Replaces the failed conductor plate and internal speed sensors in the NAG1 / W5A580 valve body on Chrysler 300, Charger and Grand Cherokee.
Searching for part number 52108308AC usually starts with a Chrysler 300, Charger, Grand Cherokee or Sprinter that will not crank in park, shows a jumpy speedometer, or sits locked in one gear with the check engine light on. This is the replacement conductor plate for the NAG1 five-speed (Mercedes 722.6, W5A580), supplied with the speed sensors built in and the 13-pin case connector. It cross-references 1402701261, 52108308AC, 52108308AB, 68021352AA, 917-678, 5S9573 and SU11035.
Inside the pan, this plate is the transmission's wiring harness, sensor cluster and solenoid socket in one piece. The six solenoids press into contacts on the plate. Molded into the plate are the two Hall-effect speed sensors, N2 and N3, the fluid temperature sensor, and the park/neutral contact, a magnetic reed switch worked by a plunger off the inside detent. ATSG points out a detail that explains a lot of odd NAG1 complaints: the temperature sensor is wired in series with that park/neutral contact. The TCM only sees real fluid temperature in reverse or a drive range, and it uses the park/neutral state to allow or block cranking. One cracked trace in that shared circuit can produce both a no-crank and a temperature or range fault at the same time.
With the harness unplugged you can test most of the plate from the 13-pin socket on the case. febi lists pin 4 and pin 12 as the temperature sensor and park/neutral circuit, reading about 800 to 1200 ohms at 20 C with the selector in drive or reverse. In park or neutral that circuit should read open because the reed switch has opened. If it reads open in drive too, or never opens in park, the plate is faulty. Pin 7 should carry 4 to 8 volts of sensor supply with the key on, and the N2 and N3 signals should switch as the input turns. Check the connector for oil before condemning the plate; a weeping adapter seal gives the same codes. Our 722.6 speed sensor symptoms guide walks through the sensor test, and the 722.6 valve body symptoms guide helps separate an electrical fault from a hydraulic one.
This listing covers the five-speed 722.6 / NAG1 / W5A580 as used in the Chrysler 300 and Crossfire, Dodge Challenger, Charger, Magnum, Durango, Nitro and Sprinter 2500/3500, and Jeep Commander, Grand Cherokee, Liberty and Wrangler, within the 2005-2020 span given for this part. Not every model in that list used the five-speed for every year, and the 722.6 went through several conductor plate versions, so match the number molded on your old plate to the list above or send us your year and VIN. ATSG also notes that later plates are protected by white plastic solenoid covers; if your old plate had them, move them over. It does not fit the 722.9 seven-speed. See more parts for this unit on our 722.x transmission parts page.
This is a pan-off job: release the 13-pin plug, pull the pan and filter, lower the valve body, then transfer the solenoids to the new plate in their original positions. ATSG warns that the solenoid contacts are a press fit, so make sure each terminal grips snugly when the solenoid goes in. Torque the solenoid retainers and valve body bolts evenly to spec and fit a new filter and pan gasket; the 722.6 service kit covers filter, gasket and fluid for Sprinter owners. Chrysler, Dodge and Jeep units take ATF+4, while Sprinter and Mercedes-badged units use Mercedes-approved fluid. Set the level hot. Mercedes-badged applications generally need an adaptation reset afterward before shift quality settles. If any solenoid read out of range, replace it now with a 722.6 solenoid kit.
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Yes. The park/neutral contact is built into the plate and wired in series with the fluid temperature sensor. If that circuit opens, the TCM may not allow cranking in park or neutral, and you may also see a temperature or range fault.
Codes caused by the plate itself, most often P0715 and P0720 speed sensor circuit faults and P0748 through P0753 solenoid circuit faults. Confirm the connector is dry and the wiring to the TCM is intact before replacing it.
They are listed as interchangeable references for this plate, along with 68021352AA and 917-678. Because the 722.6 used several plate versions, compare the number on your old plate or send us your VIN to confirm.
Chrysler, Dodge and Jeep NAG1 applications usually drive normally after a fluid level check. Mercedes-badged 722.6 vehicles generally need the transmission adaptations reset with a scan tool.
Chrysler, Dodge and Jeep NAG1 units use ATF+4. Sprinter and Mercedes units use Mercedes-approved ATF. Always check the level hot, in park with the engine running, using the correct procedure.
