5R110W Internal Wiring Harness 2003-2018, remanufactured and ready to install. Fits the 5R110W. Ships fast from the USA.
The 5R110W TorqShift outlived the 6.0L and 6.4L Super Duty pickups by years, and that is why this harness is listed for 2003 through 2018. If you run an older diesel Super Duty, an E-Series van, or a V10 motorhome or work chassis with the TorqShift and you are seeing solenoid codes, failsafe shifts or a transmission that only misbehaves when hot, a remanufactured internal wiring harness is a low-cost fix worth ruling in or out before you price a solenoid body.
Inside the case, everything electrical lives on the solenoid body: seven variable-force solenoids, the TFT thermistor that twist-locks into the body, and on early units a set of normally closed pressure switches. Transmission Digest notes that on the original harness the natural-colored plugs feed the solenoids, the black plugs go to the pressure switches, and the TFT sensor and the internal range sensor each get their own connector. All of it gathers at the pass-through connector in the case. Sonnax maps each solenoid to the clutch it applies, which is why one broken lead in this harness can take out a specific gear rather than the whole transmission.
Back-probe the circuits at the pass-through connector with the engine off and compare against the readings in our 5R110 solenoid testing guide. Wiggle the external harness and the connector while watching the meter. If a circuit reads open or shorted at the case but correct when measured directly at the solenoid, the internal harness is the fault. If both readings are bad, the solenoid itself is suspect. Also rule out the external engine harness and the PCM side, which on diesel trucks can be damaged by fuel or coolant contamination.
The listing covers the 5R110W from 2003 through 2018. That span includes the 2003-2010 Super Duty pickups and Excursion, plus the later vans and chassis that kept the TorqShift. Two things vary across those years. Early 2003-2004 solenoid bodies used pressure switches that Ford deleted in late 2004, and the unused switch leads on a harness are left disconnected. Connector layout can also differ between harness revisions, so match your old harness plug for plug against the photo, or give us your year and VIN to check. The full 5R110W parts collection has solenoids, filters and kits for every year in that range. If your truck is a 2003-2010 pickup, compare this page with our 2003-2010 internal harness as well.
| Fits | 5R110W 2003-2018 |
| Part type | Internal Wiring Harness |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for the 5R110W from 2003 through 2018, which covers the later TorqShift applications beyond the Super Duty pickups. Because harness revisions differ, compare plug count and layout with your old harness or send us your year and VIN.
Both serve the same solenoid body function. This listing covers the wider 2003-2018 span; the 2003-2010 listing is aimed at the pickup years. Match your existing harness to the photo to choose.
Heat expands terminals and insulation, so a cracked wire or loose pin can open up only at temperature. That pattern, especially with circuit-type codes, points toward the harness or a connector rather than a worn clutch.
Test them first. If any solenoid is out of range or the unit has high mileage, replacing them during the same pan drop saves labor and fluid.
Yes. Clear codes and run Ford's adaptive relearn with the fluid at 130 F so the PCM rebuilds its shift adapts on the repaired circuits.
