8HP45 Pressure Control Solenoid, new and ready to install. Fits the 8HP45. Ships fast from the USA.
Most people who search for an 8HP45 pressure control solenoid drive a V6 Ram 1500, a V6 Charger, Challenger or Durango, a Grand Cherokee, or a four-cylinder BMW, and the transmission has started shifting soft, slamming into gear, or logging a pressure code. This listing is the genuine ZF solenoid kit, ZF part number 1087 298 388, made in Germany and packed in the ZF carton shown in the photo. It contains the line pressure solenoid this page is named for together with the rest of the regulators that sit in the valve body, so one purchase covers the whole set instead of one piece at a time.
The 8HP45 is ZF's 450 Nm first-generation eight-speed, and Chrysler builds a licensed version of it as the 845RE. Both are fully electronic: the transmission module meters a variable current to one solenoid that sets main line pressure, and separate solenoids then trim pressure to each shift element. Sonnax's identification guide lists that line pressure part as SOL LPS on the Chrysler 845RE and EDS-7 LP on BMW units. Around it sit SOL A through SOL E for the five shift elements, SOL TCC for converter lockup, and SOL Park. When line pressure is low, clutches take too long to grip and the shift feels soft or slips. When it reads high, every gear change and every engagement gets hard.
Check software before hardware. FCA bulletin 21-036-16 is a shift-enhancement reflash for the 2015 Ram 1500 with the 3.6L and 845RE, and lists codes including P1DCD and P1B13, so make sure your truck has current calibration before buying parts. Next, rule out low fluid and the leaking mechatronic connector sleeve. Then pull the codes and note which solenoid each one names. With the valve body on the bench and the circuit board removed, Sonnax's ZF8-ZIP booklet puts each solenoid at roughly 5.0 ohms at 68 F. Our pressure control solenoid guide walks through those checks, and our Grand Cherokee 8-speed guide covers the Jeep side.
ZF kit 1087 298 388 is listed for the first-generation 8HP45 and 8HP70 and the matching Chrysler 845RE. The application notes cover BMW, Jaguar, Land Rover and Rolls-Royce, the 2014 and later Jeep Grand Cherokee, and the 2015-2023 Dodge Challenger, Charger and Durango. Second-generation 8HP50 and Chrysler 850RE units are not a match; Transmission Digest documents that Gen 2 uses different solenoid caps and snout diameters and moves the B and D solenoids. Pickups and SUVs changed generations at different points, so compare the solenoids in the photo with yours or send us your year and VIN. You can see every eight-speed part we carry on the ZF 8HP collection page.
Drain the fluid and remove the pan, then unbolt and lower the mechatronic unit. Swap solenoids one at a time, matching each to its original bore, and inspect every bore for wear. If the bores are scored, solenoids alone will not restore pressure; that is when a complete 8HP45 valve body with solenoids makes more sense. Lubricate the new O-rings with fluid, torque the retainers evenly and fit a new connector sleeve. On Ram, Jeep and Dodge models, a pan, filter and ATF service kit replaces the filter that is molded into the pan. Refill with ZF LifeguardFluid 8 only, check the level at operating temperature, then clear codes, run the adaptation reset and road test through every gear.
| Fits | 8HP45 |
| Part type | Pressure Control Solenoid |
| 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 the genuine ZF kit 1087 298 388, which includes the line pressure (SOL LPS / EDS-7) solenoid and the other valve body solenoids shown in the photo.
It is listed for the 845RE, the Chrysler-built first-generation 8HP45. If your truck has the newer 850RE, it will not fit. Send us your year and VIN and we will check which unit you have.
Yes, the kit is listed for BMW applications with the first-generation 8HP45. Second-generation 8HP50 units need different solenoids.
Yes. FCA released shift-enhancement reflashes for these transmissions, including bulletin 21-036-16 for the 2015 Ram 1500 3.6L. A calibration update can fix shift complaints without parts.
ZF LifeguardFluid 8. ZF's data sheet allows only LifeguardFluid 8 or 9 in these transmissions.
Yes. Clear codes, reset the transmission adaptations with a scan tool, and drive through every gear at varied throttle so the module relearns clutch fill.
