VW 09G transmission problems: symptoms and fixes

If your automatic Jetta, Beetle or Passat bangs into Drive, shifts harshly or flares to neutral, it's time to look at its transmission: the 09G. It's the automatic in many Volkswagens built since the mid-2000s. In this article we'll explain what the 09G is, which cars use it, its most common problems, how to check it and which parts you need to fix it.

What is the 09G transmission?

The 09G is a 6-speed automatic transaxle for cars with a transverse engine and front-wheel drive. Aisin builds it and calls it the TF-60SN, and Volkswagen has used it since 2003. VW's internal name is AQ250-6F, because it's built for engines with up to 250 Nm (184 lb-ft) of torque. Spec sheets call it a "6-speed Tiptronic": Tiptronic is VW's name for the manual-shift mode on several of its automatics.

Inside, it uses a Lepelletier gear train (a simple planetary set plus a Ravigneaux set), with five clutch and brake packs (K1, K2, K3, B1 and B2) and a one-way clutch. It has sister versions for engines with more torque, such as the 09M (AQ450, up to 450 Nm), used for example in some Tiguan 2.0T models. They share the design but not every part: clutch packs, planetary sets, housings, ratios and final drive change with the car's torque.

Which cars use the 09G transmission?

These are some of the cars that use it in their automatic versions:

• Jetta 2.5, Jetta 1.8T (2014 to 2017) and Jetta 1.4T (2016 and 2017). Not the GLI or TDI, which use DSG.
• Passat 2.0T (2007 and 2008), Passat 2.5 (from 2012) and Passat 1.8T (2014 to 2017).
• Beetle 2.5 and Beetle 1.8T.
• Golf 2.5 and Golf 1.8T (2015 to 2017).
• Some Audi A3 and SEAT León, Altea and Toledo versions.
• Some Mini Cooper automatics, where it's called the GA6F21WA.

Not every automatic VW uses the 09G: depending on the year, engine and trim, models such as the Jetta, Passat, Golf, Tiguan or Audi A3 can have a 09G, a 09M or a DSG dual-clutch gearbox. Before you buy parts, confirm your car's transmission with its VIN, or look the car up in the transmission identifier on the Transmisiones Veinte 07 home page (in Spanish).

Symptoms of a failing 09G

These are the most common complaints with this transmission:

• A bang or delay when you shift into Drive or Reverse.
• Harsh shifts between 1st, 2nd and 3rd, especially when the engine is cold.
• Flaring to neutral: on a shift or while coasting to a stop, RPM rises as if the car were in neutral.
• Slow engagement into Drive.
• Torque converter clutch slip: at a steady highway speed, RPM goes up and down without more throttle.
• Limp mode: the transmission stays in one gear and engagements are harsh.
• Check Engine light on with transmission codes.

Several of these symptoms look alike and can come from different parts, so confirm with a scan tool before replacing anything. Here's more on how the valve body works and its main failures.

Valve body and solenoid wear

This is one of the best-known 09G problems. With use, the bores the valves slide in wear out and leak pressure, especially when the fluid is hot. The transmission computer tries to compensate, and the result is harsh shifts, bangs or slipping. The solenoids also fail from worn bushings or debris buildup.

The 09G valve body has 8 solenoids. Each one controls a different part of the transmission, so the symptom depends on which one fails:

• N88 and N89: on/off shift solenoids. They don't control one specific clutch; they work with the others in several gears.
• N90: K3 clutch.
• N91: torque converter clutch (TCC).
• N92: K1 clutch.
• N93: main line pressure.
• N282: K2 clutch.
• N283: B1 brake.

The six linear solenoids (N90, N91, N92, N93, N282 and N283) can be checked with a multimeter: according to the service manual, each should read between 4 and 8 ohms. If you take the valve body apart, label each one before removing it, because each solenoid goes in a specific position, and don't soak them in solvent.

For example, wear in the K1 circuit can make it flare to neutral as you coast to a stop or engage Drive late, and wear in the K3 circuit causes a bump or delay into Reverse. When converter lockup pressure leaks, the converter clutch slips; and if the problem goes on, the clutch packs can overheat and burn. At that point a valve body alone won't fix it: the transmission has to come apart for new clutches and gaskets.

Before opening it up, ask the dealer whether your car has a software update pending. VW has issued bulletins with new transmission software for harsh engagement and harsh shifts on some 2011 and 2012 Jetta, Golf and Passat 2.5 models, and on 2014 and 2015 Jetta, Passat, Beetle and Golf models.

Why does the 09G flare to neutral?

