6L45 Pump, used and ready to install. Fits the 6L45. Ships fast from the USA.
If your BMW with the six-speed automatic is slow to pick up Drive or Reverse, slips on every gear once it is hot, or has developed a whine that rises and falls with engine speed, the front oil pump belongs on the suspect list. This is a used original-equipment oil pump for the 6L45, the light-duty member of GM's six-speed rear-drive family, in the version BMW installed as the GA6L45R. This particular unit was removed from a 2011 BMW 328i convertible with roughly 92,000 miles that was confirmed running at the time of removal, and you receive the exact pump shown in the photos.
Every clutch apply, every shift and the converter clutch in a 6L45 depend on oil the pump moves. The pump is a variable-displacement vane design: a rotor driven by the converter hub carries vanes inside a pivoting slide, and the slide swings to raise or lower output as the pressure regulator calls for oil. That is why Sonnax sells a slide pivot pin and spring kit and a replacement vane for this family to cure erratic line pressure, pump leaks and pump noise. The transmission control module raises commanded pressure to compensate for a weak pump, so a tired pump often shows up as shift complaints before anyone suspects it.
Low pressure from a pump looks identical to low pressure from a worn valve body, a stuck regulator valve or a leaking clutch seal, so isolate it. Check fluid level hot first, then pull the pan and look at the filter and the debris. A line pressure test that comes up low in every range at idle and under load points at the pump or its regulator circuit; a problem confined to one gear points elsewhere. Our 6L80-family pump failure guide walks through the failure patterns that also apply to the 6L45, and the 6L45 limp mode guide covers the valve body and control module faults to rule out first.
This pump is listed for the 6L45 and came out of a BMW GA6L45R. The BMW version is not a straight copy of the GM-built 6L45 found in Cadillac models: Sonnax notes that the BMW 6L45 runs a bearing where the GM 6L45, 6L50, 6L80 and 6L90 use a pump bushing. Because of differences like that, compare the casting, bolt pattern and stator shaft on this pump to the one in your transmission, or send us your year and VIN before ordering. For a GM-built unit, browse the full 6L45 parts collection or the 6L45 pump for 2006-2018.
The pump comes out with the transmission on the bench, so treat this as part of a repair rather than a bolt-on. Before it goes in:
Because this is a used pump, look it over on arrival: spin the rotor by hand, check the slide moves freely and confirm there is no scoring in the pocket.
| Fits | 6L45 |
| Part type | Pump |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It came from a BMW GA6L45R, and the BMW version differs from the GM-built 6L45 in places such as the bearing BMW uses where GM uses a pump bushing. Compare it to your pump or send us your VIN before ordering for a Cadillac.
A 2011 BMW 328i convertible with about 92,000 miles, confirmed working at the time it was removed. You get the exact unit in the photos.
Run a line pressure test. Low pressure in every range at idle and under load points at the pump or regulator circuit, while a complaint in one gear usually points at a clutch, solenoid or valve body bore.
A new front seal, the filter and pan gasket, and fresh fluid at minimum. If there is clutch material in the pan, rebuild the unit with a master kit, and inspect the converter for internal damage.
Yes. Clear the transmission adaptations with a capable scan tool and drive the car through all six gears so the control module relearns shift pressures with the healthier pump.
