Mercury Montego Transmission Problems & Cost | AWF21

The Mercury Montego was equipped with the Aisin Warner AWF21 transmission. But they aren’t without their problems though, so let’s look at some of the most common Mercury Montego transmission problems, look at cost estimates and figure out what you can do about them.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

Mercury Montego Transmission Models

Mercury Montego: AWF21 Transmission

Mercury Montego Transmission Replacement Cost Estimate

Pricing varies by model. To be 100% sure on pricing, have your VIN# handy and use our Get An Estimate feature to look up your transmission by VIN#.

Replacement Mercury Montego Transmission Prices:

What are the DTC codes related to Mercury Montego transmission problems?

Mercury Montego Transmission Recalls

None Found

Mercury Montego Technical Service Bulletins (TSB)

TSB 07-14-7 – Key stuck in ignition / shifter binding condition – AW21 Transmission
2006 – 2007 Ford Fusion – 2006 – 2007 Mercury Milan – 2006 Lincoln Zephyr
Problem – Some vehicles built before 9/4/2006 may exhibit a problem where the ignition key gets trapped in the ignition switch due to a binding shifter button that does not allow the parking prawl to contact the park detect switch. The shifter sliding mechanism may also bind.
Solution – Install new shift knob button

TSB 06-23-12 – Automatic transmission whine between 40 – 60 mph (64 – 97 km/h) 3.0L engine – AW21 Transmission
2006 – 2007 Ford Fusion 3.0L V6 – 2006 – 2007 Mercury Milan 3.0L V6 – 2006 Lincoln Zephyr 3.0L V6
Problem – Some vehicles built before 9/2/2006 may exhibit a noticeable transmission whine during light throttle applications at speeds between 40 – 60 mph.
Solution – Install a mass damper kit on the transmission shift cable near the bulkhead in the engine compartment (part #6E5Z-7L256A)

Common Mercury Montego Transmission Problems

Lack of Response
Leaking Fluid
Low Fluid
Burning Smell
Grinding or Shaking
Whining, Clunking or Humming
Refuses to Go Into Gear
Torque Converter Issues
Valve Body Issues
Transmission Noisy in Neutral
Gears Slipping
No 3rd or 4th Gear
No 1st or 2nd Gear
No Reverse
Dragging Clutch
Trouble Codes / Check Engine Light

Can I drive with a transmission problem?

If your Mercury Montego can still make it up and down the road, you might say “It’s fine, I’ll just drive it until I can get it fixed”. But that is not always a good idea, depending on the symptoms. You see, there are a lot of (very expensive) moving parts inside of a transmission, and if something isn’t right, continuing to drive with a transmission problem could damage something else.

How often does a Mercury Montego transmission need to be replaced?

The overall lifespan of a Mercury Montego transmission largely depends on how well it was maintained. Factory design flaws also factor into this equation, along with how/how hard you drive. But on average, we’ve seen the Mercury Montego transmission last for between 130,000-180,000 miles. A high quality replacement transmission however, can last considerably longer if all of the factory design flaws have been addressed and the vehicle has been maintained.

How are Mercury Montego transmission issues diagnosed?

It is fairly easy to guesstimate what the root cause of your Mercury Montego transmission problems might be, but you won’t truly know unless you have the right tools and experience. A good mechanic or transmission repair center will be able to connect your truck to a computer and find out which diagnostic trouble codes (DTC’s) have been stored. Once they know what to look for, they can perform a visual inspection to verify the problem.

How is a Mercury Montego transmission replaced?

In order to replace your Mercury Montego transmission, the truck has to be lifted from the ground in order to gain access to all of the parts that will need to be unbolted. Then the transmission can be lowered to the ground (typically with a transmission jack), so the new transmission can be installed. Once it is in place, for the 6L80, the vehicle PCM will have to be reprogrammed / reflashed to accept the new transmission using the latest GM subscription.

Recommendations for Mercury Montego transmission issues?

To save time and get back on the road faster, have your 17-digit truck VIN# handy and you can get an online quote for a reman Mercury Montego transmission here, then find a local shop using our Find a Shop guide to install it for you.

How to Solve Mercury Montego Transmission Problems

Solution A: Buy a Used Mercury Montego Transmission

The quickest way to fix your transmission problems is to simply buy a used transmission or used transmission. These can be found at most junk yards, and they often come with a 30-90 day warranty. However, there’s no way to determine the actual condition of the internal components, so you could be spending a bunch of money to have the exact same problems. Plus, that warranty only covers the transmission if it’s defective, not the labor costs that you’ll have to pay.

Solution B: Buy a Rebuilt Mercury Montego Transmission

Another option would be a rebuilt transmission or rebuilt transmission. A local repair shop will remove your transmission, then install a bunch of new parts during the rebuild. The problem here is, the skills and experience of each transmission rebuilder will vary widely from shop to shop, so you could have problems from something that wasn’t adjusted properly. And the 1-2 year warranty might only cover you at certain transmission repair shops, in a specific geographical area.

Solution C: Buy a Remanufactured Mercury Montego Transmission

Many owners depend on their vehicle to commute and get things done. Their gasoline engines are designed to go 100’s of thousands of miles, so it makes sense to invest in a remanufactured transmission.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

What Problem Does Your Mercury Montego Have?

Let us know the year, mileage and problem you’re having as well as any trouble (OBD) codes you’ve found. If you’ve been given a quote or paid for a repair, we’d like to hear about that too!