Shift, TCC, PWM and EPC solenoids with internal harness, pan filter and gasket for a GM 4L60E, so one pan drop replaces the whole electrical side.
When a 2003, 2004 or 2005 GM truck or SUV with the 4L60E starts throwing P0753, P0758, P0748 or P0740, drops into a fixed gear, or stops locking the converter on the highway, most shops replace the solenoids and the internal harness together rather than one piece at a time. This master kit is built for exactly that job on 2003-2005 units. It bundles the shift solenoids, the TCC solenoid, the TCC PWM solenoid and the EPC pressure control solenoid with a new internal wiring harness, and adds a pan filter and pan gasket so the whole electrical side is renewed with one pan drop.
These three model years sit at the end of the longest-running 4L60E electrical layout. From 1996 through 2005 the unit used the same lineup: a pressure control solenoid, two on/off shift solenoids, an on/off TCC solenoid working with a PWM TCC solenoid, an on/off 3-2 downshift solenoid and the pressure switch manifold. The two shift solenoids are switched in four on/off combinations to give 1st through 4th. The EPC solenoid is the only one the computer varies continuously, and it sets how hard each shift lands. The TCC pair enables the converter clutch and controls how gently it engages. Because this layout ran so long, parts and wiring for these years are well understood, but by now most of these trucks have well over 150,000 miles on the original harness and solenoids.
A batch of solenoid codes all at once is the classic trap on these trucks. Every solenoid shares one ignition feed that runs from the battery, through the ignition switch and a fuse, to terminal E at the transmission connector. ATRA notes that a worn ignition switch can drop that voltage enough to set solenoid codes while the rest of the truck seems fine, so check the fuse and compare voltage at the fuse to battery voltage before you pull the pan. If the feed is good, meter each solenoid at the case connector. Our shift solenoid A and B code guide explains P0753 and P0758, and the TCC solenoid and P0740 guide covers the lockup side. If everything reads correctly and the shift complaint stays, vacuum test the valve body for bore wear.
The listed fitment is 2003-2005 GM 4L60E transmissions, which covers Silverado 1500, Sierra 1500, Tahoe, Yukon and Suburban models of those years along with other GM applications of this unit. The listing carries a long list of OEM cross-references, including 10478112, 10478120, 10478131, 24230298, 24215111, 24219581, 24220158, 24203101, 24209276, 8677314, 8684216, 24212690, 24227792, 8683187, 24212327, 24203267 and 24209121. Because the 4L60E harness and solenoids changed across model years, match your old solenoids, harness and case connector to the product photos, or send us your year and VIN and we will check it for you. The 2006 and later units use a revised harness and are not covered by this listing. The full lineup for this transmission is on the 4L60E parts page.
If the pan shows heavy friction debris, plan on an overhaul instead; the Raybestos high energy 3-4 clutch pack addresses the 4L60E's best-known weak spot, and a 4L60E holding fixture makes the bench work much easier.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for 2003-2005 GM 4L60E transmissions, such as the Silverado 1500, Sierra 1500, Tahoe, Yukon and Suburban of those years. Match your connector and solenoids to the photos or send us your VIN.
Not as listed. GM revised the internal harness and pass-through connector in 2006 when the input speed sensor was added. Look at a 2006-up specific kit instead.
Maybe not. All the solenoids share one ignition feed, and a weak ignition switch, blown fuse or poor crimp on that circuit can set every code together. Check the feed voltage first.
Yes. Clear the codes and run the adaptive relearn with a scan tool. Without it the computer keeps old shift adapts and the truck can shift harsh or late.
The kit already includes a pan filter and pan gasket. Use fresh Dexron VI, and if the fluid is burnt or full of debris, plan on rebuilding the clutch packs too.
