Two-piece 1-2 and 2-3 shift solenoid set (GM part 24230298) for the 4L60E, 4L65E, and 4L70E, the fix for shift codes P0753 and P0758 on GM trucks and SUVs.
A GM truck that takes off in second, never leaves third, or skips straight from first to third is usually telling you something about its shift solenoids, and a check engine light with P0753 or P0758 confirms which circuit the PCM is unhappy with. This set contains both on/off shift solenoids for the 4L60E, 4L65E and 4L70E: the 1-2 solenoid (A) and the 2-3 solenoid (B). It replaces GM 24230298 and interchanges with 10478120, 10478131, 24236521, 214-1893, TCS17 and K77945, so you get both positions in one box for $30.99 instead of chasing a second part after the first one is in.
The 4L60E is what ATRA calls a Type 1 two-solenoid transmission. The PCM never moves the shift valves directly; it switches A and B on and off in a fixed pattern and line pressure does the rest. First gear is A on and B on. Second is A off, B on. Third is both off. Fourth is A on, B off. Two things fall out of that table. First, if the solenoids lose power together the transmission defaults to third, which is the classic limp-mode complaint. Second, a single dead solenoid produces a very specific pattern: a B solenoid stuck off removes first and second, while an A solenoid that will not switch upsets the 1-2 and 3-4 shifts. Writing down which gears you actually get on a road test is often enough to point at the right solenoid before the pan comes off.
Unplug the case connector and measure across the solenoid pins. ATRA's resistance chart puts solenoid A at pins E and A and solenoid B at pins E and B, each 20 to 40 ohms. Transmission Digest documented a 2001 S-10 with a stored P0758 where the solenoid measured within spec and still responded too slowly, so a passing ohm reading does not fully clear a solenoid that has been in hot fluid for years. If both codes set together, check the shared power feed first; ATRA bulletin 583 traces stuck-in-third and multiple codes to a poor crimp on circuit 1020. Our P0753 and P0758 shift solenoid guide covers the test steps, and the 4L60E common problems guide helps rule out a stripped sun shell or burned 3-4 pack, which can also take away gears.
Listed for GM 4L60E, 4L65E and 4L70E transmissions from 1993 through 2013. That includes Silverado and Sierra 1500, Tahoe, Yukon, Suburban, Express and Savana vans, Astro and Safari, S10, Blazer, Colorado and Canyon, Escalade, Hummer H2 and H3, Trailblazer and Envoy, plus swap builds running a 4L60E. The solenoids use a 2-pin connection. Hold your old solenoids next to these and compare the body and terminal, or send your year and VIN for a quick check. The rest of the lineup is on the 4L60E collection page.
Drain the fluid, drop the pan and pull the filter. The A and B solenoids are on the valve body and held by metal clips. This kit does not include clips, so remove the originals carefully and keep them. Disconnect each lead, pull the clip, slide the solenoid out straight, and inspect the bore for debris. Wet the O-ring on the new solenoid with ATF so it does not roll, seat it fully, refit the clip and reconnect. Do one solenoid at a time so A and B never trade places. Fit a new filter and gasket, refill with Dexron VI, clear the codes and drive through all four gears. While you are in there, the GM 24212327 3-2 downshift solenoid is the next most common failure on the same valve body. If the bores are worn or the gear complaint returns, a 1999-2002 4L60E valve body is the next step for those years.
| Fits | GM 4L60E, 4L65E, 4L70E transmissions, 1993-2013 |
| Function | 1-2 shift solenoid (A) and 2-3 shift solenoid (B), normally-open on/off |
| Replaces | 24230298, 10478120, 10478131, 24236521, 214-1893, TCS17, K77945 |
| Fixes codes | P0753 (solenoid A electrical), P0758 (solenoid B electrical) |
| Connector | 2-pin |
| Contents | 2 solenoids (clips not included, reuse originals) |
| Ships | From the USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
A is the 1-2 shift solenoid and B is the 2-3 shift solenoid. On the case connector, ATRA lists A at pins E and A and B at pins E and B, each measuring 20 to 40 ohms.
With both shift solenoids off, a 4L60E sits in third. Losing power to both, from a fuse, ignition switch or a bad crimp on circuit 1020, will do it, so check the feed before assuming both solenoids failed.
No. Reuse the metal clips from your original solenoids, so remove them carefully.
Most techs do. Both solenoids have the same mileage and the pan is already off, and this set includes both positions for the price of a single job.
Refill with Dexron VI ATF and install a new filter and pan gasket. Clear the codes afterward and road test all four gears.
