Replaces every electrical control in a GM 4L60E or 4L65E: shift A/B, 3-2, EPC, PWM, TCC, pressure switch and internal harness, plus filter and pan gasket.
When a 1993-2002 Silverado, Sierra, Tahoe, Yukon, S10, Blazer or Camaro starts stacking up transmission codes, such as a shift solenoid code one week and a pressure control or converter slip code the next, the electrical side of the valve body is usually aging as a unit. This master kit replaces all of it at once on the GM 4L60E and 4L65E (RPO M30 and M32): every solenoid, the pressure manifold switch, the internal wiring harness, plus a new pan filter and pan gasket, so one pan drop finishes the job.
The 4L60E's computer does not move clutches directly. It switches solenoids, and the solenoids steer fluid to the shift valves. Shift solenoid A (1-2 and 3-4) and shift solenoid B (2-3) work as a pair: ATRA's solenoid application chart lists both on in first, A off and B on in second, both off in third, and A on with B off in fourth. The EPC force motor sets line pressure, the TCC on/off and PWM solenoids apply the converter clutch, and the 3-2 solenoid manages downshift timing. The pressure manifold switch reports which range the manual valve is in, and the internal harness connects all of it to the case connector. That harness sits in hot fluid for its whole life; once its insulation goes brittle, a solenoid can test fine on the bench and still lose its signal in the pan.
Start at the case connector with an ohmmeter and check each circuit against spec, then wiggle the harness while watching the reading. ATRA bulletin 583 traces many multi-code 4L60E failures to a bad terminal crimp on the shared feed circuit, which is one reason this kit includes the harness rather than just the solenoids. Our 4L60E shift solenoid symptoms and testing guide covers the pin-by-pin checks, and the shift solenoid A and B code guide explains the circuit codes. Be aware that a Transmission Digest case on a 1993 C1500 shows solenoids and even a complete valve body replaced without curing a second-gear start, so if your electrical tests pass, look at the hydraulic side before spending money.
This kit fits 1993-2002 GM 4L60E and 4L65E transmissions and crosses to OE numbers including 24227747, 24215111, 24230298, 10478120, 8677314, 8683187, 24208576 and 24219581. The 2003-and-later valve body uses different solenoid and harness connections, so a 2003 or newer truck needs a late-style kit. Within 1993-2002 there were running changes, so compare the numbers on your old parts with the list above or send us your year and VIN to confirm. More options for your truck are on the 4L60E transmission parts page.
The solenoids are remanufactured and bench tested, so a thin film of test oil on them is normal. Drain and drop the pan, remove the filter, unplug the harness from each component and from the case connector, then remove the solenoid retainers and bolts. Swap each part one for one in its original location, with ATF on every O-ring, and route the new harness exactly as the old one ran so it cannot rub on the valve body or pan. If you lower the valve body, keep the checkballs and bolt lengths in order and torque the bolts evenly. Install the new filter with its seal fully seated in the pump, fit the new pan gasket, refill with Dexron VI, clear codes and road test. If the old fluid came out black with clutch material in the pan, the solenoids were not the whole story; a 4L60E master rebuild kit or a 4L60E 3-4 clutch pack is the next step.
| Fits | GM 4L60E / 4L65E (M30, M32), 1993-2002 |
| Includes | Shift A, shift B, 3-2 downshift, EPC, PWM, TCC solenoids; pressure manifold switch; internal harness; filter; pan gasket |
| Condition | Remanufactured, bench tested |
| Replaces | 24227747, 24215111, 24230298, 10478120, 8677314, 8683187, 24208576, 24219581 |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is built for 1993-2002 4L60E and 4L65E units. GM changed the valve body, solenoids and harness for 2003, so later trucks need a 2003-up kit. Send us your year and VIN if you are not sure.
They are remanufactured and bench tested with fluid running through them, so a light oil film from testing is normal and does not mean they are used or leaking.
On a high-mileage unit, usually yes. The solenoids and harness share the same heat cycles, and replacing them together avoids dropping the pan again when the next one fails. This kit also includes the filter and pan gasket you would buy anyway.
No. The solenoids, pressure switch and internal harness are all reachable with the pan and filter off. Some solenoids are easier to reach if the valve body is lowered, which can be done in the vehicle.
Use Dexron VI. A pan drop with a new filter typically takes around 5 quarts; refill, run the engine, cycle through the gears and check the level hot on the dipstick before topping off.
