2008 Lexus RX400h Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2008 Lexus RX400h
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2008 Lexus RX400h ProblemsCheck Engine Light With Code P0AA6
The Check Engine Light may illuminate with code P0AA6 stored for a hybrid battery isolation fault. Our technicians tell us this may be caused by water intrusion into the high voltage battery case. The water may be a result of cracking body seam dealer above the rear door strut mount. Any water leaks should be repaired and the high voltage battery system inspected for water damage and repaired and dried as necessary.
Hybrid vehicles may notice a rocking or surging feeling at freeway speeds of 70mph. Our technicians tell us new software is available for the hybrid powertrain control module to correct this concern.
Our Lexus displayed a check engine warning and P0AA6 Code and then immediately stopped working. Upon inspection at dealer, the entire bottom floor of the cabin (under the floor boards) was flooded without any visible water damage inside the cabin or any visible point of water entry. We were given an estimate of approximately $11,000 to repair because the entire hybrid battery system had to be replace, inverter and other components along with ...
2008 Lexus RX400h QuestionsAre used Hybrids with 100,000 miles too risky to consider purchasing? Should I just make life simple and buy a non hybrid? Are there proactive measures to take for a RX400h to last 300,000 miles? Thank You! (1 answer)
2008 Lexus RX400h RecallsVarious Concerns With the Hybrid Drive System
Two of the main control modules for the hybrid drive system are the Inverter Module and the Intelligent Power Module (IPM), which is located inside the Invertor Module. The IPM can operate at temperatures high enough to damage its electrical solder connections. Damaged solder joints can result in illumination of warning lights, various drivability concerns, and possible stalling of the hybrid drive system. Dealers will replace the IPM on affected vehicles to correct this concern.