Replacement solenoid set for the 4L60E behind the 5.3L V8 in 2004-2010 Silverado, Sierra, Tahoe, Yukon XL and Express trucks and vans.
The 5.3L V8 behind a 4L60E is one of the most common drivetrains GM built in the mid-2000s, and by now plenty of those Silverado, Sierra, Tahoe, Yukon XL and Express owners are chasing the same thing: a check engine light with shift solenoid or converter clutch codes, a truck that suddenly starts in second, or shifts that slam or slip. This remanufactured, tested solenoid set (part number CXT-I12D0330) is matched to the 2004-2010 5.3L applications, so you can renew the valve body electrics in one service instead of dropping the pan for each solenoid as it fails.
In these trucks the engine computer runs the transmission directly. It switches the A and B shift solenoids in a fixed on/off pattern to select each gear, varies the pressure control solenoid to set line pressure for the torque the 5.3L is making, and modulates the converter clutch solenoid for lockup. The ATRA GEARS solenoid chart shows the 4L60E pattern: both shift solenoids on in first, A off and B on in second, both off in third, and A on with B off in fourth. That last point matters for diagnosis. When the computer sees an electrical fault it shuts the solenoids off, and with both off the hydraulics default to a fixed gear, which is why a failing set often shows up as a truck that leaves from a stop in a high gear.
A 5.3L truck that tows, carries a load, or idles in traffic as a work van cooks its fluid harder than a light-duty car. Heat is what wears solenoid seats and hardens O-rings, so these units tend to lose several solenoids at about the same mileage.
Pull the codes and note whether they are circuit codes or performance codes. Several solenoid circuit codes at once usually point upstream of the solenoids. ATRA Technical Bulletin 1244 names loss of voltage on the solenoid power supply as the most likely cause of limp mode with these codes, and a worn ignition switch as a common culprit. With the key on, the reading at the transmission fuse should match battery voltage; a drop of half a volt or more is suspect. Then check the case connector for oil wicking and bent pins. If the wiring is sound, measure the solenoids and compare with the specs in our shift solenoid A and B code guide. For harsh or soft shifts with P0748, read the EPC solenoid guide. If the electrics check out and the complaint remains, Sonnax recommends vacuum testing the valve body, since bore wear is common in this family and new solenoids will not cure it.
Listed for the 5.3L V8 in the Chevrolet Express 1500 2007-2010, Silverado 1500 2004-2008, GMC Sierra 1500 2005-2010, Chevrolet Tahoe 2007-2009, GMC Yukon 2007, GMC Canyon 2007-2010 and GMC Yukon XL 1500 2004-2008. Two honest cautions. First, GM began putting the six-speed 6L80 behind the 5.3L in some of these trucks late in this run, so on a 2008-2010 vehicle check the RPO codes on the glovebox or door label: M30 means 4L60E. Second, the V8 Canyon did not arrive for every model year listed, so confirm your engine. If in doubt, send us your year and VIN before ordering. Browse other year ranges on our 4L60E parts page.
For a truck that tows, add an auxiliary transmission cooler to keep fluid temperature down and protect the new solenoids. If you are already in the case, a 4th gear super hold servo kit addresses another common weak point of the 4L60E behind a V8.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Look at the RPO code label in the glovebox or on the driver door. M30 is the 4L60E. Later 5.3L trucks may have the six-speed instead, and this kit will not fit that transmission.
It will if the cause is a failed solenoid. If the stuck gear comes from a harness, connector or power-feed fault, the new solenoids will act the same way, so check the transmission fuse voltage, the wiring and the case connector first.
Yes. The solenoids are on the valve body under the pan. You drop the pan and filter, unplug the harness and replace them from below with the transmission in the truck.
Dexron VI. Refill after the job and set the level with the fluid hot and the engine running.
Yes. The pan is already off and the old filter holds debris that can reach the new solenoids. Use a new filter and pan gasket.
Shifts may feel firmer or softer for the first few drives while the computer relearns pressure adapts for the new pressure control solenoid. Drive normally through several warm cycles before judging the result.
