4L60E Master Solenoid Kit with Harness, Filter and Gasket

A complete master solenoid kit for the GM 4L60E that bundles the shift solenoids, TCC solenoid, TCC PWM solenoid and EPC pressure control solenoid with the internal wiring harness, plus a pan filter and pan gasket. The listing is built for 2003-2005 4L60E units. Listed OEM cross-references include 10478112, 10478120, 10478131, 24230298, 24215111, 24219581, 24220158, 24203101, 24209276, 8677314, 8684216, 24212690, 24227792, 8683187, 24212327, 24203267 and 24209121. Match your old solenoids and harness connector to the photos before you order, since 4L60E solenoid and switch layouts changed across the model years.

This is the job for a truck or SUV setting solenoid and circuit codes such as P0751/P0753 (shift solenoid A), P0756/P0758 (shift solenoid B), P0748 (pressure control), P0740 or P0741 (TCC), or when it is stuck in one gear, not locking the converter, or shifting harsh from high line pressure. A brittle or chafed internal harness throws the same intermittent faults, so replacing the harness with the solenoids takes it off the suspect list.

On the bench: drain the pan, pull the old filter, and unplug the case pass-through connector from inside. Pull the solenoid retaining clips and bracket bolts, lift the harness and solenoids out together, then install the new set with a light coat of ATF on every O-ring. Route the harness the same way the old one came out so it clears the filter, reconnect the pass-through, then fit the new filter and pan gasket and refill.

After install, clear codes and run the transmission adaptive relearn with a scan tool. Skipping the relearn is a common reason for harsh or erratic shifts after a solenoid swap.