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Hello, this code indicates that the engine did not start or loses power, it doesn't actually run for fifteen seconds this is the time the hybrid system spins the engine and if it doesn't fire shuts down and gives you this code, the problem is the gas engine itself, it won't start. Are there any other engine system related codes? One thing you can try is replacing the spark plugs, if the engine has over 100,000 miles on it and try cleaning the throttle body, make sure the electrical connector is connected at the throttle position sensor.
Thanks, ***** ***** spark plugs and replace if they have more than 100K miles on them also check for any oil deposits on the plugs.
After it started running did you clear the code?