The contact owns a 2010 Mitsubishi Lancer evolution. While driving highway speeds above 40 mph, the vehicle became very unstable and 'four wheel drive disabled' displayed. The vehicle was taken to nimay Mitsubishi (1011 kennedy ave, kilometer 2.5, 787-622-0200) where it was diagnosed that the all wheel control hydraulic unit failed and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 41,000.

- San Juan, PR, USA

Bad injector caused cylinder failure or valvr constant valve tick. Blown spark plugs caused piston meltdown causing for the pistong rod to shoot throught the block cause a fire to the engine.. luckly I stop the fire took it to a delaership to verify the cause of the damage but the technicinas told me that theres nothing they could do because the battery die there for it reset the computer module erasing all the data with the probable cause and nothing was done after that.. bought a new engine and now after 20,000 miles I get the same issue but Mitsubishi dose not wanna be resposible for a replace engine to which they replace.

- Maple Shade, NJ, USA

On-dash warning light of "4WD system service required" came on. This warning is indicative of a active center differential (acd) pump failure, generally due to corrosion from treated winter road surfaces and/or the inability to handle cold-weather climates. Car was previously serviced under a technical service bulletin (tsb) to delay activation of the acd pump for this exact reason 2 years prior to failure. Mitsubishi has yet to correct this manufacturing defect and is currently refusing to honor warranty service of failed pumps under their 5-year / 36,000-mile powertrain warranty, stating that the pump is not required for the vehicle to operate safely and properly. In contrast, a working acd pump directly effects the vehicle's handling, traction & steering - and all 3 driving parameters immediately behave differently when the pump shuts down in self-protection mode or has failed completely. This vehicle has a driver-selected setting for tarmac (pavement), gravel/rain & snow conditions - these settings are completely disabled when the acd pump has failed, or is failing (on-dash warning with pump in self-protection mode). This issue effects several models (lancer, Lancer evolution, ralliart, etc.) from model year 2008 to 2014, and hundreds of instances of this issue have been documented in online forums (and probably several-fold that amount that haven't been discussed online). Please look into this issue immediately, thank you.

- Maple Shade, NJ, USA

Transfer case in this car omits a loud whining noise when driving forward. Noise increases in volume the faster the car is going. This whine is due to the wearing of the gears because of a faulty design. When the transfer case whine happens, it has a high probability of locking up which will cause all wheels to stop spinning potentially causing a serious accident and possibly death.

- Watsonville, CA, USA

While driving normally the message "4WD system require service" came up. I bought the car used 40K miles and now it only has 43K miles. I have driven mildly since I bought it and have never abused the car. I heard it's caused by ayc acd pump failure, acd C161E.

- Des Plaines, IL, USA

Acd C161E was read in the ECU. It's ayc acd pump failure. I didn't drive hard. I drove normally which I usually do. And 4WD service required comes on. I searched a lot about the issue. Mitsubishi should have a recall about this its a common problem for evo I read.

- New Milford, NJ, USA

Active yaw control pump that is part of the car's all wheel control system is failing. Pump is not covered by manufacturer power train warranty even though it's part of the power train. Due to location of the pump, it gets sprayed with water on the road. This caused the pump to fail prematurely due to corrosion.

- Chicago , IL, USA

The acd / ayc pump failed. Can be dangerous to lose AWD system. Not covered under warranty.

- Pittsburgh, PA, USA

While driving the vehicle in warmer weather, a warning (4WD system service required) is displayed on the dash and the S-awc AWD system is disabled. The active center differential and torque biasing rear differential are disabled, which greatly reduces handling and causes the vehicle to react differently than normal in emergency situations. This is the result of a failing acd/ayc hydraulic pump. Mitsubishi will not cover these pumps under the power train warranty, even though it is a very common problem. The pumps corrode internally and are unable to build and maintain pressure.

- Barberton, OH, USA

Started up one day and went to drive it and the all wheel drive pump had failed, caused a significant change in the handling of the vehicle.

- Hagaman, NY, USA

The contact owns a 2010 Mitsubishi Lancer evolution. The contact stated that NHTSA campaign number: 13V446000 (power train) had surpassed a reasonable time for repair. The dealer was contacted for repair but had not repaired the vehicle in a timely matter. The contact stated that the dealer was unwilling to give a specific time frame when the repair would have been completed. The manufacture was contacted. The contact had not experienced a failure.

- Victoria, TX, USA

Indicated possible clutch failure/clutch pedal sticking issues to local dealership. Clutch went out before I was able to bring the vehicle in for service. I was charged $2700 out of pocket for a component that should have been covered under my warranty. I was issued a safety recall just recently for faulty clutch master cylinder issues for Mitsubishi motors. During my arbitration with the dealership back in November 2012, the dealership had deemed there was no manufacturer defect, when in fact there was a component that was affecting the proper engagement and disengagement of my clutch. I am currently exercising all avenues in seeking a refund for repairs. When I spoke with Mitsubishi they told me that its is not part of the same assembly when indeed it is; sharing the same fluids and lines this component was the sole failure point resulting in my power train damage.

