Replaces all six solenoids plus the internal wiring harness on GM 4T65E transaxles, curing hard shifts, no 4th and TCC lockup codes.
Intermittent shift codes that come and go, a converter that drops lockup over bumps, or a 4T65E that suddenly holds one gear and then behaves normally after a restart often point to wiring as much as to the solenoids themselves. This six-piece kit replaces both at once. It is listed for 2003-2011 4T65E transaxles in the Chevrolet Impala, Monte Carlo and Malibu, Pontiac Grand Prix, Buick LaCrosse and Lucerne, and the Volvo models that shared the unit. The photos show the complete internal wiring harness with its round case connector, two coil-type shift solenoids, two spool-type pressure solenoids for line pressure and converter clutch control, and the pressure switch plate.
Inside the transaxle, the harness runs from the case pass-through connector across the valve body to each solenoid and the switch plate. It lives in hot fluid for its entire life, is held down by plastic clips, and flexes slightly with every engine movement. Over time the insulation hardens and the clips wear into the wires. Transmission Digest documented exactly this on 2006-2007 4T65E cars, where harness chafe at a retaining clip set converter clutch circuit codes with nothing wrong mechanically. Replacing solenoids alone on a car like that leaves the real fault in place, which is why this kit pairs the two.
With a scan tool, note which codes are present and whether they return immediately or only intermittently. Measure each solenoid circuit at the outside case connector, then wiggle the harness while watching the reading; a value that jumps around means wiring, not a coil. If every circuit is steady and the car still has P1811, worn clutch packs or a worn AFL valve bore may be the cause, which our 4T65E pressure control solenoid guide explains. For a broader look at what fails on this unit, see the 4T65E common problems guide.
The listing covers 2003-2011 4T65E applications and cross-references these OE numbers: G4T65E, 24237264, 10478124, 24219819, 24212690, 24227792, 8683187, 10478146, 24203699, 24203267, 24209121, 24212327, 24214974 and 24227747, plus aftermarket TCS32, TCS44, TCS77, TCS342, TKS10, TKS23, SL10020 and 2N1204. GM changed connectors during the run, so match a number from your old parts to this list or send your year and VIN. If your harness is in good shape and you only want the solenoids, the 2003-2011 solenoid kit is the alternative, and early cars use the 1997-2002 kit. All 4T65E parts are in the 4T65E collection.
Drain the fluid, remove the side cover, and photograph the harness routing and every clip position before you unplug anything. Transfer the solenoids one location at a time, use new O-rings, and route the new harness exactly as the original, making sure no wire sits under a clip edge or against the case. Seat the case connector fully from inside and check its O-ring. Refill with Dexron VI, check the level hot, clear codes and relearn the shift adapts. If the valve body is worn, a remanufactured 2003-up valve body can go in at the same time.
| Transmission | GM 4T65E four-speed transaxle |
| Vehicles | 2003-2011 Chevrolet Malibu, Impala, Monte Carlo; Pontiac Grand Prix; Buick LaCrosse, Lucerne; Oldsmobile Intrigue; Volvo 4T65E applications |
| Includes | 6 solenoids and internal wiring harness |
| OE cross-reference | G4T65E, 24237264, 10478124, 24219819, 24212690, 24227792, 8683187, 10478146, 24203699, 24203267, 24209121, 24212327, 24214974, 24227747 |
| Aftermarket cross-reference | TCS32, TCS44, TCS77, TCS342, TKS10, TKS23, SL10020, 2N1204 |
| Codes addressed | P0751, P0753, P0758, P0748, P1811 |
| Shipping weight | 1.38 lb |
| Condition | New aftermarket, direct replacement |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The photos show the internal wiring harness, two shift solenoids, two pressure solenoids (line pressure and converter clutch) and the pressure switch plate.
It is listed for 2003-2011 4T65E transaxles. Match one of the OE numbers on this page to your old parts, or send your year and VIN for a check.
The internal harness sits in hot fluid and can chafe at its retaining clips, which sets solenoid circuit codes on its own. Replacing both removes the two most common electrical failure points in one job.
Only if a solenoid or wiring fault is the cause. P1811 is also caused by worn 2nd and 3rd clutch packs or a worn AFL valve bore.
Dexron VI automatic transmission fluid, the fluid GM specifies for 4T65E applications of this era. Check the level with the transaxle hot.
