When any one of these two shift solenoids fail, the PCM commands the transmission to operate in LIMP IN MODE and this means that the transmission will run in 2nd gear only (no 1st and no 3rd or 4th).Īlthough there's a lot more to know and learn about the operating theory of the 4L60-E transmission, the above should suffice for our purposes in the article. 4st Gear: Solenoid 1-2: ON Solenoid 2-3: OFF.3st Gear: Solenoid 1-2: OFF Solenoid 2-3: OFF.2st Gear: Solenoid 1-2: OFF Solenoid 2-3: ON.1st Gear: Solenoid 1-2: ON Solenoid 2-3: ON.The PCM (Powertrain Control Module = Fuel Injection Computer) activates and deactivates these two solenoids in a predetermined pattern so that 4 specific gear ratios can be achieved. In the photo above, this solenoid is identified by the letter B. Shift solenoid B = shift solenoid 2-3.In the photo above, this solenoid is identified by the letter A. Shift solenoid A = shift solenoid 1-2.To avoid any confusion with what name is used to identify them:
#4L60E SHIFT SOLENOID REPLACEMENT PROFESSIONAL#
The two that we're concerned with are the 1-2 and 2-3 shift solenoids.ĭepending on the type of scan tool you're using (either a generic scan tool or a professional level technician's scan tool), these two solenoids will be called shift solenoid A and shift solenoid B or 1-2 shift solenoid and 2-3 shift solenoid. The 4L60-E transmissions uses several solenoids and sensors to control/activate its 4 gears. TIP 4: If your transmission is slipping, replacing the shift solenoids, even if they're fried will not solve the slipping issue. Be careful, take all necessary safety precautions. Transmission fluid gets hot and remains hot long after the vehicle has been turned off. TIP 3: Removing the shift solenoids should be done with a completely cooled vehicle. shift solenoid B refers to the shift solenoid 2-3. TIP 2: Shift solenoid A refers to shift solenoid 1-2. This section is a must read to avoid any complications you might have in finishing the job. TIP 1: Before removing the transmission oil pan, read the section: Before You Remove The Trans. You can find this tutorial in Spanish here: Cómo Probar los Solenoides De Cambio A y B (GM 4.3L, 5.0L, 5.7L) (at: ). How Can I Tell If My 4L60-E Transmission is Bad?.
#4L60E SHIFT SOLENOID REPLACEMENT HOW TO#
In case you're wondering how to tell the difference between a bad shift solenoid and internal transmission damage, the following article might be helpful: You do have to take some precautions and in this article I'll show you what to do and not do to diagnose a shift solenoid issue with your vehicle. You'll be surprised just how easy it is to diagnose these shift solenoids when they have failed. In this article, I'll show you how to test the transmission shift solenoids (specifically 1-2 solenoid and 2-3 solenoid) on your GM 4.3L, 5.0L, 5.7L pick up, van, SUV.
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