5HP19 Pump

Looking for a replacement front pump for a ZF 5HP19 out of a BMW 325i, 330i or 530i, an Audi A4 or A6, a VW Passat or a Porsche Boxster? This remanufactured 5HP19 pump is aimed at the rebuild where the pump came out scored, the bushing is walked out of round, or the gears show heavy wear on their faces. It replaces the assembly as one unit, so you are not sourcing a housing, gears and seal separately and hoping they match.

What the pump does in a 5HP19

The 5HP19 is a five-speed built around a Ravigneaux gearset, with three planetary sets, four clutches and three brakes. None of those apply elements can work without oil pressure, and that pressure starts at the front pump. It is a gear-type pump: an inner drive gear keyed to the torque converter hub turns inside an outer ring gear, and the crescent-shaped gap between them carries fluid from the suction side to the pressure side. Because it is driven straight off the converter, output rises and falls with engine speed, and the valve body regulates it down to line pressure. When the gear side clearances open up or the cover face is scored, the pump leaks internally. At hot idle, when the fluid is thinnest and the pump turns slowest, that leakage shows up first.

Symptoms that point to the pump

• A long pause before the car moves after selecting Drive or Reverse, worse once it is fully warm
• Every gear feels soft or slips under throttle, not just one shift
• Whining from the bell housing area that rises and falls with engine speed, present even in Park
• ATF leaking from between the engine and transmission, often a worn front seal riding on a loose bushing
• Bronze-colored debris in the pan from a failing pump bushing

Keep in mind that a 5HP19 that slips only in reverse when hot, or flares on the 2-3 shift when hot, is often a valve body accumulator seal problem rather than the pump. Treat a whole-transmission pressure loss and a single-circuit complaint differently.

How to confirm the pump is the problem

Start with fluid level, set at operating temperature through the side fill plug. Then gauge line pressure in Park, Drive and Reverse, cold and hot. Uniformly low readings that sag as temperature climbs implicate the pump or a regulator; one low circuit points elsewhere. Our guide to checking line pressure covers the gauge hookup, and once the unit is open, converter hub and pump bushing wear shows how to read the damage on the hub and bushing.

Fitment

This listing is sold for the 5HP19 family without a specific year range. That family covers the rear-drive 5HP19 in BMW E46 3 Series, E39 5 Series and the Z4, the front-longitudinal 5HP19FL and all-wheel-drive 5HP19FLA (Audi/VW code 01V) in the Audi A4, A6, A8 and VW Passat, and the 5HP19HL and HLA in Porsche 911 and Boxster models. The pump concept is shared, but the cases and converter hubs are not guaranteed identical across BMW, Audi/VW and Porsche units. Compare the casting numbers and bolt pattern on your old pump, or send us the year and VIN before ordering. For a listing dated to a range, see the 5HP19 pump for 1996-2005; more parts are in our hard parts category.

Install notes

• Check the converter hub before you install the pump. A grooved hub will wear the new bushing and seal quickly, and 5HP19 converters are not easily rebuilt, so many shops replace the converter outright.
• Measure bushing-to-hub clearance on the old parts so you understand what failed. Sonnax publishes an oversized bushing for 5HP19 housings whose bore has worn.
• Use a new pump-to-case O-ring and front seal, coat the gears with ATF, and draw the pump into the case evenly.
• If the pump failed, plan on a full overhaul; the 5HP19 master rebuild kit with filter covers the BMW units, and the clutch packs downstream of a weak pump are often burned.
• Refill with the ZF-approved fluid your vehicle maker specifies, set the level hot at the fill plug, and reset adaptations so shift pressures relearn.

Does this pump fit a BMW 5HP19 and an Audi 01V?

The 5HP19 family shares its pump design, but BMW, Audi/VW (01V) and Porsche cases are not guaranteed to take an identical pump. Match the casting and bolt pattern to your old pump, or send us the year and VIN.

Is this pump new or remanufactured?

It is remanufactured and sold as a complete pump assembly, ready to install.

Can a bad pump cause my 5HP19 to go into limp mode?

It can. Low line pressure lets clutches slip, and when the control module sees a ratio error it may lock the transmission in a fail-safe gear. Read stored codes and test line pressure before replacing parts.

What else should I replace with the pump?

At minimum a front seal and the pump O-ring. Inspect or replace the torque converter, and replace the filter and fluid. If the pump failed badly, the clutches usually need attention too.

How much fluid does a 5HP19 hold?

Roughly 9.2 liters when dry. A pan drop takes far less, so always set the final level hot at the fill plug.

• Checking Transmission Line Pressure
• Converter Hub and Pump Bushing Wear
• Transmission Slipping Diagnosis Guide