Valve Body Guides
Valve Body Failure Signs: What to Notice, and What to Check Next
A failing valve body rarely fails in one dramatic moment. It usually shows itself gradually, through shifts that feel wrong, pressure that does not hold, or oil where it should not be. This guide describes the signs in plain terms, explains which valve body parts can sit behind each sign, and sets out what to check before deciding between repair, a solenoid kit, or replacement.
GuideShift Solenoid Guide: How Shift Solenoids Work and How They Are Checked
A shift solenoid is the valve body part that turns a commanded gear change into hydraulic action. This guide explains that job in plain terms, describes the faults that belong to shift solenoids, explains how bench testing checks shift response, and sets out what to confirm before ordering a shift solenoid or a solenoid valve kit.
GuidePressure Control Solenoid Guide: How Line Pressure Is Regulated and Checked
A pressure control solenoid regulates the oil pressure behind every shift and every clutch application in the valve body. In company materials it is described as the EPC solenoid, short for electronic pressure control. This guide explains what it regulates, what happens when it cannot hold stable pressure, and how pressure stability is checked on the bench.
GuideTCC Solenoid Guide: How Lock-Up Works and What Lock-Up Faults Mean
A TCC solenoid controls torque converter lock-up: the moment when the converter stops slipping and clutches directly, for efficient cruising. TCC stands for torque converter clutch, and the same function is also called the lock-up solenoid. This guide explains lock-up in plain terms, describes the faults that belong to it, and sets out how a lock-up solenoid is checked.
GuideValve Bore Sleeve Repair Guide: Why a Worn Bore Needs a Sleeve
A worn valve bore is one of the most consequential faults in a valve body, and also one of the easiest to repair badly. This guide explains how bores wear, why the documented repair is a sleeve rather than polishing alone, where sleeve repair sits in the repair sequence, and what a buyer should ask before a repair is agreed.
GuideValve Body Bench Testing Guide: How to Ask for, and Read, a Bench Test
Bench testing is the most useful phrase in valve body buying, and also the most abused, because testing can mean anything from an electrical check to a full hydraulic verification. This guide defines bench testing as documented for this site, explains its four checks, explains why electronic and hydraulic checks belong together, and shows how to read a bench result in an inquiry.
GuideMechatronic Unit Guide: Electronics and Hydraulics in One Unit
A mechatronic unit combines electronic control with the hydraulic valve body in a single unit. In the company parts list it is described as a DCT integrated electronic valve body. This guide explains what integration changes for a buyer: how faults are investigated, how testing works, and how a mechatronic inquiry differs from a conventional valve body inquiry.
GuideValve Body vs Solenoid Kit: Choosing Between Three Routes
Three routes cover most valve body jobs: a complete valve body assembly, a solenoid valve kit, and a single solenoid. They differ in scope, in what faults they can correct, and in the work each route involves. This guide compares them on the same terms so that a buyer can choose the route that fits the fault, rather than the route that was ordered last time.