Renal artery pseudoaneurysms (RAPs) are vascular lesions that have most commonly been reported secondary to penetrating renal trauma and iatrogenic injury. We present the first case of a RAP that developed as a result of an isolated deceleration injury. The patient presented 3 years after his injury with symptoms of gross hematuria, right flank pain, and syncope. Diagnosis of his RAP was made by magnetic resonance imaging (MRI) and angiography. He was successfully treated with angioembolization.