Replaces every solenoid, the pressure switch manifold and the internal TCC harness on 1993-2002 GM 4L60E units in one pan-off job.
If you own a 1993-2002 Chevrolet or GMC truck, a Tahoe, Suburban, Yukon, Blazer, or an F-body Camaro, Firebird or Corvette with the 4L60E, and the scan tool is showing P0753, P0758, P0740 or P1860, or the truck has started holding second gear, this is the kit that covers the whole early electrical package in one pan drop. Along with every solenoid it includes the pressure switch manifold and the TCC solenoid already mounted on its internal harness, which are the two pieces most single-solenoid fixes leave behind.
The early 4L60E is a two-solenoid shift design. Shift solenoid A (the 1-2 solenoid) and shift solenoid B (the 2-3 solenoid) are switched on and off in combination, and that pattern alone decides which gear the valve body hydraulically selects. Feed for those solenoids, and for the EPC, TCC and 3-2 solenoids, comes from the AFL valve, which Sonnax describes as limiting that circuit to about 115 psi. The EPC solenoid then varies line pressure for shift firmness, the PWM solenoid feathers converter clutch apply, the 3-2 solenoid manages the 3-2 downshift, and the TCC solenoid on the harness turns lockup on and off.
The pressure switch manifold is the part people forget. It is a stack of small diaphragm switches bolted to the valve body that tells the computer which range the manual valve is in. When those diaphragms age, the computer can believe the selector is somewhere it is not, and the shift complaint that follows looks exactly like a solenoid fault.
Start at the case connector, not the solenoids. ATRA Technical Bulletin 583 documents a poor crimp on the circuit 1020 terminal setting any combination of P0740, P0753, P0758, P0785 and P1860 on these units, so wiggle-test and inspect the external connector first. Then measure each circuit through the case connector against the pin map and ohm values in ATRA Bulletin 269. A coil that reads open or far out of range confirms the electrical side. If everything measures good and the truck still starts in second, read the Transmission Digest 1993 C1500 case listed below: new solenoids and even a complete valve body did not fix that one. Our guide to 4L60E codes P0753 and P0758 walks through the test sequence, and the P0740 TCC solenoid guide covers the lockup side.
This kit is listed for 1993 through 2002 GM 4L60E transmissions, including the 4L65E and 4L70E variants built in that window. It does not fit 2003 and later units, which changed the harness and connector layout and need a different kit such as our 2003-2007 4L60E solenoid kit. Very early units can differ in small details, so compare the pressure switch manifold and the harness connectors on your valve body to the product photos, or send us your year and VIN before ordering. You can see every early and late 4L60E part we carry on the 4L60E collection page.
The kit carries a 6-month warranty. If the fluid is burnt or the pan is full of clutch material, solenoids will not cure it; plan on a rebuild such as our 1993-2003 4L60E Banner rebuild kit instead.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is built for 1993-2002 4L60E units. GM changed the harness and connector layout for 2003, so a 2003 or later truck needs one of our 2003-up solenoid kits. Send your year and VIN if you are unsure.
It reports the manual valve position to the computer. Worn diaphragms send a false range signal that causes erratic shifts and can look like a shift solenoid failure, so replacing it during the same pan drop rules it out.
Sometimes. A weak TCC or PWM solenoid can cause it, but on this family valve body bore wear is a common cause of P0741. If the solenoids test good, vacuum test the valve body before buying parts.
The listing covers 4L60E, 4L65E and 4L70E units built 1993 through 2002. Match your harness connectors and pressure switch to the product photos before ordering.
Refill with Dexron VI and check the level with the transmission hot. The kit carries a 6-month warranty.
Clear the codes and drive the truck through every gear and into lockup several times. Shift quality settles as the computer adapts to the new solenoids.
