In NHTSA's crash sample (CRSS, 2019–2022), 1.9% of police-reported crashes that cite steering ended in a serious or fatal injury, against 2.3% of all police-reported crashes. A crash that cites a system is not necessarily a crash that system caused.
What it shows: No Apparent Injury is the largest at 68.5%, followed by Possible Injury at 15.5%; the smallest shown is Suspected Serious Injury at 1.9%.
Data and chart by CalcScrape: Power Steering Repair