Replaces the A and B shift solenoids, EPC, TCC PWM and 3-2 downshift solenoid on 1996-2002 GM 4L60E valve bodies in one set.
If your 1996-2002 Silverado, Sierra, Tahoe, Suburban, Yukon, S10, Blazer, Astro or Camaro has started leaving in second gear, hanging in third, banging into drive, or refusing to lock the converter, the electrical side of the 4L60E valve body is the first place to look. This set replaces the five solenoids that run that valve body in one job: shift solenoid A (1-2), shift solenoid B (2-3), the electronic pressure control (EPC) solenoid, the TCC PWM solenoid and the 3-2 downshift control solenoid. All five are new.
The 4L60E has no throttle valve cable and no governor. The computer picks every gear by switching two on/off solenoids, and ATRA's solenoid chart lists the pattern: both on for first, only B on for second, both off for third, only A on for fourth. The EPC solenoid is a variable-current valve that sets line pressure, and the TCC PWM solenoid feeds the converter clutch a pulsed signal so lockup comes in smoothly. All of them work from the same regulated feed; Sonnax notes the AFL valve holds that supply near 115 psi before it reaches the shift, pressure control, TCC and 3-2 solenoids.
The year range on this kit matters because of the 3-2 solenoid. Sonnax's valve body identification guide shows that 1993-1995 valve bodies used a metal PWM 3-2 control solenoid, while 1996-and-later bodies switched to a plastic on/off 3-2 solenoid with the old port cast shut. That is why this set starts at 1996 and should not be mixed into an earlier unit.
Test first, because the same complaints come from the harness and from valve body wear. ATRA Technical Bulletin 269 gives the case connector checks: the 1-2 solenoid between pins E and A and the 2-3 solenoid between pins E and B should both read 20-40 ohms, and the pressure control solenoid between pins C and D should read 3.5-8.0 ohms. A reading far outside those ranges, or a short to the case, condemns the part. If every circuit tests good and the scan tool still shows commanded and actual gear disagreeing, the problem is likely hydraulic. Our 4L60E shift solenoid testing guide walks through each step, and the P0748 pressure control guide covers the EPC side in detail.
This set is listed for GM rear-wheel and four-wheel-drive trucks, vans and SUVs built with the 4L60E from 1996 through 2002. Starting in 2003 GM changed the EPC solenoid and the pressure switch manifold, so a 2003-up truck needs the 2003-2007 solenoid kit instead. Model years can straddle a change, so compare the connectors and part numbers on the solenoids you remove with the photos, or send us your year and VIN and we will check it. Every part we carry for this transmission is on the 4L60E collection page.
The solenoids are all reachable with the transmission in the truck. Drain the fluid, drop the pan, pull the filter and unplug the internal harness at each solenoid. Remove the retaining clips and the EPC bracket bolt. Wet each new O-ring with clean ATF and push the solenoid home squarely so the O-ring does not roll, then confirm every clip snaps fully into its groove. Look over the internal harness while it is exposed; if the insulation is cracked or a connector is loose, replace it now rather than later. Install a new filter and pan gasket, refill with Dexron VI, check the level hot, clear the codes and road test through every gear, lockup and a 3-2 downshift. If the valve body itself proves worn, a TransGo separator plate and gasket kit is a common repair to pair with new solenoids during the same job.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The kit is built for 1996-2002 units. GM changed the EPC solenoid and the pressure switch manifold for 2003, so later trucks need the 2003-and-up solenoid set. If your truck was built near the changeover, match the old solenoids or send us your VIN.
The 1993-1995 valve bodies used a metal PWM 3-2 control solenoid. From 1996 GM switched to a plastic on/off 3-2 solenoid with the old port cast shut, so the 3-2 solenoid in this kit only suits 1996-and-later bodies.
No, but every solenoid in the valve body has run in the same fluid for the same miles. With the pan already off, replacing the full set avoids dropping it again for the next one to fail. Test each circuit first so you know the problem is electrical.
Use a Dexron VI fluid, which GM specifies as the service fill for the 4L60E. Install a new filter and gasket, then check the level with the transmission at operating temperature.
Clear the stored codes, then drive the truck through every gear, converter lockup and a few 3-2 downshifts so the computer sees normal operation. If a code returns quickly, recheck the harness and connector pins before suspecting the new parts.
