Five-solenoid set for 1996-2002 GM 4L60E and 4L65E: 1-2 and 2-3 shift solenoids, 3-2 downshift, EPC and TCC PWM, replaced in one pan-drop.
A 1996-2002 4L60E that takes off in second, sits in one gear, shudders at 40-50 mph or slips through soft upshifts is very often a solenoid problem, and on a high-mileage unit those solenoids tend to wear out together. This five-piece kit replaces all of them in one pan drop: the A (1-2) and B (2-3) shift solenoids, the 3-2 downshift solenoid, the EPC pressure control solenoid and the TCC PWM solenoid. It is listed for the 4L60E and early 4L65E in Chevrolet and GMC trucks and vans, Tahoe, Suburban, Avalanche, Astro, Safari, Camaro, Firebird and Escalade, plus the 1996 Roadmaster, Caprice and Fleetwood. At $81.99 it covers the full electrical side of the valve body for these years.
Every gear in this transmission comes from two on/off solenoids. The PCM energizes both for first, B alone for second, neither for third and A alone for fourth. When the A or B circuit fails, the result is predictable from that table: a dead A solenoid that never turns on leaves the truck starting in second, and losing both drops it into third. The EPC solenoid is the pressure dial; the PCM raises or lowers its current to set line pressure for load and throttle. The TCC PWM solenoid pulses the converter clutch on gradually. When it sticks or leaks, lockup arrives harshly, slips, or chatters, which is the familiar 40-50 mph shudder on these trucks. The 3-2 downshift solenoid manages the third-to-second timing.
Do not assume the solenoids are guilty just because the truck starts in second. Transmission Digest documented a 1993 C1500 with exactly that complaint where new solenoids and then a complete valve body did not fix it, because the real fault was hydraulic. ATRA has also traced P0753, P0758, P0785 and no-shift complaints to a single badly crimped terminal in the solenoid circuit. Check the fuse feed, case connector and solenoid resistance first, then confirm with a scan tool that commanded gear and actual ratio disagree. If the electrical checks pass and the shift is still wrong, Sonnax recommends vacuum testing the valve body bores instead of guessing. Our shift solenoid A and B code guide and the TCC solenoid diagnosis guide cover each test step.
The listed range is 1996-2002 4L60E and 4L65E. The 2003-up design changed both the EPC and the internal harness, so a truck built in 2003 needs a different set even though the transmission name is the same. Match the connectors and part numbers on your old solenoids, or send us your year and VIN. If you have a later unit, see the 2003-2007 solenoid kit. Every 4L60E part we stock is listed on the 4L60E collection page.
Drain and drop the pan, pull the filter and unplug the internal harness at each solenoid. Remove the retaining clips and bolts. Do not transfer anything from the old parts. Lube each new O-ring with ATF and seat every solenoid fully so the O-ring is not rolled or cut, then torque the EPC bracket bolt to spec. Install a new filter, use the solenoid and filter service kit if you also want the filter and gasket included, and refill with Dexron VI. Clear codes and road test through all four gears, lockup and a coast-down. If a worn valve body is confirmed, a Sonnax-updated valve body assembly corrects the bore wear that new solenoids cannot.
| Fits | GM 4L60E, 4L65E (1996-2002) |
| Includes | A shift, B shift, 3-2 downshift, EPC, TCC PWM solenoids |
| Quantity | 5 solenoids |
| Weight | 1 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
In the 4L60E shift table, first gear needs shift solenoid A energized. If A or its circuit fails, the truck starts in second. A hydraulic fault in the valve body can cause the same complaint, so confirm the electrical side before buying.
It will if the solenoid is sticking. Shudder can also come from worn converter clutch material, burnt fluid or valve body bore wear, so change the fluid and check for TCC slip codes as well.
Yes, the 1996 Roadmaster, Caprice and Fleetwood are in the listed fitment. As with any 4L60E, compare connectors and part numbers on your old solenoids or send us the VIN.
No. 2003-up units use a different EPC solenoid and harness. This kit is for 1996-2002 builds only.
A new filter and pan gasket every time, and the internal harness if its insulation is cracked or a connector lock is broken.
