Replaces the 1-2 and 2-3 shift solenoids, EPC, TCC PWM, 3-2 control solenoid and pressure switch manifold on 2003-up GM 4L60E and 4L65E valve bodies.
If your 2003-or-later Silverado, Sierra, Tahoe, Yukon or other GM rear-drive truck is stuck in second, banging into gear, flaring between shifts or throwing solenoid codes, this six-piece kit replaces every electrical control on the 4L60E valve body in one job. It contains new 1-2 (A) and 2-3 (B) shift solenoids, the late-style pressure control (EPC) solenoid, the TCC PWM solenoid, the 3-2 control solenoid and the transmission fluid pressure (TFP) switch manifold. It is built for the 2003-up valve body and also fits the 4L65E and 4L70E that share it.
The 4L60E has no shift linkage to the governor or throttle cable - the computer runs everything through these parts. Shift solenoids A and B are simple on/off valves, and the combination of the two picks the gear: both on for first, A off and B on for second, both off for third, A on and B off for fourth. The EPC solenoid is a variable-force valve that sets line pressure, so it decides how firm every shift and every engagement feels. The TCC PWM solenoid pulses the converter clutch on smoothly, the 3-2 control solenoid times the 2-4 band and 3-4 clutch overlap on downshifts, and the TFP manifold is a set of pressure switches that tells the computer which range the manual valve is in. Sonnax notes that the AFL valve feeds all of these from roughly 115 psi of regulated oil, so a sticky AFL circuit or debris affects every solenoid at once - another reason to replace the set rather than one piece.
Solenoid codes do not always mean a bad solenoid. ATRA has documented poor crimps on circuit 1020, the shared power feed, setting several solenoid codes at once, so check the case connector and harness first. With the pan dropped, ATRA's resistance specs give you a quick bench test: the shift solenoids read about 20-40 ohms and the pressure control solenoid about 3.5-8.0 ohms. A solenoid that is open, shorted or way off spec is bad; if all of them test good and the truck still misbehaves, the valve body bores may be worn and a vacuum test is the next step. Our 4L60E shift solenoid symptoms and testing guide walks through the full sequence, and the P0748 pressure control solenoid guide covers the EPC side.
This kit is for 2003-and-later 4L60E, 4L65E and 4L70E valve bodies. The year matters because GM changed the EPC solenoid in 2003: Sonnax's valve body identification guide lists an early EPC for 1993-2002 and a late EPC from 2003 on, so an early truck needs the early part. If your truck is a 1993-2002, use the 7-piece 1993-2008 master kit or another early-year kit instead. Rebuilt or swapped transmissions do not always match the vehicle year, so compare the EPC connector and the TFP manifold on your valve body against the photos, or send us your year and VIN before you order. Everything else we carry for this unit is on the 4L60E parts page.
If you only need the shift pair, the shift solenoid A and B kit is the smaller option, but on a high-mileage unit the full set saves a second pan drop.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. This kit uses the late-style EPC solenoid GM introduced in 2003. A 1993-2002 4L60E takes the early EPC, so choose the 7-piece 1993-2008 kit or another early-year kit. If the transmission has been swapped, check the valve body itself or send us your year and VIN.
Yes. The 4L65E and 4L70E use the same 2003-up style valve body solenoids and TFP manifold, so this kit fits them as well.
Yes. Every part in this kit is on the valve body under the oil pan, so it is an in-vehicle job: drain, drop the pan, remove the filter, unplug and swap the parts, then refill. You do not have to remove the valve body to replace them.
No. This kit includes the TCC PWM solenoid. On the 4L60E the TCC enable solenoid is part of the internal wiring harness, so if that harness is damaged, order a kit that includes the harness.
Refill with DEXRON-VI, which is the fluid GM calls for in the 4L60E. Use a new filter and pan gasket and check the level with the transmission at operating temperature.
Clear the codes, then drive normally through all four gears with light and moderate throttle so the computer can relearn shift timing. A scan tool reset of transmission adapts, if your tool has one, speeds that up.
