Current code in picture 1, and previous/history codes are in the 2nd picture. Any idea whats going on? Transmission fault popped up while driving on highway, didnt want to upshift, barely made it to parking. After clearing the code - nothing, same issue, unplugged batteries waited 15-20 min, same code popped up. Truck didn't want to go in R or D, kept flashing F, auto. Went under truck after visiting this page: https://productinfo.serviceranger4.com/books/TRTS0940/lang/en-us/section/TS4080FC66Gen1 Pushed the 2 connectors (3-Way Gen1 ECA Connector and the 1 above it) in a little and code went away - and was able to drive truck normally like everything was fine. What can be the issue here? Bad actuator? Bad clutch? Bad connectors? Bad fuse on the eca connector? Bad wiring?
First thing to do would be to carefully check all the wiring coming from the transmission. Pull apart any connectors and look for corrosion. Even if no corrosion best to clean with a cleaner such as Deoxit and then use silicone dielectric grease before re-connecting. The Eaton website has complete diagnostic manuals that can be downloaded for free. The manual gives diagnostic procedures for each code. Almost 400 pages so too large to attach here. After checking the wiring and connections I would clear the codes and drive to see if any come back. May have just been a loose connection. The ECA was not getting the voltage it needs. The code in the 2nd pic, 520271 FMI 4. Your link tells what to check for that code and FMI 4. The ECA operates on a non-switched battery power supply. FMI 4 – Voltage Below Normal or Shorted Low: FMI 4 ECA Vehicle Harness Damaged wiring between the vehicle batteries and 3-Way ECA Connector Bent, spread, corroded or loose terminals Wiring shorted to ground, shorted to power or open
So how wasnt it getting enough voltage? It happened twice that day while I was driving, thankfully 2nd time it happened (as I was on the highway) I was close to my parking and somehow made it without stopping, barely. When I pushed the 2 connectors in a little the code went away. After that I went under again and unplugged both of them, cleaned them with an electric cleaner, put some dielectric grease, plugged them back in and secured with zipties. Did a short drive with it and everything was fine, no issues. Hopefully I dont get the same issuue again when Im otr.
Ok. Same issue on a ‘22 579. I’m under the transmission and finding no ECA as described in the schematic. No, I’m not a wrench, but I can follow directions. I’m finding nothing in the location shown in the diagram linked above. These connectors are external, correct? Any assist would be appreciated. Trying to avoid being stuck in some POS while mine sits in some shop gathering dust. Thanks.
Maybe since yours is a ‘22 it’s different? The 2 connectors were by the transmission actuator, external yes
If you’re not aware, PACCAR are notorious for their shift stalks failing at inopportune times, like stop signs and stoplights. Mine even popped into neutral, on the interstate, with the cruise set. The randomness of their different faults will drive the unknowing crazy. I’ve had it in my T680 and my buddy’s 579 started doing it, shortly after.
Get the latest TCM update installed. With backing, I use my right foot to apply just enough throttle to engage the clutch and my left to modulate the brake, keeping me from slamming the dock. My 1st pickup is uphill into their dock, so I had to relearn some things, after being in a Volvo. PACCAR are the worst.
