ASE Automatic Transmission and Transaxle Practice Test 2026 – Complete Exam Guide

Fluid pressure that increases erratically is often indicative of a faulty pressure regulator valve. The pressure regulator valve is responsible for maintaining consistent hydraulic pressure within the transmission system. If this valve is malfunctioning, it can cause fluctuations in fluid pressure, leading to erratic performance.

While an internal leak at the servo can lead to pressure loss or an inability to engage gears properly, it typically does not cause erratic pressure increases. Instead, an internal leak might present more as a steady drop in pressure rather than erratic spikes.

Therefore, the correct conclusion is that erratic fluid pressure increases signify an issue with the pressure regulator valve, while the servo leak is not primarily responsible for this particular symptom.