Back in the day, I could too, but it's an old state road truck. They get serviced, not like Bubba down the street. Bubba says if you change the filter, it's gonna start slippin' and the fluid is lifetime fluid. You don't have to change that!Coulda swapped out the whole tranny by now....![]()
Similar issue a couple years ago with a 4L60E and it turned out to be the valve body.So out of nowhere my truck decided it would switch to limp mode (my guess). No warning lights and no codes stored in the OBDII system. After searching I found the likely cause was the 1-2 shift solenoid, so I dropped the pan and swapped 1-2 and 3-4 solenoids and filter, buttoned up, and refilled with fresh fluid. Test drive revealed no change. I'll try to reset the computer by removing the ground cable for 30 minutes. If that doesn't do it, I'm going to unplug the harness from the trans and try to diagnose and clean the connections. Any suggestions?
Also are you sure it’s a 4L80E? 1998 should be a 4L60E.So out of nowhere my truck decided it would switch to limp mode (my guess). No warning lights and no codes stored in the OBDII system. After searching I found the likely cause was the 1-2 shift solenoid, so I dropped the pan and swapped 1-2 and 3-4 solenoids and filter, buttoned up, and refilled with fresh fluid. Test drive revealed no change. I'll try to reset the computer by removing the ground cable for 30 minutes. If that doesn't do it, I'm going to unplug the harness from the trans and try to diagnose and clean the connections. Any suggestions?
Yes, positive. I deciphered the code label. It's a C2500 with a 350, 4l80e, 3.73 posi, and semi-floating rear axle and 8 lugs.Also are you sure it’s a 4L80E? 1998 should be a 4L60E.
The new solenoid looks more like the original equipment with no cheesy pigtail and is made in USA, however, the fluid port is missing a strainer screen. I tried to extract the screen from the original, but it appears to be molded into the plastic. My parts guy told me over the phone that the inner packaging was opened, but it didn't appear to have been installed/returned. I guess along the line it was returned to the store and not written off as defective for missing the screen.And, that didn't change a thing. The connector on the Echlin solenoid was too basic and universal for my liking. The pins were actual pins like a circuit board connection for low voltage. I know it's just a switch, but the original was much beefier. It's like comparing a 20awg to a 28awg wire. Not a huge difference unless you're dealing with resistance in already undersized wiring. Anyway, re-ordered another aftermarket solenoid with bigger contacts...
That's the one. I shopped locally, because I has too impatient to wait for delivery.What part number are you using for getting a replacement? A quick search indicates that an OEM number would be 24230288. Is this what you are looking for - https://www.rockauto.com/en/moreinfo.php?pk=452556
The Powertrain Control Module (PCM) controls the solenoid by providing the ground path. When the Powertrain Control Module (PCM) detects a continuous open, short to ground or short to power in the 2-3 Shift Solenoid (SS) valve circuit, then Diagnostic Trouble Code (DTC) P0758 sets.
Reading a bit on this and it could be either the PCM or the C2 Red connector at the PCM. The 2-3 shift control signal should be at pin 4 yellow with black stripe.
Most of the sites I've been to say that it should only be one hour of shop time to diagnose. If you have "creep" mode it might be worth it to have someone check it out.Thank you. The red connector on the PCM/ECM is where I was testing the connectivity from, down to the plug on the side of the transmission. The PCM/ECM is the part that I was trying to avoid replacing, because it's my understanding that it must be programmed. This truck is #3 in my line up and will probably be sold, once I get my Trail Blazer up and running again. I just gave Rock Auto about $600 for P/S hoses, P/S cooler, fuel pump, and misc parts.![]()
Damn it! I clicked on your link and now I'm getting emails from eBay asking if I want to purchase it.I'm at the point where this item may be the answer. I could mount it in the dash and manually control the solenoid grounds.
The Answer
Well, it is a good deal.Damn it! I clicked on your link and now I'm getting emails from eBay asking if I want to purchase it.![]()