace the battery service-plug interlock switch and fully seat the high-voltage service plug.

CUSTOMER CONCERN Customer states the 12-volt battery is not charging. DTCs P0A08-264, P0AE6 and P2519 are stored, and battery voltage falls from 12.53 volts with the vehicle in READY mode. CAUSE DC/DC converter power and ground testing confirmed the converter was not producing charging voltage for the auxiliary battery. CORRECTION Remove and replace DC/DC converter. Clear DTCs and verify stable 12-volt charging voltage in READY mode.