5L40E Valve Body 2006, remanufactured and ready to install. Fits the 5L40E. Ships fast from the USA.
A BMW 3 Series, 5 Series or X3 - or a GM Sigma-platform car like the Pontiac Solstice - that shifts harshly when the transmission is hot, slips between gears, or delays engagement is usually describing a worn 5L40E valve body rather than a failed clutch pack. This is a remanufactured valve body built to the 2006 specification of the 5L40E, the five-speed GM also supplies to BMW under the badge A5S 360R.
The 5L40E is an electronically controlled five-speed, and the valve body is the hydraulic circuit that turns the transmission computer's shift commands into actual clutch and band apply pressure. Pump pressure runs through the valve body's aluminum bores, and the solenoids mounted on it meter that pressure to each clutch pack. Rebuilders who work on this family report that its aluminum castings wear faster than older GM units, with the wear concentrated in the valve body bores and the torque converter clutch valve bore, which is why pressure-related complaints are the dominant failure pattern on this transmission rather than a single blown-out component.
Check fluid level and condition at the correct temperature first, since low or burnt fluid produces the same harsh-shift and slip complaints as a worn valve body. If the fluid is good and the symptoms persist, pull codes and check line pressure with a scan tool before ordering - a weak line-pressure rise with no other codes points at the valve body's boost circuit rather than a solenoid. Our guide to testing a shift solenoid with a multimeter covers how to rule the solenoids in or out before you replace the valve body around them.
The 5L40E was used across more than one platform, including BMW 3 Series, 5 Series and X3 (BMW code A5S 360R) and GM Sigma-platform vehicles, and the casting was revised more than once over its production run. This listing is built to the 2006 specification. The 5L40E and the visually similar 5L50E are easy to mix up at a glance - the reliable way to tell them apart is the case tag and the three-digit code stamped on the separator plate, not the year alone, so check your case tag or send your VIN before ordering if you are not certain which unit is in the car.
Drain the fluid, drop the pan, and unplug the internal harness connector before unbolting the old valve body, keeping the check balls and springs in the order they come off. Seat the replacement on the case dowels, start every bolt by hand, and torque them down in sequence so the separator plate seats evenly - an uneven torque sequence is a common cause of a valve sticking in a freshly installed valve body. Fit a new filter and pan gasket at the same time; the 5L40E/5L50E filter and pan gasket kit covers that side of the job. If the TCC solenoid is original to the car, replace the matching 2003-2007 TCC solenoid at the same time rather than reusing a worn one against a new valve body. Refill with the fluid your case tag specifies, clear the codes, and run the adaptive relearn on a road cycle before judging shift quality.
| Fits | 5L40E 2006 |
| Part type | Valve Body |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
They look nearly identical. Check the case tag at the left rear of the case just above the pan rail, and the three-digit code on the separator plate - the 5L50E uses a different separator plate and second-accumulator casting than the 5L40E. Match the tag, not just the model year.
It is used across more than one platform, most commonly BMW 3 Series, 5 Series and X3 (where BMW calls it the A5S 360R) and GM Sigma-platform vehicles such as the Pontiac Solstice. Confirm your specific application against the case tag or your VIN before ordering.
Rebuilders who have worked with Sonnax on this unit report that the aluminum valve body bores wear faster than on older GM transmissions, with the torque converter clutch valve bore and the pressure boost circuit as common wear points. That wear is more pronounced once the fluid thins out at operating temperature, which is why the complaint often shows up hot rather than cold.
Change the filter and pan gasket in the same job, and if the TCC solenoid is original to the car, replace it alongside the valve body rather than reusing a worn one against new hydraulics.
Yes. Clear the stored codes and run the adaptive relearn procedure with a scan tool, then road test through all five gears. Shift feel will be firmer than normal for the first several miles while the computer relearns.
Remanufactured and bench-tested before it ships. Confirm your year and case tag against this 2006 specification before installing, since the casting was revised more than once across the 5L40E's production run.
