09G Pump 2003

A 09G that takes a second or two to grab Drive or Reverse, slips in every gear once it is warm, or whines in step with the engine is often running on a worn front pump. This is a remanufactured pump for the earliest 09G production, listed for 2003. The 09G is Volkswagen's code for the Aisin TF-60SN six-speed, and 2003 is right at the start of its run, so this page spends extra time on making sure the transmission in your car is really a 09G before you order.

What the pump does in a 09G

The pump bolts to the front of the case behind the torque converter, and the converter's impeller hub drives it through slots in the hub. That means it spins at engine speed whenever the engine runs, in every range. Its output feeds the pressure regulator first, and from there the converter, the cooler and the lube passages. The valve body's linear solenoids then shape that line pressure into individual clutch applies. They can trim pressure down, but they cannot create flow that the pump is not delivering, which is why a weak pump shows up as a problem in every gear instead of one.

The pump housing also carries the stator support and the sealing ring lands that feed the clutches behind it. On a high-mileage early unit those ring lands and the bushing wear along with the gears, and the leak-down from that wear costs as much pressure as worn gear teeth.

Symptoms of a worn early 09G pump

• Slow engagement into Drive and Reverse, getting worse as the fluid heats up and thins out.
• Slipping or flare on every upshift, not just a single gear change.
• A whine that rises and falls with RPM in Park and Neutral, not only while moving.
• Fluid that runs hot or smells burnt, because low pump output also cuts converter and cooler flow.
• Slip or gear ratio faults stored in the transmission control module after repeated flare.
• Bushing material or fine metal on the pan magnet at the last service.

How to confirm the pump before you buy

Rule out fluid level first. The 09G has no dipstick and is checked at a plug at a set fluid temperature, and a unit that is simply a quart low acts exactly like one with a worn pump. Compare what comes out of the pan with our ATF color and smell chart. If the level is correct, a line pressure reading that is low in every range points to supply: pump, regulator or a big internal leak. Low pressure in only one range is a clutch circuit or a valve body bore, not the pump. Our Aisin slipping under load guide walks through telling those apart, and the Aisin overheating prevention guide covers the heat side of the same failure.

Fitment

This pump is listed for 2003 09G transmissions. Because 2003 is the first year of the TF-60SN family, be careful here. Most 2003 U.S.-market Volkswagens with an automatic used the older four-speed 01M, not the 09G; if that is your car, you need the 01M pump instead. The TF-60SN is also sold as the 09K and 09M, and BMW and MINI call it the 6F21WA, and Aisin changed internal parts between early and later units. Read the transmission code from the build sticker or the case, compare the pump's bolt pattern, stator shaft and ring grooves with your old pump, or send us your year and VIN to check before it ships. If your car is a 2006 or later model, the 2006-2013 09G pump is listed for those years. Everything else for this unit is on our Aisin transmission parts page.

Install notes

• Install a new front seal and pump O-ring, and new stator shaft sealing rings if the old ones are hard or worn.
• Coat the gears and bushing with clean ATF before assembly so the pump primes on first start.
• Draw the bolts down evenly in a cross pattern so the housing seats flat and the gears turn freely.
• Check the converter hub for wear at the drive slots and the bushing journal; a damaged hub will destroy a new bushing quickly.
• Flush or replace the cooler, and replace the filter with the 09G filter and gasket kit.
• Fill with the VW-approved ATF for the 09G and set the level at the check plug at the specified temperature, then reset adaptations as described in our adaptive relearn guide.

If the old pump failed from heat and debris, the clutch packs usually took damage too. Rebuilding the whole unit with the 2003-2013 09G master rebuild kit while it is on the bench avoids pulling the transmission twice.

Did VW use the 09G in 2003?

2003 is the very start of the TF-60SN (09G) family. Most U.S.-market 2003 Volkswagen automatics were the four-speed 01M, so read your transmission code from the build sticker or case before ordering, or send us your VIN.

Is the 09G the same as the 09K, 09M or 6F21WA?

They are all versions of the Aisin TF-60SN. The family name is the same, but internal parts changed between early and late units, so match the pump to your old one rather than going by the name alone.

What should I replace with the pump?

A new front seal, pump O-ring, stator shaft sealing rings, a filter and gasket, and fresh VW-approved ATF. Inspect the torque converter hub and flush the cooler so old debris does not wear the new pump.

Can a low fluid level look like a bad pump?

Yes. The 09G has no dipstick and is set at a check plug at a specific temperature. A unit that is low on fluid gives the same delayed engagement and slipping, so verify the level before replacing parts.

Do I need a scan tool after installing it?

Plan on resetting the transmission adaptations and doing a road test so the control module relearns clutch fill times with the new pump's pressure.

• Aisin Slipping Under Load
• ATF Color and Smell Diagnosis Chart
• Aisin Overheating Prevention
• Adaptive Relearn After a Valve Body or Rebuild