42RLE Pressure Control Solenoid, new and ready to install. Fits the 42RLE. Ships fast from the USA.
This is a new Mopar electronic pressure control solenoid, part number 5078911AA, for the 42RLE four-speed automatic with variable line pressure. If your Jeep Liberty, Wrangler, Dodge Nitro, Ram 1500 V6 or four-speed Charger, Magnum or Chrysler 300 shifts hard into third and fourth, clunks coming down to a stop, or sets a line pressure code and drops into second-gear limp mode, the first question is whether your transmission even has this solenoid. Many 42RLE units do not, and that is the most common reason people order the wrong part.
The 42RLE is the rear-wheel-drive member of the Chrysler 604 family. Early units ran a fixed line pressure set by the pressure regulator valve, with no way for the computer to change it. On variable line pressure (VLP) units, the transmission controller drives this two-wire variable force solenoid to set line pressure, and a separate three-wire pressure sensor reports what the pressure actually is. The controller compares the two and adjusts pressure to engine load. The shift solenoid pack is still on the valve body and still selects the gears; this solenoid only decides how hard each clutch is squeezed.
Several of these complaints also come from the valve body itself. TransGo lists TCC slip or shudder with P0740, overheating, delayed forward or reverse, and the 4-3 and 2-1 coast clunk as common complaints on VLP units, so a new solenoid will not fix a worn bore or switch valve.
Start at the outside of the case. A VLP 42RLE has an extra connector next to the transmission range sensor connector. Early versions use a six-pin plug with pin 1 unused, later versions a five-pin plug; three of the wires feed the pressure sensor and two feed this solenoid. No extra connector means a fixed-pressure transmission that does not use this part. If the connector is there, read desired and actual line pressure on a scan tool and check solenoid duty cycle and resistance at that connector before opening the pan, since a failed sensor, chafed wiring or the controller can set the same code. Our 41TE and 42RLE limp mode and solenoid switch valve guide explains the codes and the valve body wear that mimics a solenoid problem, and the slipping under load guide covers what low line pressure does to the clutches.
The Mopar application list for 5078911AA covers 42RLE VLP units in the Jeep Liberty 3.7L and Wrangler 3.8L, Dodge Nitro 3.7L, Ram 1500 3.7L, Dakota 3.7L, Mitsubishi Raider 3.7L, and the 2.7L and 3.5L V6 Chrysler 300, Dodge Charger, Magnum and Challenger with the four-speed. VLP was phased in over the 2006 to 2007 model years, so a 2006 or 2007 vehicle can go either way; the case connector is the deciding check. The source list also names V8 Dakota and Durango models, but those trucks use a five-speed transmission, not the 42RLE, so do not order this solenoid for them. Compare the number on your old solenoid to 5078911AA, or send us your year and VIN and we will confirm. Front-drive cars with the 41TE use the 41TE pressure control solenoid, and all 41TE and 42RLE parts are on the 41TE and 42RLE collection page.
| Fits | 42RLE |
| Part type | Pressure Control Solenoid |
| Condition | New |
| Brand | Mopar |
| Reference | A604 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Look beside the transmission range sensor connector on the case. A variable line pressure unit has an extra five- or six-pin connector there. If it is missing, the transmission runs fixed line pressure and does not use this part.
Only if line pressure control is the cause. The coast clunk can also come from valve body wear or outdated software, so confirm with scan data and check for the controller update before replacing parts.
No. The front-drive 41TE uses its own solenoid. This listing is the Mopar 5078911AA for the rear-drive 42RLE.
No. The solenoid pack still controls the shifts on VLP units. This solenoid only sets line pressure.
Reset the line pressure counter, clear codes and perform the Quick Learn with a scan tool, then road test through all gears. Early VLP builds may also need a controller software update.
ATF+4. Other fluids change friction behavior and can cause harsh or flared shifts even with new parts.
