Eleven-piece shift and pressure solenoid set with the internal wiring harness for ZF 6HP26 valve bodies, OE reference 1068298043.
A ZF six-speed that throws electrical faults which clear and come back, drops into failsafe on a hot day, or shifts hard and late even after a fluid service may have two problems at once: worn solenoids and a tired internal harness. This 11-piece kit covers both. It pairs a full solenoid set with the internal bridge harness that runs across the valve body to the case connector, OE reference 1068298043, for the 6HP family used in BMW 3, 5, 6 and 7 Series, X3, X5 and X6, Jaguar S-Type, XJ and XK, Land Rover Discovery and Range Rover, and the Audi and VW models built on the same gearbox.
The 6HP26 is managed by a control unit bolted to its own valve body. That unit fires the solenoids, and the solenoids set the pressure on each clutch through every shift. In the 6HP26, a Generation 1 unit, that means one on/off shift solenoid called MV1 and six electronic pressure regulators. The harness in this kit is the link between them and the case connector. It lives in hot fluid for its entire life, and once its insulation hardens or a lead chafes, the computer can see an open or shorted circuit for a moment and react as if a solenoid failed.
Pull faults from the transmission module and note whether they are electrical circuit faults or performance faults. Circuit faults that come and go point toward the harness or connector; steady performance faults point toward the solenoids or the hydraulics behind them. Unplug the case connector and look for fluid or green corrosion on the pins. Our ZF6HP shift solenoid guide explains how the faults map to each solenoid, and the ZF6HP BMW 3 Series common problems guide covers the connector sleeve leak in detail.
The listing covers the 6HP19, 6HP21, 6HP26 and 6HP32. Be aware that ZF changed the solenoid layout between generations: the 6HP19, 26 and 32 use MV1 and a single D/E solenoid, while the 6HP21, 28 and 34 dropped MV1 and use separate D and E clutch solenoids. A set that covers both generations will not use every piece on a given unit. Lay the old solenoids out in order as they come off and match each new one by body, connector and position before it goes in. If you are unsure which generation you have, send your year, model and VIN and we will check it. The rest of our six-speed parts are on the ZF 6HP parts page.
Drain the fluid and remove the pan. On many of these vehicles the pan is plastic with the filter built in, so order a new 6HP26 pan and filter kit. Release the case connector, unbolt the mechatronic unit in a cross pattern, and set it on a clean bench. The harness lifts off the valve body as an assembly once its clips are released; route the new one exactly as the old one sat so no lead can rub on a bolt head. Install the solenoids with new O-rings lubricated in clean fluid. Replace the connector sealing sleeve while the unit is out with our sleeve and connector seal kit, because a leaking sleeve will soak a new harness the same way. Refill with ZF Lifeguard 6 or an approved fluid at the specified temperature, clear faults, reset adaptations and complete a gentle drive cycle through all six gears.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The internal harness sits in hot fluid for its whole life. When insulation hardens or a lead chafes it causes intermittent circuit faults that can look like a bad solenoid, so doing both at once removes the guesswork.
The listing covers the 6HP19, 6HP21, 6HP26 and 6HP32, but the generations use different solenoid layouts. Match every new solenoid to the old one by body, connector and position, and send us your VIN if you are unsure.
The OE reference for the set is 1068298043. Compare it with the number on your old parts or your parts catalog lookup before installing.
No. That leak comes from the connector sealing sleeve. Replace the sleeve while the mechatronic unit is out, or new fluid can wick into the new harness.
Refill with ZF Lifeguard 6 or an approved fluid at the specified temperature, clear the faults, reset the transmission adaptations and drive gently through every gear so the control unit relearns.
