Replaces the failed conductor plate and internal speed sensors in the NAG1 722.6 valve body, curing limp mode and erratic shifts.
If your Charger, Durango, Wrangler, Liberty, Nitro or Magnum keeps setting P0715 and falling back to second gear, and the problem disappears for a while after you shut it off, you are looking at the classic NAG1 conductor plate failure. This plate is for the five-speed automatic Chrysler calls the NAG1 (Mercedes 722.6, sold as the W5A580 and W5J400 variants). It arrives with the N2 and N3 speed sensors molded in and includes the 13-pin connector adapter that passes the signals through the case to the transmission control module. It covers part numbers 1402701261, 52108308AC, 52108308AB, 68021352AA and 917-678.
Every electrical item inside the NAG1 lives on this one plate. The TCM powers the speed sensors with 4-8 volts and reads a square-wave signal back from each one; it switches the shift solenoids to ground, and it pulse-width modulates the line pressure, shift pressure and lockup solenoids. There are no pressure taps or pressure transducers in this transmission, so the pressures you see on a scan tool are calculated from those solenoid commands. That makes the plate the only window the TCM has into the unit, and a single cracked trace is enough to put it into limp mode.
You can test most of the plate at the 13-pin plug on the case without pulling the pan. The febi bulletin for this conductor plate lists pin 7 as the 4-8 volt sensor supply, pin 3 as the N2 signal and pin 1 as the N3 signal, about 4.5 ohms for each shift solenoid, about 5.5 ohms for the two pressure modulating solenoids, and about 2.7 ohms for the lockup solenoid, all measured against pin 6. An open reading or a sensor with no square wave confirms the plate. On 2012 W5A580 vehicles, rule out the Chrysler TCM reflash in bulletin 21-033-14 first if your only code is P0730. Our 722.6 common problems and fixes walks through the connector leak, and the valve body symptoms guide covers flares that a new plate will not cure.
This listing covers 2005-2020 Chrysler 300 and Crossfire, Dodge Challenger, Charger, Magnum, Durango, Nitro and Sprinter 2500/3500, and Jeep Commander, Grand Cherokee, Liberty and Wrangler with the five-speed NAG1. It does not fit the seven-speed 722.9 or any eight-speed. Over that span, many of these model lines offered more than one transmission depending on engine, so check the build sheet or transmission tag, compare your old plate number, or send us your year and VIN. More parts are on our 722.6 and 722.9 parts page.
If a solenoid measures out of range, the 722.6 pressure control solenoid or 722.6 solenoid kit can go in during the same job.
| Fits | |
| OEM part numbers | |
| Includes | |
| Vehicle years | |
| Item weight | |
| Warranty |
Yes. The N2 and N3 input speed sensors are molded into the plate, and the 13-pin connector adapter is included.
P0715 for the speed sensor circuit and P0748-P0753 for the solenoid circuits are the common ones. Confirm with a meter at the 13-pin plug before you buy.
Only if the vehicle has the five-speed NAG1. Some years and engines used other transmissions, so check the transmission tag or send us your year and VIN.
You should not. The adapter O-rings are the usual leak point, and fluid wicking up the harness causes the same codes as a bad plate. Use the new adapter in this kit.
ATF+4 for Chrysler, Dodge and Jeep NAG1 applications and Mercedes-specified fluid for Crossfire and Sprinter, per Transmission Digest. Follow your owner's manual.
Yes. Clear the codes and reset the transmission adaptations with a scan tool, then road test so the TCM relearns shift pressures.