- Kapolei, HI, USA

The S-awc (super all-wheel control) light came on and was taken to the dealership that same day. Mitsubishi flashed the ECU and the problem was fixed. I recently noticed the light blinking while the vehicle is being operated. I contacted my local dealership and they informed the part is not covered by drive train warranty and my vehicle is not covered because it older than 3 years. The vehicle was purchased new in January 2010; this makes it 3 years 10 months old at time of incident with less than 36K on the odometer.

- Saugus, MA, USA

4WD service required light appeared. Lights stays on for a few days. Went to Mitsubishi dealer service and awc pump has failed. Im at 50,000 miles and car is 4 years old, so im with in the 5yr/60K mile drivetrain warranty, and warranty will not cover it. It is obviously a drivetrain problem. Let alone it has happend frequently to these cars.

- Havre De Grace, MD, USA

Turning into a parking lot and I received a "service AWD system" message. Caused by the acd/ayc pump being faulty which is apparently a known problem with these cars as corrosion happens to the exposed pump. Options include a $2000-3000 replacement of the pump or rebuild one and hope it doesn't happen (which might since it is exposed) again. Really hope Mitsubishi recalls this item since it is a common problem with all evolutions.

- Dartmouth, MA, USA

On-dash warning light of "4WD system service required" came on. This warning is indicative of a active center differential (acd) pump failure, generally due to corrosion from treated winter road surfaces and/or the inability to handle cold-weather climates. Car was previously serviced under a technical service bulletin (tsb) to delay activation of the acd pump for this exact reason 2 years prior to failure. Mitsubishi has yet to correct this manufacturing defect and is currently refusing to honor warranty service of failed pumps under their 5-year / 36,000-mile powertrain warranty, stating that the pump is not required for the vehicle to operate safely and properly. In contrast, a working acd pump directly effects the vehicle's handling, traction & steering - and all 3 driving parameters immediately behave differently when the pump shuts down in self-protection mode or has failed completely. This vehicle has a driver-selected setting for tarmac (pavement), gravel/rain & snow conditions - these settings are completely disabled when the acd pump has failed, or is failing (on-dash warning with pump in self-protection mode). This issue effects several models (lancer, Lancer evolution, ralliart, etc.) from model year 2008 to 2014, and hundreds of instances of this issue have been documented in online forums (and probably several-fold that amount that haven't been discussed online). Please look into this issue immediately, thank you.

- Butler, PA, USA

Every Mitsubishi lancer evo X keeps having the same problem with our acd/ayc pump failure that will cost me/owner a staggering 2000 to 3000 dollars to fix. This is clearly show how the part is really weak and should be under warranty to fix it. Please help us have the Mitsubishi pay for this crappy part included on an expensive car. Hope you here my voice.

- Mt Prospect, IL, USA

Bought my vehicle as a certified pre-owned vehicle with 37,213 miles on it. At 43,000 miles, vehicle began having malfunctions with the all wheel control system and electronic stability control hydraulic pump. This should be an item covered under the 5 year/60,000 mile warranty, however, Mitsubishi states that it is not covered, even though it is part of the power-train, and required to work for vehicle stability and safety. Mitsubishi has continued to refuse to warranty the pump. This is not an isolated issue, and there have been dozens, maybe hundreds of other cars with the exact same malfunction, many of these were turned away by Mitsubishi even while they were under the power-train warranty.

- Silver Spring , MD, USA

Bad injector caused cylinder failure or valvr constant valve tick. Blown spark plugs caused piston meltdown or changing of spark plugs every 20K miles transmission is notty will not go into gear sometimes, diff pins in transmission just come out and the car will not go into any gear. Here is a poll thats on the forums for the evo's view poll results: Evo X transmission problem poll notchy, grinding, or difficult to engage gears (all the time) 471V otes 41.72% notchy, grinding, or difficult to engage gears (only when car is cold) 389 votes 34.46% difficult to engage reverse gear (cold or warm) 79 votes 7.00% no problems at all 190 votes 16.83% voters: 1129. You may not vote on this poll all these problems are costing countless evo owners to buy a new motor cause it blew, buy a new transmission or have jack's transmission rebuild it for them. The articles is down below about the crunch of the tranny and how they fix it. www.jackstransmissions.com/collections/performance-rebuild-evo.

- Dale City, VA, USA

The contact owns a 2010 Mitsubishi Lancer evolution. While stopped at a traffic stop, the contact moved the clutch in order to accelerate but the vehicle would not respond. The vehicle was taken to the dealer for diagnostic testing where the technician stated to the contact that the clutch would have to be replaced. The vehicle was not repaired. The approximate failure mileage was 4,000.

- Central Islip, NY, USA