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Check Charging System,Steering Locked
I'm having a recurring problem with my 2015 Camry Hybrid. The hybrid system refuses to start, and two messages display: "Check Charging System" and "Steering Locked". This has happened four times so far in 3 months, and each time the system works again after about 5 minutes and 4 or 5 tries. Each time, I had gotten out of the car and re-entered before I have the final, successful start. It hasn't (yet) stranded me for more than 5 minutes or so.
I started to think it was the 12V battery voltage dipping too low, but now am fairly sure I can eliminate that as the cause. After the third failure, I used an Arduino to log battery voltage, and this was connected and recording when the forth failure occurred. I was surprised to see that the voltage did not drop below 12V during the forth failure. In the data I've collected, I occasionally see voltages spike below 11 volts without bad behavior. The logs usually show a 12.6-ish voltage before start, then a dip when the fuel pump runs, an initial charge voltage in the 13's, and a step up to the final steady charge voltage of about 14.3V that continues until the car is turned off.
I brought the car to Toyota and they said the battery and charging system checked out fine. I had the battery tested at another shop and it passed there too.
There was a recall on the electric steering modules on some 2015's, but I have not received a letter.
I thought I'd post it in case this sounds familiar to anyone, and there may be a solution.