It flares to neutral when, during a shift, one clutch lets go before the next one applies. If that gap lasts more than a quarter of a second, RPM rises as if the car were in neutral. On the 09G, these are the most common causes:

• Wear in the K1 clutch circuit: neutral while coasting to a stop, or late engagement into Drive.
• A worn or misadjusted K2 control valve: it goes to neutral on the 3-4 shift.
• A linear solenoid that sticks when hot: it shifts fine cold and flares to neutral once warm.
• Burned K1 clutches.

If the computer detects an electrical fault, the transmission doesn't go to neutral: it goes into limp mode. And before diagnosing anything, check the fluid level. Here are more signs of a slipping transmission.

Common 09G trouble codes

These are OBD-II codes the 09G computer can store, grouped by part:

• P0730, P0731 to P0735 and P0729: incorrect gear ratio, in general, in 1st to 5th or in 6th; that gear's clutch is slipping. With P0729, P0734 or P0735, check the solenoid modulator valve.
• P0700: the transmission computer stored a fault and asked for the Check Engine light.
• P0604, P0605 and P0613: internal transmission computer fault.
• P0705 and P0706: shifter position switch (F125).
• P0711 to P0713: fluid temperature sensor (G93), part of the internal harness.
• P0715 to P0717: input speed sensor (G182), the TSS sensor. Here's how to tell if it's bad.

VW also uses its own five-digit codes, so always check the exact description on your scan tool. Sun Transmissions has guides to codes P0700, P0706, P0711 and P0730.

How do you check a 09G?

Start by reading the codes with a scan tool that shows transmission data, especially fluid temperature, which you'll need for the level check.

Then check the fluid. The 09G uses VW G 055 025 A2, a red fluid; some newer versions call for a different spec, so confirm yours by VIN. VW calls it a "lifetime fill", but the fluid does break down with heat and mileage.

The 09G has no dipstick. Check the level like this:

• Car level, engine idling and the shifter in P.
• Watch the scan tool and wait until the fluid is between 35 and 45 °C (95–113 °F). Outside that range the check isn't reliable.
• Remove the check plug at the bottom of the transmission. If fluid drips from the overflow tube, the level is right; if nothing comes out, it's low.
• Reinstall the plug with a new seal.

If you see gold-colored fluid where the engine meets the transmission, it isn't always a leak: a VW bulletin explains it can be factory rust inhibitor, because 09G fluid is red.

After the repair: clear and relearn the adaptations

The 09G computer learns and adjusts the pressure for each shift to make up for wear. If you replace the valve body or solenoids, or rebuild the transmission, those values no longer apply: clear them with a scan tool and let the transmission relearn on a drive, with the fluid at operating temperature and no fault codes. Skip this and it can keep banging even though the repair is fine.

If you replace the whole transmission, it has to be exactly the same version: ratios and final drive change by car, and the computer works with its own. If you replace the transmission computer, code it the same as the old one and run the kick-down basic setting. Here's more on why a transmission needs to relearn after a repair.

Which 09G generation do you have?

Shops talk about first, second or third generation 09Gs, but Aisin doesn't use those names and every seller applies them differently. VW does call the updated 2014-on version "Gen III". To choose solenoids or a valve body, go by what you see on the transmission:

• Linear solenoid size: there are 1-inch diameter (large) and 3/4-inch (small) solenoids. They don't interchange, and neither do their bushings.
• Pressure switches on the valve body: only units built through June 2004 have them.
• Cooler location: bolted to the case and cooled by engine coolant, or remote. The type changes the pan, converter housing cover, valve body and separator plate, and they don't interchange.
• The 2014-on version has redesigned solenoids in a different place, two pass-through connectors and a rectangular cooler. Its wiring is different, so it won't fit an earlier car.

With those details, or the valve body part number, you can choose the right solenoid kit.

Which filter does the 09G take?

It depends on the year and the car: 09G filters differ mostly in the shape of the pickup. According to the TSS catalog, these are the versions and the cars they fit:

Before you order, compare the pickup and the part number with your old filter. If your transmission is a 09M, it takes a different filter: TSS's is the 133710C.

See 09G parts

TSS parts for the 09G

The 09G transmission page lists the TSS parts for this unit: large and small 6-piece linear solenoid kits, N88 and N89 shift solenoids, filters, pans, pan, gasket and filter kits, gasket kits, piston kits, clutches and the internal harness with temperature sensor.

TSS is an aftermarket brand with OEM-comparable quality and quality control on every product. You can buy it from our authorized distributors: in the United States from Sun Transmissions, and in Mexico the full TSS catalog at Transmisiones Veinte 07.

TSS products

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