8HP70 Pressure Control Solenoid, new and ready to install. Fits the 8HP70. Ships fast from the USA.
The 8HP70 is the eight-speed that sits behind the bigger engines: Hemi and SRT Chrysler, Dodge, Jeep and Ram models, plus many V8 and diesel BMW, Jaguar and Land Rover applications. When one of them starts banging the 1-2 shift on a cold morning, hesitates going from Reverse to Drive, or slips with a line pressure code, owners go looking for a pressure control solenoid. What you get here is the genuine ZF solenoid kit, part number 1087 298 388, new in the ZF carton pictured. The line pressure solenoid is in the kit, along with the solenoids for each clutch and brake and the converter lockup, which is how most shops prefer to service a high-mileage 8HP70.
Rated at roughly 650 to 700 Nm, the 8HP70 has to clamp its clutches hard, and all of that clamping starts with line pressure. The transmission module commands the line pressure solenoid (SOL LPS in Chrysler terms, EDS-7 on BMW) to raise or lower main pressure with load and throttle. Five more regulators then feed the A and B brakes and the C, D and E clutches, three of which are applied in each gear. A worn pressure solenoid throws off that base pressure for every element at once, which is why the complaint is rarely limited to one gear. On a towing Ram or an SRT Jeep, low pressure under load turns into flare and clutch wear quickly.
Some of these complaints were fixed in software. Chrysler bulletin 21-018-15 reflashed the 2015 Jeep Grand Cherokee SRT with the 8HP70 for harsh or inconsistent shifts, an erratic cold 1-2 upshift and delayed Reverse-to-Drive engagement, so confirm the module is up to date first. Then check the fluid level hot and look for the leaking mechatronic connector sleeve, a common pressure leak. If codes point at a solenoid, test it on the bench with the circuit board removed; Sonnax's ZF8-ZIP booklet specifies about 5.0 ohms at 20 C. Our ZF8HP EPC solenoid guide covers the test sequence, and our Charger shift problems guide matches complaints on Hemi cars.
ZF lists kit 1087 298 388 for the first-generation 8HP45 and 8HP70, which covers the Chrysler-family 8HP70 in the 2014 and later Grand Cherokee and the 2015-2023 Charger, Challenger and Durango, as well as BMW, Jaguar, Land Rover and Rolls-Royce applications. It does not fit the second-generation 8HP75 or Chrysler 850RE, where Transmission Digest shows the solenoid caps changed and the B and D positions swapped. Ram 1500 owners in particular should confirm which generation their truck has. Match the cap colors and connectors in the photo against your valve body, or send us your year and VIN. More eight-speed parts are on the ZF 8HP collection page.
Drain the fluid, remove the pan, unplug the connector sleeve and lower the mechatronic. Replace the solenoids one position at a time so none end up in the wrong bore, and check each bore for wear while it is open. Install new O-rings lubricated with fluid and tighten the retaining plates evenly. Replace the connector sleeve and the pan, since the filter is part of the pan; the 8HP70 fluid and filter service kit and an aluminum 8HP70 pan with gasket are both options. Fill only with ZF LifeguardFluid 8; Sonnax notes a dry, overhauled unit takes about 9 liters before installation, while an in-car service needs less. Set the level at temperature, clear codes, reset adaptations and drive through all eight gears so the module relearns.
| Fits | 8HP70 |
| 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.
Yes. It is genuine ZF kit 1087 298 388, which includes the line pressure solenoid along with the clutch, brake and converter lockup solenoids shown in the photo.
The kit is listed for the 2015-2023 Charger, Challenger and Durango with the first-generation ZF eight-speed. Confirm your unit is first generation by comparing the solenoids to the photo or sending us your VIN.
No. Those are second-generation transmissions with different solenoid caps and relocated B and D solenoids.
Sometimes. Chrysler bulletin 21-018-15 reflashed the 2015 Grand Cherokee SRT 8HP70 for harsh shifts and delayed Reverse-to-Drive engagement. Check for calibration updates before replacing parts.
ZF LifeguardFluid 8. ZF's product data sheet permits only LifeguardFluid 8 or 9 in these transmissions.
Yes. Reset the transmission adaptations with a scan tool and drive through every gear at varied throttle so the module relearns clutch fill with the new solenoids.
