What is the test for a great bodily injury enhancement in a motor vehicle accident case?

On appeal, defendant challenges the sufficiency of the evidence to support the great bodily injury enhancement. He also contends his trial counsel was ineffective for failing to request CALCRIM No. 3428, the standard jury instruction on mental impairment as a defense to specific intent or mental state. Finally, he asks this court to independently review the transcript of the in camera hearing on his motion for discovery from police officer personnel records pursuant to Pitchess v. Superior Court (1974) 11 Cal.3d 531 (Pitchess).