722.6 Transmission Valve Body with Conductor Plate

A Chrysler 300, Dodge Charger or Challenger that goes into limp mode stuck in second, or a Mercedes C-Class with a flare on the 2-3 upshift, usually comes down to one assembly under the pan: the electro-hydraulic control unit. This is a complete, refurbished and tested valve body for the Mercedes 722.6 five-speed, the same transmission Chrysler calls the NAG1 (W5A580). It arrives with the conductor plate, the shift solenoids, the modulating pressure and shift pressure solenoids and the TCC solenoid already mounted, and it cross-references OEM numbers 2112770101, 1402700561, 1402700161 and 10020951. Because it is a pulled and tested original unit, some residual ATF on it is normal.

What the valve body does in a 722.6

The 722.6 was one of the first five-speeds built around load-sensitive working pressure and overlap clutch control. The TCM uses the modulating pressure solenoid to set working (line) pressure to engine load, and the shift pressure solenoid to control each clutch-to-clutch overlap. The conductor plate is the circuit board bolted to the valve body that connects all those solenoids to the 13-pin case connector and carries the N2 and N3 speed sensors the TCM uses to calculate ratio and slip. When either side fails, the TCM sees bad ratios or bad pressure and drops into limp mode to protect the clutches.

Symptoms this assembly addresses

• Limp mode with the transmission locked in second gear (or reverse only), often after a hot drive
• Engine flare on the 2-3 or 4-5 upshift, or a neutral flare on the 5-4 or 3-2 downshift under load
• Harsh 1-2 or 2-3 shifts, or slipping and no upshift
• Speed sensor and ratio codes such as P0715, P0717 and P0720, and the Chrysler P0700 family
• Torque converter clutch slip or shudder linked to valve body pressure loss

How to confirm it before buying

Separate the electrical side from the hydraulic side first. Speed sensor codes that come and go point at the conductor plate; if that is the only fault and the shifts are otherwise clean, a NAG1 conductor plate with speed sensor by itself is the cheaper repair. Flares and pressure complaints point at the valve body: Transmission Digest traced many 2-3 flare limp-mode cars to wear in the working-pressure regulator valve bore, which lets solenoid signal oil leak past the valve so pressure does not rise with load. When you have both, replacing the full assembly covers it in one job. Our 722.6 valve body symptoms and testing guide covers the vacuum test and wear points, and 722.6 common problems and fixes covers the connector leaks that often come first.

Fitment

Listed for the Mercedes C230 (1997-2005), C240 (2001-2005), C280 (1994-2007), C32 AMG (2002-2004), C320 (2001-2005) and C350 (2006-2007), plus the Chrysler Crossfire (2004-2005), Chrysler 300 (2005-2014), Dodge Challenger (2008-2014), Charger (2009-2014 and 2016), Durango (2011-2013) and Nitro (2007, 2009-2011). The 722.6 family spans many torque ratings and calibrations (W5A580, W5A380, W5A330, W5J400), so match the part number on your old valve body to the OEM numbers above, or send us your year and VIN and we will confirm. More parts for this unit are on our 722.6 and 722.9 parts page.

Install notes

• Drain the fluid, remove the pan and filter, and unplug the 13-pin connector at the case.
• Remove the valve body bolts and lower the unit straight down so the manual valve and seals are not damaged.
• Fit a new 13-pin connector adapter seal, a new filter and a new pan gasket; reusing the old adapter seal is the classic cause of fluid wicking into the harness.
• Torque the valve body bolts to spec and in sequence.
• Fluid: Transmission Digest notes Mercedes, Crossfire and Sprinter units need Mercedes-specific fluid, while the other Chrysler applications use ATF+4. Use the fluid on your fill tag or owner's manual.
• Reset the transmission adaptations with a scan tool and road test so the shifts relearn, as the TransGo 722.6 instructions recommend after any valve body work.

If the pan is full of friction material, the valve body will not cure burned clutches; look at a 722.6 clutch module or a full rebuild instead.

Does this valve body come with the conductor plate and solenoids?

Yes. It is a complete assembly with the conductor plate, shift solenoids, modulating pressure and shift pressure solenoids, and the TCC solenoid installed.

Is it new or used?

It is a refurbished original unit that was pulled and tested, not a new casting. A little residual ATF on it is normal.

Will it fix my Chrysler 300 stuck in second gear?

If the limp mode comes from a conductor plate speed sensor fault or valve body pressure loss, yes, because this assembly replaces both. If the clutches are burned, a valve body will not fix slipping, so check the pan and the fluid first.

What fluid do I use?

Mercedes, Crossfire and Sprinter applications use Mercedes-approved 722.6 fluid; other Chrysler and Dodge NAG1 applications use ATF+4. Follow the spec on your fill tag or owner's manual.

Do I need a scan tool after installing it?

Yes. Clear codes and reset the transmission adaptations, then road test so the TCM relearns shift timing with the new valve body.

How do I make sure it fits my car?

Compare the part number on your old valve body with 2112770101, 1402700561, 1402700161 or 10020951, or send us your year and VIN before ordering.

• 722.6 Valve Body Symptoms and Testing
• 722.6 Common Problems and Fixes
• 722.6 Mercedes C Class Shift Problems: Diagnosis and Fix
• 722.6 Mercedes C Class Common Problems and Fixes