Bore wear at the TCC apply valve allows critical pressure loss that prevents proper TCC operation.
Recover hydraulic control and restore normal TCC action by reconditioning the bore and installing Sonnax oversized TCC apply valve.
Vehicles equipped with ZF5HP19 transmissions often encounter TCC troubles such as RPM surge, overheating, apply and release concerns and TCC codes. These problems can often be traced to excess bore wear at the TCC apply valve, which permits crucial control pressure to exhaust. Reconditioning the bore and installing Sonnax oversized TCC apply valve 85755-08 shores up the hydraulic integrity of the circuit for renewed TCC operation and control.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.