Replaces all five valve body solenoids on 2003-up GM 4L60E and 4L65E: shift A and B, 3-2 downshift, EPC pressure control and TCC PWM in one kit.
A 2003 or later Silverado, Sierra, Tahoe, Yukon, Suburban or Avalanche with a 4L60E or 4L65E that has started shifting late, banging into 2nd, sitting in one gear or shuddering when the converter locks is usually a valve body solenoid job before it is a rebuild. This kit puts five new solenoids on the valve body at once: shift solenoid A, shift solenoid B, the 3-2 downshift solenoid, the EPC pressure control solenoid and the TCC PWM solenoid, all in the late-style connector pattern GM switched to for 2003.
The 4L60E is a two-shift-solenoid design. The computer switches A and B on and off in four combinations to pick 1st through 4th, so one weak coil can cost you two gears. The EPC solenoid is different: it is a variable-force unit the computer feeds a changing current to, and it sets line pressure through the boost valve. Less current means more pressure, so a sticking EPC can make every shift harsh or let every clutch slip. The TCC PWM solenoid feathers the converter clutch on and off, and the 3-2 solenoid times the 3-4 clutch release on a kickdown. All five are fed from the actuator feed limit (AFL) valve, which Sonnax puts at roughly 115 psi in this family, so a worn AFL bore affects every one of them.
Do the electrical checks first, because a cracked internal harness or a bad crimp sets the same codes. ATRA lists 20 to 40 ohms for each shift solenoid and 3.5 to 8.0 ohms across the pressure control solenoid at the case connector. Our 4L60E shift solenoid symptoms and testing guide walks through the pin map and an ohm test, and the P0748 pressure control solenoid guide covers the EPC. If every solenoid reads in range and the problem stays, the valve body bores are the next suspect, not the parts in this box.
This set is listed for 2003-up GM 4L60E and 4L65E units. The year split is real: Sonnax notes that the early 1992-2002 EPC and the 2003-later EPC use different pins and connectors, so an early kit will not plug into a late harness, and a late kit will not fit a 2002 truck without an adapter. Look at your old EPC and PWM connector before ordering, or send us your year and VIN and we will check it. If your truck is a 1993-2002, see the 7-piece 1993-2008 master solenoid kit. More matching parts are on the 4L60E collection page.
The kit does not include the TCC enable (on/off) solenoid, which is built into the internal harness on these units, or the pressure switch manifold. If your harness is brittle, the 9-piece kit with harness for 2003-2006 covers both.
| Fits | GM 4L60E, 4L65E, 2003-up |
| Includes | Shift solenoid A, shift solenoid B, 3-2 downshift solenoid, EPC pressure control solenoid, TCC/PWM solenoid |
| Pieces | 5 |
| Part type | Master solenoid kit |
| Condition | New |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is built for 2003-up units. The 2002 and earlier EPC and PWM solenoids use a different connector and pin layout, so a 1993-2002 truck needs an early-style kit.
Only if the TCC PWM solenoid is the cause. On high-mileage 4L60E units, P0741 is often worn valve body bores or a worn converter clutch, so test the solenoid and check for bore wear before assuming a new solenoid will cure it.
No. The TCC enable solenoid is part of the internal wiring harness on these transmissions. If the harness is cracked or the enable solenoid has failed, buy a kit that includes the harness.
No. All five solenoids are reachable with the pan and filter off. The valve body only comes down if you are also checking bores or checkballs.
Dexron VI ATF, which GM specifies for the 4L60E and 4L65E and which is backward compatible with earlier Dexron III units.
Clear codes and reset transmission adapts with a scan tool, then drive it through several light and moderate throttle shifts so the computer can relearn shift times.
