4T65E Tcc Solenoid 2003, new and ready to install. Fits the 4T65E. Ships fast from the USA.
A 2003-or-later Chevrolet Impala or Monte Carlo, Pontiac Grand Prix, Buick LeSabre, Century or Lucerne that shudders at highway cruise, revs higher than it should at 60 mph, throws a converter clutch code, or flares between gears is a classic 4T65E electrical complaint. Although this listing is filed under the TCC solenoid, what you actually receive is a brand-new master solenoid set for the 2003-on 4T65E: the converter clutch (lockup) solenoid, the pressure control (EPC) solenoid, both shift solenoids and a new pressure switch manifold. The solenoids are AC-Delco units, with GM Genuine pieces substituted when needed, so you are replacing every electrical control on the valve body with factory-grade parts in a single side-cover job.
On this transaxle the engine computer locks the torque converter at steady cruise by pulsing the TCC solenoid, which feeds the converter clutch apply circuit. When the solenoid sticks, leaks internally or loses its screen, apply pressure wanders and the clutch slips instead of locking. The computer watches engine speed against turbine speed, sees slip, and stores a code. The other three solenoids share the same oil source: Sonnax notes that the actuator feed limit (AFL) valve in the channel plate supplies the EPC and shift solenoids at up to 115 psi, so a tired solenoid set and a worn AFL bore can look identical from the driver's seat. That is the reason a full set makes more sense here than a single lockup solenoid.
Scan for codes, then log TCC slip speed and commanded versus actual EPC current on a drive. A circuit code is not always the solenoid: Transmission Digest documented 2006-07 4T65E cars storing P0742, P2761 and P2764 because the internal wire harness chafed through at a retaining clip, so measure resistance at the case connector and again at each solenoid before blaming the coils. A slip code with a healthy circuit can be a worn AFL bore, a converter clutch, or a 3-4 clutch problem, which our 4T65E 3-4 clutch failure guide covers. For pressure-related codes, work through the EPC solenoid diagnosis guide first.
This set is listed for 2003-on 4T65E transaxles in GM cars, and the listing also names Volvo applications that use the 4T65E. GM changed the valve body and solenoid hardware for the 2003 model year, so this is not the right set for a 1997-2002 car; those owners should look at the 1997-2002 4T65E TCC solenoid listing. Because the 4T65E ran through 2011 with running changes, compare the connector shapes and the pressure switch manifold in the photo to your valve body, or send us your year and VIN and we will confirm before it ships. Every 4T65E part we carry is in the 4T65E parts collection.
Disconnect the battery and drain the fluid before pulling the side cover. Unplug the internal harness, remove each solenoid retainer, and lift the pressure switch manifold off its seals. Check the TCC regulator and AFL valve bores while they are exposed; if the bores are scored, a new 2003 4T65E valve body fixes the hydraulic side the solenoids cannot. Install every solenoid with its new O-ring lubricated in clean ATF, torque the bolts evenly, and inspect the harness for chafe at the clips. Refill with Dexron VI; GM lists roughly 7.4 quarts total capacity for the Impala, though a side-cover job takes less. Clear the codes, reset adapts if your scan tool allows it, and drive through several lockup cycles at steady highway speed to confirm the shudder is gone. If the unit is coming apart anyway, the 2003 4T65E banner rebuild kit covers the seals and frictions.
| Fits | 4T65E 2003 |
| Part type | Tcc Solenoid |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is a full new master set for the 2003-on 4T65E: one TCC (lockup) solenoid, one EPC pressure control solenoid, two shift solenoids and one pressure switch manifold. The solenoids are AC-Delco, with GM Genuine parts substituted when necessary.
No. This set is for 2003 and later 4T65E transaxles. GM revised the valve body hardware for 2003, so 1997-2002 cars need the earlier set. If you are unsure which you have, send us the year and VIN.
If the shudder comes from a sticking or leaking TCC solenoid, yes. If the converter clutch lining is burnt or the AFL valve bore is worn, solenoids alone will not cure it. Check slip speed and line pressure first, and change the fluid, since degraded fluid also causes shudder.
Dexron VI. GM specifies it for the 4T65E, and total capacity on the Impala is about 7.4 quarts, though replacing solenoids through the side cover only drains part of that.
Clear the codes and reset the shift adapts with a capable scan tool if possible. Otherwise the computer relearns over several drive cycles; expect shifts to settle within a few days of normal driving.
Inspect it carefully. Later 4T65E harnesses are known to chafe at a retaining clip and set TCC circuit codes, so if you find worn insulation, replace the harness while the side cover is off.
