5L40E Pressure Control Solenoid 1995-2003, new and ready to install. Fits the 5L40E. Ships fast from the USA.
A BMW 325i, 330i, 530i, X5 3.0 or Z3 with the GM 5L40E five-speed, or a 2003 Cadillac CTS, that slams into Drive, firms up on every shift, or turns shifts slow and mushy when hot is often pointing at line pressure control. This is a new 5L40E pressure control solenoid matching Rostra reference D84431G: a black solenoid with a short neck and an oval two-blade connector, an aluminum body and a spool valve on the hydraulic end, as shown in the photo.
The 5L40E gets all five forward gears from one Ravigneaux gearset, so every shift is a timed release of one clutch and apply of another. How firmly those clutches clamp is set by line pressure, and line pressure is set by this solenoid. The transmission computer varies the current to it, the solenoid produces a matching signal pressure, and the pressure regulator valve raises or lowers line pressure in response. On the 5L40E the pressure control solenoid assembly is mounted on the front control valve body, beside the actuator feed limit valve and the converter clutch regulator apply valve. If the coil drifts, the spool sticks, or its seals leak signal oil, line pressure stops matching what the computer requests.
Ratio codes on this transmission need care. TransGo documents that wear in the actuator feed limit valve bore starves the shift solenoids of oil and sets P0731 through P0735, often starting with a fifth gear error when hot. That is a valve body bore problem, not a pressure solenoid, so read our gear ratio code guide before buying parts. For the solenoid itself, check fluid level and condition, measure the circuit with our multimeter test, and if possible put a gauge on the line pressure tap to see whether pressure follows the command.
Read this section before ordering, because the year range in the title is wider than the 5L40E itself. The 5L40E entered production for BMW's 1999-2000 models, so there is no 1995 5L40E. The earlier years come from the solenoid's wider use: the same Rostra D84431G (since superseded by A84431G) also serves GM front-drive 4T40-E, 4T45-E and 4T65-E transmissions back to 1995. For the 5L40E, Transtar's catalog places this solenoid on the 2000 BMW 323i, 328i and 528i, the 325i, 330xi, X5 and Z3 into 2003, the 2001 530i, and the 2003 Cadillac CTS. The same catalog also lists it for some later GM rear-drive applications, including the 2006-2009 Pontiac Solstice and 2007-2010 Saturn Sky, but this listing is sold for the 2003-and-earlier range, so owners of later cars should match their old part carefully. Compare the connector shape and spool length with the photo, or send your year and VIN and we will check fitment.
The solenoid is reached by removing the oil pan. Unplug it, remove its retaining hardware, and pull it from the valve body; look at the bore and the old spool for scoring or debris. Lubricate the new seals with clean fluid before installing. Because the pan is off, replace the filter and gasket with our 5L40E/5L50E filter and pan gasket kit, and refill with the fluid specified for your vehicle, since BMW and Cadillac specifications differ. Fill through the side fill plug with the fluid at the specified temperature. If more than one solenoid circuit tested bad, the 5L40E 1999-2003 solenoid kit replaces the set. Clear codes and reset the transmission adaptations afterward, as covered in our adaptive relearn guide.
| Fits | 5L40E 1995-2003 |
| Part type | Pressure Control Solenoid |
| Condition | New |
| Brand | OEM |
| Reference | D84431G |
| Ships | From the USA |
| Warranty | 1-year |
Not as a 5L40E part. The 5L40E did not exist before the 1999-2000 BMW models. The earlier years in the title reflect this solenoid's use in GM front-drive 4T40-E and 4T65-E transmissions.
The six-cylinder automatic 3 Series, 5 Series, Z3 and X5 3.0 from about 2000 to 2003 for this solenoid. All-wheel-drive xi versions used the 5L50 variant; match your old part before ordering.
Yes, the parts catalog lists this solenoid for the 2003 CTS with the 5L40E. For a later CTS, compare your existing solenoid with the photo or send us the VIN before ordering.
Possibly not. On the 5L40E, worn actuator feed limit valve bores are a common cause of ratio codes. Check line pressure and the valve body before replacing the solenoid.
Yes. Clear codes and reset the transmission adaptations with a capable scan tool, then drive gently through all gears so the controller relearns shift feel.
