CriticalVery commonTransmission

Volvo XC90: T6 (2.9 twin-turbo) GM 4T65EV automatic transmission failure

T6 (2.9 twin-turbo) GM 4T65EV automatic transmission failure is a very common transmission fault on the Volvo XC90 on the 2003–2006 cars, and we rate it critical. Putting it right costs $4,000 to $9,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 27 documented faults on the Volvo XC90.

Vehicle: Volvo XC90
Only on: Bi-Turbo / twin-turbo
Engine: 2.9L
Years: 2003–2006
Fuel: petrol
Gearbox: auto
System: Transmission

This page covers the Volvo XC90 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Volvo XC90 faults27 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Turbocharger yet. We would rather show none than show a picture of a different part.

What goes wrong

The headline first-generation XC90 fault: the T6's GM-sourced 4T65EV 4-speed auto simply wasn't strong enough for the twin-turbo's torque and fails early and often - slipping, harsh shifts, overheating and then total failure, frequently between 100,000 and 200,000 km. It was the subject of a US class action that Volvo settled, and there was never a redesigned fix, so surviving T6s are either on a replacement box or living on borrowed time. The 2.5T and D5 use Aisin boxes (AW55/TF-80) which are far better, though the AW55 also dislikes skipped fluid services. For a nervous buyer, the safest advice is to prefer the 2.5T or D5 over the T6 entirely.

What you would notice

Slipping - revs rise without matching acceleration
Harsh or delayed shifts, clunking into gear
Transmission overheating messages or burnt-smelling fluid
Shuddering under light throttle at open-road speeds

How to check it

Where to look. Automatic transmission under the front floor; fluid checks via workshop, not a dipstick

Ask upfront if the transmission has ever been replaced or rebuilt and see the invoice - on a T6 this is the single most important question. On the test drive, from cold and warm, accelerate briskly and feel for slip or flare between every shift. Check the fluid service history. Budget as if the box will need work unless there is proof it was done.

Parts involved: Turbocharger.

What it costs to put right

$4,000 to $9,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the transmission been rebuilt or replaced, and by whom?”
“How often has the transmission fluid been changed?”
“Does it ever slip or flare between gears?”

Now check the Volvo XC90 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

Matthews Volvo Site 'XC90 T6 - Transmissions Fail'
AboutLawsuits 'Volvo Settles Transmission Class Action Lawsuit'
transmissionrepaircostguide.com Volvo XC90 4T65E problems
SwedeSpeed 4T65E XC90 T6 threads

Volvo XC90 buyer questions

Is t6 (2.9 twin-turbo) gm 4t65ev automatic transmission failure serious on a Volvo XC90?

We rate it critical and very common on the Volvo XC90. The headline first-generation XC90 fault: the T6's GM-sourced 4T65EV 4-speed auto simply wasn't strong enough for the twin-turbo's torque and fails early and often - slipping, harsh shifts, overheating and then total failure, frequently between 100,000 and 200,000 km. It was the subject of a US class action that Volvo settled, and there was never a redesigned fix, so surviving T6s are either on a replacement box or living on borrowed time. The 2.5T and D5 use Aisin boxes (AW55/TF-80) which are far better, though the AW55 also dislikes skipped fluid services. For a nervous buyer, the safest advice is to prefer the 2.5T or D5 over the T6 entirely.

How much does it cost to fix on a Volvo XC90?

$4,000 to $9,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Volvo XC90 years are affected?

Our research records this fault on the 2003–2006 Volvo XC90. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.