6L45 Pump 2006-2018, new and ready to install. Fits the 6L45. Ships fast from the USA.
If your 6L45 or 6L50 six-speed is slow to engage, loses line pressure when hot, or whines with engine speed, and the pump housing itself is still serviceable, you do not always need a complete pump. This is a new pump rotor and slide repair kit for the GM 6L family. It is not a complete pump assembly: it contains the internal rotating parts that wear, so you can rebuild the pump you already have. Per the listing it includes one pump rotor, one pump slide, 13 pump vanes, a plastic vane guide, two vane guide rings and two pump rings, in the .708 in thick rotor and slide size, with industry references A104531CK and K135927A.
The 6L45, 6L50, 6L80 and 6L90 all use a variable-displacement vane pump built into the bellhousing. The converter hub drives the rotor, and the 13 vanes slide in and out of the rotor slots as they sweep around the inside of the slide. The slide pivots on a pin and is held toward full output by a spring; line pressure feedback swings it toward center to cut displacement when the transmission does not need the oil. Sonnax notes that pressure and centrifugal force on the vanes also push the slide toward center at high RPM. So the parts in this kit are exactly the ones that decide how much oil the pump moves: a worn vane tip, a scored slide bore or a rotor with loose vane slots means less volume at idle and less pressure under load.
A worn pump rarely sets a pump-specific trouble code. It usually shows up as a drivability complaint, or as slip or ratio codes after the clutches have suffered.
Check fluid level at temperature first, then measure line pressure. A pressure that is low in every range points at the supply side, but on this family the line pressure control solenoid in the TEHCM can produce the same reading, so rule it out before tearing down. Our 6L pump failure guide covers the pressure checks and the converter debris that kills most of these pumps, and the 6L45 limp mode guide covers the electrical side. Once the pump is apart, inspect the cover and body faces: if they are deeply scored, a kit will not save it and you need a complete pump such as our used OEM 6L45 pump.
The listing fits 2006-up 6L45, 6L50, 6L80 and 6L90 transmissions with the .708 in rotor and slide. 6L45 and 6L50 applications include the Cadillac CTS, STS and SRX, the V6 Camaro and BMW models with the GA6L45R. Measure the thickness of your old rotor and slide before ordering, since this kit is the .708 in size; if yours is different, it is not the right kit. On BMW units also note that the pump bushing position uses a bearing instead of a bushing, which does not change the rotor and slide but matters when you order other pump parts. Send us your year and VIN if you want us to check. See all parts for this unit on our 6L45 transmission page.
Lay the old parts out in order before removing them and note the vane guide ring positions. Clean the pump pocket and check the slide bore and pivot pin for wear. Lubricate every part with Dexron VI before assembly, confirm all 13 vanes move freely in the rotor, and torque the pump cover bolts evenly. Replace the pump bushing or seal while it is apart, and inspect the converter hub; see converter hub and pump bushing wear. If the pump failed from converter debris, flush the cooler and replace the filter; the 6L45 filter and pan gasket kit covers BMW units, and a 6L45 master rebuild kit covers a full overhaul. Refill with Dexron VI and run a fast learn with a scan tool afterward.
| Fits | 6L45 2006-2018 |
| Part type | Pump |
| Condition | New |
| 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.
No. It is a rotor and slide repair kit: rotor, slide, 13 vanes, vane guide, vane guide rings and pump rings. You reuse your pump body and cover. If those are scored, buy a complete pump instead.
The listing covers the 6L45, 6L50, 6L80 and 6L90 in the .708 in rotor and slide size. Measure your old rotor and slide thickness to confirm before ordering.
The BMW version is a 6L45 and the kit is listed for the 6L45. BMW units use a bearing where GM uses a pump bushing, so match your old rotor and slide size and order bushing-area parts separately.
Dexron VI. Lubricate all pump parts with it during assembly and refill the transmission with it.
It is good practice. Clear the adaptive values and run the transmission fast learn with a capable scan tool so shift pressures are recalculated for the restored pump output.
