Genuine GM EPC pressure control solenoid (PN 24248893) that regulates line pressure on 4L60E, 4L65E and 4L80E automatics; fixes harsh or slipping shifts.
GM part number 24248893 is the genuine GM / ACDelco electronic pressure control solenoid used across the 4L60E, 4L65E, 4L70E and 4L80E automatics. If you are chasing P0748, a harsh bang into every gear, or shifts that have gone soft and slippery in a Silverado, Sierra, Tahoe, Yukon, Suburban, Express, Savana or a performance build, this is the OE-calibrated part to start with. It carries a 12 month / 12,000 mile parts warranty and ships from the USA.
GM and its suppliers call this design a force motor. Inside is a coil and a spool valve: the computer sends it a pulse-width-modulated current, and the spool bleeds off control oil in proportion to that current. That control oil goes to the pressure regulator side of the pump, so it sets line pressure for the whole transmission. In the 4L60E family the relationship is inverse, so the solenoid is pulling the most current at idle when pressure should be low and almost none at full throttle when pressure needs to be highest. A solenoid that sticks, leaks internally or loses coil strength throws that balance off in every range at once, which is why EPC failures feel like a whole-transmission problem rather than one bad shift. The 4L80E uses the same basic force motor principle on its own valve body, which is why one part number serves both families.
Test it out of the circuit first. The force motor installation sheet from Teckpak-Fitzall lists 3.5 to 4.66 ohms measured at the solenoid terminals. Then check the system in operation: the same sheet gives the 4L60E line pressure range as about 50-189 psi in Drive, Park or Neutral and 67-324 psi in Reverse, idle to wide-open throttle. A solenoid that measures correctly while pressure stays low usually means a worn pressure regulator or boost valve, and Sonnax notes that a worn regulator often shows as 50-100 psi low in Reverse. Our line pressure testing guide shows where to connect the gauge, and the P0748 guide covers the wiring checks.
The listing lists the 4L60E, 4L65E, 4L70E and 4L80E. The solenoid uses a 2-terminal connector, measures about 4.1 x 2.1 x 2.1 inches and weighs 5.76 ounces. Match the part number on your old solenoid, or compare the connector and body shape, before you install it. If you are unsure whether your truck has a 4L60E family unit or a 4L80E, check the RPO code in the glove box or send us your year and VIN. For year-specific 4L60E versions, see the 1997-2005 EPC solenoid, or browse everything on the 4L60E parts page.
| Part number | 24248893 (GM Genuine / ACDelco) |
| Type | Electronic pressure control (EPC) force-motor solenoid |
| Fits | GM 4L60E, 4L65E, 4L70E, 4L80E automatics |
| Function | Regulates line pressure via the pressure regulator valve |
| Connector | 2-terminal, hydraulic/flare port |
| Dimensions | 4.1 x 2.1 x 2.1 in, 5.76 oz |
| Warranty | 12 months / 12,000 miles, parts only |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The listing covers both, along with the 4L65E and 4L70E. Confirm the part number or compare the connector and body with your old solenoid before installing.
The force motor installation sheet lists 3.5 to 4.66 ohms at the solenoid terminals. Readings through the case connector can be slightly higher because of the harness.
Only if the solenoid is the cause. P1811 means the computer has hit its adaptive limit trying to correct long shifts, which can also come from worn clutches or a worn pressure regulator. Test line pressure first.
Yes. Clear codes and reset the transmission adaptive values with a scan tool, otherwise the computer may keep compensating for the old solenoid.
12 months / 12,000 miles, parts only.
