Shop All Transmission Parts →
A 4L60E master solenoid kit replaces all of the electrical valves that tell the valve body when to shift, how much line pressure to make, and when to lock the converter. Buying them as a kit costs little more than two or three individual solenoids, and on a high-mileage truck the ones that have not failed yet are usually close behind.
What Each Solenoid Does (and the Codes It Sets)
| Solenoid | Job | Common Codes |
|---|---|---|
| Shift Solenoid A (1-2) | With B, selects the gear | P0751, P0753 |
| Shift Solenoid B (2-3) | With A, selects the gear | P0756, P0758 |
| Pressure Control (EPC) | Sets line pressure and shift firmness | P0748, harsh or soft shifts |
| 3-2 Control | Times the 3-2 downshift | P0785, flare or bang on 3-2 |
| TCC / TCC PWM | Applies the converter clutch | P0741, P0742, P1860 |
Shift solenoids A and B are the same part on most years, so a kit usually includes two identical shift solenoids. Some kits also include the pressure switch manifold (PSM), which is a switch assembly that reports the selected range. A failing PSM causes wrong-gear starts and erratic shifting that is easy to blame on a solenoid.
1993-2002 vs 2003-Up: Why Kits Are Split
GM changed the internal harness and several solenoid connectors for 2003. The shift solenoids themselves carry over, but the EPC, TCC, and harness parts differ, which is why kits are sold in two ranges. Buying the wrong range usually means a connector that does not fit, so check the model year on the truck, not the transmission tag alone. If the transmission has been swapped in the past, compare the old solenoids to the listing photos before you install.
| Kit Type | What You Get | Best For |
|---|---|---|
| 5-piece master kit | Shift A, shift B, EPC, 3-2, TCC or TCC PWM | Solenoid codes with a good harness |
| Kit with internal harness | Solenoids plus the internal wiring harness (with TCC solenoid) | Brittle connectors, intermittent codes, over 150k miles |
| Kit with filter and pan gasket | Solenoids, harness, filter, gasket | One-trip service, the whole pan-off job in one box |
Test Before You Buy
A digital multimeter will tell you a lot. With the connector unplugged at the case or at the solenoid, measure resistance at room temperature:
- Shift solenoids A and B: roughly 20 to 30 ohms. Open circuit or near zero means the solenoid is dead.
- EPC solenoid: roughly 3.5 to 4.6 ohms. Out of range often shows up as harsh shifts and P0748.
- Check each terminal to the case. Any continuity to ground means a shorted solenoid or a chafed harness.
A solenoid that measures correctly can still stick mechanically from debris, so a clean resistance reading with a stubborn performance code (P0751 or P0756) still points to replacement. If new solenoids do not fix a performance code, the problem is usually valve body wear, not electrical; see the 4L60E valve body buyer's guide. A good meter for this job is covered in best multimeter for solenoid testing.
Install Tips
- Lightly oil the new O-rings with clean ATF before pushing solenoids into their bores. A pinched O-ring leaks pressure and sets the same code you were trying to fix.
- The EPC and shift solenoids are held by retainers or bolts on the valve body. Note the orientation of each before removal.
- Install a new filter and seal. The filter seal stays in the pump bore when the old filter comes out, so pull it out every time.
- Clear codes and adaptive values with a scan tool and drive through every gear to let the computer relearn.
Step-by-step removal is in our 4L60E shift solenoid replacement guide and the TCC solenoid guide.
4L60E Solenoid Kits In Stock
Master solenoid kits for 1993-2002 and 2003-up, with or without the internal harness, filter, and pan gasket.
2003-Up 5-Piece Kit → 1993-2002 5-Piece Kit Kit With Harness and FilterFAQ
Can I replace 4L60E solenoids without removing the transmission?
Yes. All of the solenoids are on the valve body behind the pan and filter. The TCC solenoid is on the pump side and comes out with the internal harness.
Should I replace just the solenoid that set the code?
On a low-mileage truck you can. On a high-mileage truck the pan is already off, and the kit costs little more than two individual solenoids, so most shops replace them all.
Why did the code come back after new solenoids?
Performance codes that return usually mean worn valve body bores or low pressure, not a bad solenoid. Electrical codes that return usually mean a harness or connector fault.
Will a 1993-2002 kit fit a 2004 truck?
No. The 2003-up trucks use different connectors and harness parts. Buy the kit for your model year range.
What does a 4L60E EPC solenoid failure feel like?
Very harsh shifts or soft slipping shifts, often with P0748. The EPC controls line pressure, so shift feel changes on every gear.