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About TCGrace

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  • Lexus Model
    RX 400h AWD
  • Lexus Year
  • Location
    New Hampshire (NH)

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  1. I have a 2008 Lexus 400h with around 113,000 miles on it. A few nights ago it refused to start, saying "Check Hybrid System". Full power to the lights and the dash, just no actual engine start. When I went into the storage well in back to get my tools, I found moisture in the storage well under the matting over to the right, closest to the right rear tail light assembly. I could not see where it might have come from. I got a ride home from a family member. I did a little research and went back to it the following day morning, pulled the battery terminals, waited ten minutes, and tried again. This time it started and drove fine, with the hybrid system itself seeming to work, but I had no cruise control, no control of passenger windows from the driver's seat (the window switches at the actual window worked fine), and the traction control error light was on. I used my BlueDriver to pull codes. I have one Motor Generator Code, P0AA6, "Hybrid/EV Battery Voltage System Isolation Fault". I also have 2 Antilock Brake System Codes, C1231, "Low or High Power Supply Voltage", and C1310. Since then, in order to start it I have to pull the battery terminal and wait a few minutes. It takes longer than usual to start the internal combustion engine, but when it starts there are usually no error codes. Then, somewhere between one and twenty minutes, I lose cruise control and the traction control error light comes on. This morning I pulled all the fuses related to the hybrid system. They were all intact. Any thoughts? Thanks very much. Grace