4L60e, 4L65e, 700r4 Shift Solenoid problems P0752, P0753, P0756, P0757, P0758, P0765, Advise!
Having a issue with your 4L60E series transmission in your truck, van, or car? Do you have a code stored in your OBD2 system such as one of the following p0752, p0753, p0756, p0757, p0758, or p0765? . Maybe you're just having a shifting issue and you think it might be a shift solenoid causing a problem that you are having at hand. I'm going to try to cover a few issues or common problems with a 4l60e/4l65e transmissions.
(Check out the YT vid for this blog too: https://bit.ly/2vBIcRM and video at bottom)
To gain access to the A and B shift solenoids in your transmission you do not need to remove the transmission. Simply drain the oil through the pan using the drain plug on your pan. After all the fluid has drained out go ahead and remove the oil pan from the transmission. With hand off you'll see both the solenoids at the rear of the valve body. In fig. 1 I am pointing at the A Solenoid. Need to buy AcDelco Shift solenoids? buy here: Ebay: https://ebay.to/2MlJmaUAmazon: https://amzn.to/2Mi7MSP
If you're having a shift solenoid issue or have a code that is appearing that has a description pertaining to a shift solenoid issue you should not always just replace the shift solenoid itself. You could also have a few other problems such as a wiring harness gone bad or a valve in the valve body that is feeding the transmission shift solenoid has seized due to debris be in the boar.
Disconnect the wiring harness from the first transmission shift solenoid that you're going to be removing. Before we remove the shift solenoid we should check for continuity at the connection to the shift solenoid using a Power Probe, shown in fig .2. If the transmission is still in the vehicle and the battery is still connected you should have continuity on both prongs in the connection to the solenoid.(Buy Power Probe: Ebay: https://ebay.to/2mCmitn Amazon: https://amzn.to/2mNriLI) You should detect ground on both sides of the connection on the wiring harness. If you do not detect continuity on both prongs at the connection on the wiring harness, you can assume that you're having a wiring harness issue and that the shift solenoid might not be the root cause of your problem.
With the shift solenoid now removed from the transmission, fig 3 shows shift solenoid B being removed.. Test the shift solenoid by using a 9-volt battery with a wire connected to the positive and the negative terminals of the 9-volt battery and then connect those connections to the shift solenoid itself. When the shift solenoid get some 9 volt power from the battery you should hear a clicking sound inside the shift solenoid if you do not hear the clicking sound you can assume that the shift solenoid itself is defective.
When I am in the process of trying to resolve a issue I think a shift solenoid could be a root cause . I always take time to remove the shift valves in the shift valve body that are inside the Boar's for the shift solenoids and clean them. More than one time I have found these valves stuck because debris has got inside the bore where it should not be and the valve can no longer move. . Just cleaning the valves off and returning them to the valve body the way that it removed might get you the few extra miles you need out of the transmission. Fig 4 shows shift valves from the Solenoid B.
When I am in the process of trying to resolve. I think a shift solenoid could be a root cause . I always take time to remove the shift valves in the shift valve body that are inside the Boar's for the shift solenoids. More than one time I have found these valves stuck because debris has got inside the bore where it should not be and the valve can no longer move. . Just cleaning the valves off and returning them to the valve body the way that it removed might get you the few extra miles you need out of the transmission. Forefinger to penetrate the whole a few times just to make sure the sprinklers in and out freely. Fig 5 shows spring in shift valve bore on solenoid A. Fig 6. Me fingering a Tranny.