Ford Territory Gearbox & Transmission Problems

Some Territories of around this vintage experienced a problem with a dud output-speed sensor within the automatic transmission. The sensor could cause an intermittent fault where the transmission wasn’t telling the rest of the car how fast it was going and, in some cases, could cause the transmission to suddenly shift back to first gear. That sounds a lot like your symptoms. Ford reckons it had this problem fixed by early 2013, well before your car was built, but I reckon it’d still be worth a check of the sensor’s operation via an electronic scan.

The other recurring problem with the Territory’s transmission was when the transmission cooler failed internally and the gearbox oil and the coolant became mixed. That destroyed the gearbox both mechanically and electronically in pretty quick time and if that’s your problem, a rebuilt or replacement transmission is the only fix.

As with any automatic transmission problem, the first thing to do is check the level of transmission fluid in the gearbox itself. These shouldn’t need top-ups, but if a leak occurs, they can lose enough fluid to play havoc with the gear selection and drive-transmission processes. Low fluid can cause a loss of drive in any gear, but could also contribute to a valve-body problem where the lack of fluid prevents the correct gear selection process. Low fluid can also mean the clutch-packs and bands can not exert enough pressure to get the car moving.

It's worth noting, though, that this particular transmission has a finite lifespan and a loss of third and fourth gears could be the first sign that the unit is worn out and requires either replacement or reconditioning. A transmission specialist should be your first port of all.

The Territory was sold in pretty big numbers, so finding a replacement transmission either in a wrecking yard or a specialist transmission shop shouldn’t be difficult at all. That’s helped by the fact that it used the same transmission as the Ford Falcon and that car sold in huge numbers over the years.

But before you rush out and buy a new gearbox, make sure the one you already have actually needs replacing. Sometimes, a small problem can cause issues like the ones you’re having, and it’s a simple, cheap fix instead of a complete replacement.

The first thing to check is the level of the transmission fluid. Low fluid level can cause a loss of drive like you’re experiencing, and a transmission shop should be able to diagnose exactly what’s going on. That said, a loss of drive in this particular transmission is often the first sign of a terminal failure.

Transmission fluid should generally be a pretty pink or red colour. If it’s black (and/or smells like burned toast) that suggests that it is way overdue for a change of fluid and a new filter, and also that there could be lots of wear inside the transmission.

Tiny bits of the clutches and bands that control an automatic like yours wear off over time and it’s these that are discolouring the fluid. That fact that they’re black, also suggest they’re burned having been overheated at some point in the past.

A transmission shop should be your first port of call, with instructions to diagnose what’s wrong and work out a strategy from there. If the transmission is badly worn, it may need replacing or rebuilding. But you might be lucky and discover that the fluid is simply old and depleted (from a leak somewhere) and the transmission may recover with a full service. Don’t count on it, however.

The Territory is pretty well known in the fixit trade for having various transmission problems. Perhaps the most common was a failure of the entire transmission due to coolant from the transmission cooler mixing with the transmission fluid inside the gearbox. When that happened, the destruction was fairly complete with ruined electronics and internal hardware as the contaminated fluid could no longer satisfactorily lubricate the gearbox’s many moving parts. A whole new transmission was the usual outcome.

The first sign of this was usually milky transmission fluid (caused by the water mixing with the oil) but by then, the damage was often already done. This was more of a problem with the later model Territories with the six-speed ZF automatic transmission.

If you can't find the dipstick for the automatic transmission, there might be a very simple explanation: It doesn't have one. Many Fords from this era were not fitted with dipsticks, so checking the level is done from underneath the car via the a threaded plug. Not so easy to do at home. The transmission is a sealed system, and any drop in level indicates a problem that needs to be fixed. So the level is worth keeping an eye on, even if that's not so easy to do in cars like this one.

Theories for the dipstick deletion include preventing owners from over-filling the transmission (easier than you might think, since the transmission temperature when you check it is critical) as well as not giving owners the opportunity to top-up their transmission with the wrong type or grade of fluid.

At some point though you have to imagine that cost-cutting also came into the decision.

The transmission in this era of Ford Territories was notorious for suffering a failed transmission oil cooler. If that happened, the coolant would often mix with the transmission’s fluid, causing massive damage to both the electronics and the mechanical components of the transmission. In severe cases, the vehicle could lose drive altogether. A replacement transmission is the usual fix, so it’s an expensive failure.

But the first check to make is of another part of the Territory that is also known for giving trouble. In this case, though, the end result is nothing like as dramatic as it’s caused by damaged or poorly adjusted (loose) selector linkages. A quick tighten or adjustment will have the transmission operating properly again, but you need to ascertain what’s causing your problem in the first place. Don’t forget to check that there’s actually sufficient fluid inside the transmission, too, as low fluid can cause a loss of drive. Most workshops will be able to diagnose either problem pretty quickly.

The first thing to do is get your mechanic to drive the vehicle when it’s hot. Arrange a time and then deliver the car at that time with everything up to full operating temperature. Otherwise, the problem isn’t going to show up when it needs to.

While there are lots and lots of things that can cause this sort of behaviour, it does sound like something in the actual powertrain is the problem. That’s because the shuddering goes away when you drop the transmission into neutral and let the vehicle coast to a stop. If the problem was a wheel, a wheel bearing, axle, brake problem or an out-of-balance driveshaft, the problem would continue even though you were coasting.

You may have a problem with something inside the transmission itself, way too much backlash somewhere in the driveline or a problem with the torque converter. Either way, you need to have your mechanic experience the problem or everybody is simply guessing.

Any time you have oil mixing with coolant, you have a pretty major problem on your hands. In the case of your Territory, it could be that the head gasket has failed, allowing the two fluids to mix, creating the milky murk known in the trade as a 'milkshake'. It’s a bit unlikely but it could be even more serious and your engine may be suffering from a cracked cylinder head or a split cylinder liner. A blown head gasket is a lot more likely, though.

But just as probable is a problem that occurs pretty frequently with this make and model. The Territory’s transmission is cooled via a heat-exchanger that is cooled by the engine’s coolant. If the plumbing on this cooler fails (usually because of friction due to junk inside the tubing) then the engine coolant and transmission fluid can mix and also form a milkshake which you’ll see in the radiator or coolant catch-tank.

Unfortunately, if this is the case, the transmission’s computer and its hardware may also be damaged beyond repair by the coolant diluting the transmission fluid and generally causing havoc inside the transmission.

The best advice is to not drive the vehicle any farther and have it diagnosed by a workshop to see exactly what has happened.

The original slipping could have been caused by low transmission fluid, which would also explain why the unit would not select a gear. That would suggest that the transmission has a leak somewhere, because it’s a sealed system and doesn’t need periodic top-ups.

The danger, however, is that running the unit with a low fluid level has caused damage to the mechanical parts of the gearbox and possibly the torque converter as well. That’s because the fluid in an automatic transmission not only provides the drive, it also lubricates the various bits of the transmission. Not enough fluid means not enough lubrication.

If it was a as simple as low fluid, now that you’ve changed the fluid and taken it back to its correct level, you should have all the gears working again. But the fact that it will only select first and second gears suggests damage has already occurred. This is really a job for a transmission specialist who will be able to accurately diagnose what’s wrong.