Remanufactured pressure and shift solenoid set for the ZF 8HP45 mechatronic unit, also fitting 8HP70 and 8HP90 valve bodies.
If your 2011-2016 BMW X3, X5 or X6 bangs on the 1-2 upshift, flares between gears, shudders around 40-50 mph under light throttle, or drops into limp mode with a pressure control code, the solenoids inside the ZF mechatronic unit are the most likely cause. This is a remanufactured solenoid set for the first-generation ZF 8HP45, also listed for the 8HP70 and 8HP90 that share its valve body family. Each solenoid is cleaned, inspected and flow tested before it ships, so it costs a fraction of a new dealer mechatronic unit while fixing the part that actually wears.
BMW put the 8HP45, rated around 450 Nm behind gasoline engines, behind its four- and six-cylinder engines across the F25 X3, F15 X5, F16 X6, E89 Z4 and the F30 and F10 sedans. The transmission has five shift elements, and the computer controls each one directly with an electronic pressure regulator rather than a hydraulic shift valve. Sonnax's solenoid identification guide for the BMW ZF8HP45/70 names them EDS-1 through EDS-7, covering elements A through E, the torque converter clutch (EDS-2) and line pressure (EDS-7), plus an on/off MV-1 valve. A regulator whose spool sticks or whose screen clogs no longer delivers the pressure the computer asks for, and the result is the harsh, late or slipping shift drivers describe.
Rule out the easy things first: fluid level at temperature, and the common leaking connector sleeve on the mechatronic unit, which drops pressure and mimics failing solenoids. Then read transmission codes with a BMW-capable scan tool. Out of the car, Sonnax's ZF8-ZIP test booklet gives about 5.0 ohms at 20 C (68 F) for these regulators with the circuit board removed. Our ZF8HP shift solenoid guide explains how to tell a solenoid fault from worn clutches, and our BMW 8HP shift problems guide covers the same 8HP45 in the F30 sedans.
The manufacturer lists this set for the BMW X1 2.0L (2016), X3 2.0L (2013-2016) and 3.0L (2011-2016), X5 2.0L (2016), 3.0L and 4.4L (2013-2016), X6 3.0L and 4.4L (2012-2016), Z4 2.0L (2012-2016), and the Dodge Charger 6.4L and Durango 5.7L (2012-2016), whose Hemi V8s use the 8HP70 case. The manufacturer part number is CXT-CP-J00933. ZF ran internal variants across these years, and second-generation units (8HP50 and later) move the B and D solenoids and use different caps, so they need different parts. Compare your solenoid cap colors and connectors with the photo, which shows ten pieces: three orange-capped and four cream-capped regulators, a black-bodied unit, a green-connector unit and a rod-type actuator. If in doubt, send us your year and VIN. More eight-speed parts are on our ZF 8HP collection page.
This is a pan-off, mechatronic-out job. On the BMW the plastic pan includes the filter, so it is replaced as one assembly; do not reuse it. Note where each solenoid came from, fit the new ones with fresh O-rings wetted with fluid, and replace the mechatronic connector sleeve while it is apart. Refill only with ZF LifeguardFluid 8, such as our Lifeguard 8 service fill, and set the level through the fill plug at the specified temperature with the engine running. Clear codes and reset adaptations afterward. If a stored code points at line pressure only, a single 8HP pressure control solenoid is an option; if you prefer new genuine ZF parts over remanufactured, see our new ZF Gen 1 solenoid kit.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 3.0L X5 from 2013-2016 is on the manufacturer's fitment list. Confirm your transmission is the first-generation 8HP45 and compare your solenoid caps to the photo before ordering, or send us your VIN.
No, they are remanufactured: removed, cleaned, inspected and flow tested. Expect normal cosmetic wear on the bodies. We also carry a new genuine ZF kit if you prefer new.
If the shudder comes from a worn torque converter lockup regulator, yes. If the converter clutch itself is worn or the fluid is badly degraded, solenoids alone will not cure it, so check fluid condition and codes first.
Yes. The BMW 8HP pan has the filter built in and is replaced as one unit whenever it comes off. Budget for the pan and about a full service fill of ZF LifeguardFluid 8.
No. Those are second-generation transmissions with relocated B and D solenoids and different caps. This set is for the first-generation 8HP45, 8HP70 and 8HP90.
