Tool Required VB-FIX Required
- Burnt Forward clutch
- Burnt intermediate band
- Delayed Forward
- Delayed Reverse
- High line pressure
- Low line pressure
- Pressure control out-of-range codes
Bore wear results in reduced feed pressure to overdrive, intermediate or low/reverse servos or the coast clutch.
Refurbish the valve bore and install the Sonnax oversized valve kit to restore proper hydraulic function and prevent future leakage. This Sonnax kit works in either modulator valve location.
Oversized PCA/PCB Modulator Valve Kit
5R55N units commonly experience low line pressure and delayed engagements, typically resulting in pressure out-of-range codes, burnt forward clutches or intermediate bands. Bore wear at the VFS1 (PCA) and VFS2 (PCB) locations allows modulated line pressure to exhaust instead of feeding the overdrive, intermediate or low/reverse servos or the coast clutch, causing the complaints and damage. Install Sonnax PCA/PCB modulator valve kit 56947J-49K after refurbishing the bore to restore hydraulic control and optimum line pressure feed to affected circuits. Hard anodized material and annular grooves provide a long lasting repair that can beused in either location.
- Critical valve spools incorporate annular grooves for better hydraulic centering and reduced leakage and wear
- Works in either modulator valve location