Lexus RX400h Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Lexus RX400h

Lexus RX400h Problems

Rocking or Surging Feeling at Freeway Speeds of 70mph

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.

P0AA6 Check Engine Light warning and code and Water Leakage by Trunk Door Stays and Damage to Hybrid Battery System

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 ...

Check 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.

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Lexus RX400h Questions

Having issues with lexus rx400h after replacing axle (1 answer)

So about 2 days ago I replaced the front axle on the front passenger side, now it is popping up check awd system and check vacation system, and my rear electric motor is not operating any information on a sensor issue maybe?

Are 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)

Thank You

Brakes vibrating at a slow speed.... (1 answer)

107,000 miles, about a month ago, brakes started doing a vibration/shake when stopping in parking lots, parking spaces, garage, etc. all at very slow speeds, and the vibration would occur just before final stoppage. Braking at normal speeds seems normal without any loss. But the vibration at pa...

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Lexus RX400h Recalls

Various 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.

Various Issues Due to Failed Crankshaft Pulley

The amount of adhesive applied between the inner and outer parts of the crankshaft pulley may be inadequate. If this is the case, the outer ring may become misaligned and/or not properly rotate with the inner ring, causing an abnormal noise and/or illumination of the Check Engine Light. In some cases, the power steering belt could come off resulting in a loss of power steering assist, increasing the risk of a crash. Dealers will inspect the crankshaft pulley and replace it if necessary.

Warning Lights, Drivability Issues, and/or Stalling Due to Failed Hybrid Inverter Module

A module inside the hybrid drive inverter module may contain inadequately soldered transistors. These solder joints could fail under high electrical loads, resulting in illumination of various dashboard warning lights, drivability concerns, and/or engine stalling. If the vehicle were to stop unexpectedly, this would increase the risk of a crash. Owners will be notified in July 2011 if their vehicle is involved in this recall. They will received a second notice when parts become available. Dealers will inspect the hybrid inverter module production number to determine if the inverter contains the suspect transistors. They will replace any affected modules.

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Lexus RX400h Reviews

Need to have a zero reliability, I would give a zero.
I have over 112,000 miles on the car and have replaced the radiator. I had the right headlight housing replaced under recall extended warranty because of condensation. The low tire pressure light was on for almost a year until someone told me it was my spare tire activating the light, even though the spare was in the trunk. I added air to the spare and the light went off, never to return. ...
Have 190,000 miles, only changed the tires and the radiator.Best car ever. Considering changing the time belt now!

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