Every electronic solenoid the 4L80E needs plus the internal wire harness and filter, in one kit for 2004-on GM units.
If your 2004-or-newer 4L80E or 4L85E is hanging in one gear, throwing shift solenoid codes, or no longer locks the converter, the problem is usually in the four solenoids and the internal wire harness that live under the pan. This 7-piece kit replaces that whole group at once for 2004-on GM trucks, vans and SUVs: the EPC pressure control solenoid, the A and B shift solenoids, the TCC solenoid, the internal harness, plus a new filter and pan gasket. Everything is new, not rebuilt. It is the solenoid-only version of our late-model kits, without speed sensors, for trucks where the sensors and speedometer are working fine.
A 4L80E has no throttle cable or vacuum modulator, so the controller tells the hydraulics everything through these parts. The EPC solenoid (crosses to 24248892) receives roughly 0.1 to 1.1 amp from the module; near zero current gives the highest line pressure and full current gives the lowest, which is how the controller firms up shifts under load and softens them at light throttle. The shift solenoids (24230288 and 24230289) are switched on and off in four combinations to select the gears: A on with B off is 1st, both off is 2nd, B alone is 3rd, and both on is 4th. The TCC solenoid (24210864) applies the converter clutch. The 24200161 harness ties all four to the case connector.
Write down which gears you actually have. Because the gear pairs map straight to the A and B solenoid states, the complaint often tells you which solenoid is at fault before any meter comes out; our shift solenoid diagnosis guide has the chart. Then separate circuit codes from ratio codes and measure solenoid resistance at the case connector. If the codes are ratio or performance codes with good resistance readings, the 4L80E common problems guide covers the valve body and actuator feed limit wear that produces the same complaint, because new solenoids cannot make up for a feed circuit that is leaking pressure.
This kit is for 2004 and later GM 4L80E (MT1) and 4L85E (MN8) transmissions, found in GM heavy-duty pickups, Suburban 2500s and the Express and Savana vans. The harness and connector changed at the 2004 split, so a 1991-2003 transmission needs an earlier kit. Compare the numbers on your old harness and EPC solenoid with the cross-references above, or send us the year and VIN and we will confirm fitment. Browse everything else we carry for this unit on the 4L80E collection page.
With the truck level and the fluid drained, remove the pan and filter, unplug the harness at the solenoids and the case connector, and lift the old harness out. Remove the A and B solenoids (one bolt and bracket each), then the EPC and TCC solenoids. Lay the new pieces next to the old ones to check connector shapes before anything goes in. Lubricate each O-ring with clean ATF, seat each solenoid fully, and route the new harness clear of moving parts. Push the new filter into the case bore until its seal is fully seated, then fit the pan with the new gasket and tighten the bolts evenly. Refill with Dexron VI and set the level at operating temperature. Clear codes and road test through every gear and a lockup. If you are firming up a tow rig at the same time, a TransGo SK 4L80E shift kit goes in on the same pan drop, and if the unit is already slipping a master rebuild kit is the real fix.
| Pieces | 7 (EPC, shift A, shift B, TCC, harness, filter) |
| Fits | GM 4L80E / 4L85E, 2004-On |
| Crosses to | OEM 24248892, 24230288, 24230289, 24210864, 24200161 |
| Condition | 100% new, not rebuilt |
| Ships from | USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The EPC pressure control solenoid, the A and B shift solenoids, the TCC solenoid, the internal wire harness, the filter and the pan gasket. It does not include speed sensors; if you need those, look at our 2004-up master kit that adds them.
No. It is the 2004-on version, and the harness and connector are different on 1991-2003 units. Send us your year and VIN if you are not sure which version you have.
You can, but the other solenoids and the harness have the same miles and heat cycles on them. Replacing the set on one pan drop costs less than dropping the pan again when the next one fails.
That is the controller's failsafe. On an electrical fault it commands a limited gear and maximum line pressure to protect the clutches. Read the codes: circuit codes point toward the solenoids, harness or connector.
Use Dexron VI. A pan and filter service only replaces part of the fluid, so refill to the mark and recheck the level hot after a drive.
