8HP45 Solenoid Kit, new and ready to install. Fits the 8HP45. Ships fast from the USA.
The 8HP45 is the lighter-duty member of ZF's eight-speed family, the box behind four- and six-cylinder BMWs and, in Chrysler form as the 845RE, the 3.6L Pentastar in the Charger, Challenger, 300, Durango, Grand Cherokee and Ram 1500. When one of those starts banging into gear, bumping on a 2-1 coast-down, flaring between upshifts or throwing a transmission malfunction message, owners search for exactly this part. This is a new, genuine ZF solenoid kit, OE part number 1087 298 388, made in Germany and packed in ZF's own box. It is the factory replacement set for the 8HP45 and 8HP70 mechatronic valve body.
Every shift in an 8HP45 is made by pressure, not by a mechanical shift valve. The control module bolted to the valve body commands a set of variable-force regulators, and each one feeds a single job: line pressure, converter clutch apply, one of the five shift elements, or park. On the Chrysler 845RE the same solenoids carry SOL names such as SOL LPS for line pressure, while BMW and ZF documentation uses EDS numbers, with EDS-7 as the line pressure regulator. When a coil weakens or the solenoid's internal seat wears, the module still sends the right command but the element it feeds gets too much or too little pressure, and the shift feels wrong.
On 845RE trucks, codes such as P1DCD and P0734 can come from the control software rather than the hardware. FCA bulletin 21-036-16 fixed that exact list on 2015 Ram 1500 3.6L trucks with a reflash alone. Read our ZF8HP shift solenoid symptoms guide before you spend money.
Check the control module calibration first, then test the circuit. Sonnax's ZF8-ZIP booklet calls for 5.0 ohms at 68 degrees F on each solenoid with the circuit board removed, measured with a meter that applies under 0.6 volts. A coil far out of range is a genuine solenoid failure. A coil that tests good on a transmission that still shifts erratically usually means worn valve bores or a leaking mechatronic sleeve, which is covered in our pressure control solenoid diagnosis article.
ZF part 1087 298 388 is the Gen 1 kit for the 8HP45 and 8HP70. The listing covers BMW, Jaguar, Land Rover and Rolls-Royce applications, 2014-up Jeep Grand Cherokee, and 2015-2023 Dodge Challenger, Charger and Durango. It does not fit second-generation units (8HP50, 8HP75, 8HP95 and 850RE), whose solenoids have different snout diameters. Because some Chrysler and Jeep models moved to Gen 2 starting in 2019, a late-model 3.6L may need the Gen 2 part. Match the valve body casting and separator plate code, or send us your year and VIN to confirm. All 8HP parts are on the ZF 8HP collection page.
If bench testing shows worn bores, pair the kit with a ZF8HP valve body shift kit instead of relying on new solenoids alone.
| Fits | 8HP45 |
| Part type | Solenoid Kit |
| 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.
The 845RE is Chrysler's version of the 8HP45, and the ZF 1087 298 388 listing covers 2014-up Grand Cherokee and 2015-2023 Charger, Challenger and Durango. Gen 2 850RE units built from 2019 onward use different solenoids, so confirm your generation first.
The 8HP45 is the unit used behind BMW's four- and six-cylinder engines in that era, and this kit is listed for BMW 8HP45 applications. Send us your VIN if you want the exact transmission confirmed before ordering.
Not necessarily. FCA bulletin 21-036-16 resolved P1DCD, P1B13 and P0734 on 2015 Ram 1500 3.6L trucks with a control module reflash only. Check the software level before replacing hardware.
About 5.0 ohms at 68 degrees F, measured with the circuit board removed and a meter under 0.6 volts. Readings well off that number indicate a failed coil.
ZF LifeguardFluid 8 or 9, with no additives. ZF's data sheet is explicit that only those two fluids are approved for the 8HP. A unit drained for solenoid work is refilled and leveled with the engine running at 30-50 degrees C, not by measured volume alone.
