4L60E Master Solenoid Kit with Pressure Switch and Harness

A full electrical refresh for the GM 4L60E and 4L65E (RPO M30 and M32) built for 2003-2005 units. The kit covers shift solenoid A, shift solenoid B, the 3-2 downshift solenoid, the EPC (pressure control) solenoid, the TCC PWM solenoid, the TCC on/off solenoid and the transmission fluid pressure manifold switch, along with the internal wiring harness, a pan filter and a pan gasket. Listed OEM cross-references include 24230298, 24215111, 24219581, 10478112, 10478120, 10478131, 8677314, 8684216, 24220158, 24209121, 24203101, 8683187, 24208576 and 24212690. Compare your old harness connectors and pressure switch to the photos before ordering, since 4L60E solenoid layouts changed across model years.

This is the kit for a truck or SUV setting codes like P0751/P0753 (shift solenoid A), P0756/P0758 (shift solenoid B), P0748 (pressure control), P0740/P0741 (TCC) or P1870, or one that is stuck in second gear limp mode, flaring on the 1-2, or not locking the converter. The pressure manifold switch is included because a leaking or failed switch reads the wrong range to the PCM and causes erratic shifts that look like a solenoid fault, so replacing it with the solenoids takes it off the suspect list.

On the bench: drain and drop the pan, pull the filter, and unplug the case pass-through connector. Remove the solenoid retaining clips and the pressure switch bolts, lift the harness and solenoids out as one, and lay the new set in with a light coat of ATF on every O-ring. Torque the pressure switch bolts evenly so the gasket seals, route the harness the way the old one came out, reconnect the pass-through, then fit the new filter and pan gasket and refill.

Clear codes and run the adaptive shift relearn with a scan tool after install. Skipping the relearn is a common cause of harsh or soft shifts after a solenoid swap.