Battery Propulsion System Problems of Mercury Mariner Hybrid

Car has been rock solid reliable up until 3 weeks ago. Driving normally on city streets the car abruptly shut down the hybrid and ice propulsion units. Steering froze up and it was like putting the brakes on it stranded me in the middle of traffic causing delays for other drivers and a dangerous obstruction. The car has no limp mode to allow for safely getting out of traffic. It had to be towed. Ford dealer has had car for 3 weeks and are still uncertain as to what caused the unsafe shutdown.

See all problems of the 2008 Mercury Mariner Hybrid 🔎.

We bought vehicle in Jan, 2018 from a private party, as a work vehicle for my husband, who is a usps rural route carrier. Two weeks after purchase, the anti-lock brake light went on, and the car would not stop when it was supposed to, which was very dangerous in winter. We believe the prior owner knew about this. The light would just go on & off with no pattern. About 1 1/2 months later, he was driving on a 2 lane hgwy (55 mph) delivering mail. He went to pull forward but the car made a brief noise and then everything just stopped working. The car wouldn't start, no electrical or lights, he could not even roll the vehicle by himself to a safe place w/out help. The electrical and propulsion simply stopped working; period. We ended up dragging it home. Dealership gave est. Amt of repairs around $18k. I found the recall in 2014 (14s19) for the same thing. The mec pump was replaced in 2014, with a "supplemental" fix in 2015 same issue. This is the exact same issue as the previous recall, which neither Mercury or any dealership wants to honor. I'm guessing there are more hybrid mariners w/ similar issues, but not enough to issue a follow-up recall. So here we are stuck in car repair purgatory. I do believe they should honor the recall now and fix the pump and replace the hybrid battery. Not sure about the brakes, but I have seen a lot of complaints about them as well - again, not enough for a recall, which again. Purgatory. My husband was very lucky. Had it been a diff time of day there would have been much more car & semi-truck traffic on the hwy (speed limit is 55) and with him literally just stopped dead in his tracks, there surely would have an imminent risk of a serious rear-end collison, with potentially deadly injuries. I am looking for help, assistance, guidance and anything else from any source possible to resolve this issue. We are at our witts end!!.

2008 Mercury Mariner Hybrid was going 20mph on electric motor in traffic when triangle warning light came on and the stop safely now sign displayed. The vehicle gas engine did not come on and I had to pull over to the side. I place the car in park and turn off the engine. I restarted the engine and the warning light disappeared. I took it to the Ford dealership and they ran a diagnostic on it. They indicated it was the throttle body on the car that needs to be clean or replaced, and the pcm needs to be reprogrammed. I replaced it. This is after I took it to the Ford dealership to fix the two recalls for this vehicle - electric steering control and electric coolant pump for the hybrid battery. I don't know if this will fixed the stalling issue since other vehicle owners indicated this problem persists, only time will tell. If this is a persistent problem please issue a recall since losing propulsion in traffic is not safe.

The contact owns a 2007 Mercury Mariner Hybrid. The contact received notification of NHTSA campaign number: 14v526000 (hybrid propulsion system) however, the part needed to do the repair was unavailable. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure.

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This would be the second un-warned total loss of power on a freeway. Having coasted out of traffic on the first unwarned engine / propulsion system shut-down in fast-moving freeway traffic, managed to find wide-enough section of outside shoulder to come to a stop. But being stuck in 10pm darkness on a narrow shoulder was too dangerous to consider remaining there. Once stopped, I shifted the transmission to park, cycled ignition off then to start ? engine restarted, dash warning lamps came on- then cycled off normally, engine ran smoothly. Note: the only way to attempt to restart the hybrid drivetrain is to shift the transmission into park . . It doesn't work in neutral . . And there was no way I was going to try to put the trans in park in 72-75 mph freeway traffic in 10pm darkness. Accelerated moderately into merging lane, entering gap in n/b traffic to re-enter I-5 traffic ? hoping to get past sr-2 to more-familiar exit ? within 2 minutes, and at speed ~ 55 mph ? drive train died again (same warning tone and light. . . And same "too little too late" stop now warning text). Again had to hunt for a wide-enough section of outside shoulder to stop and take stock of dangerous situation. Shut off engine, moved trans into park tried restart - again, engine started and settled to normal operation - no warning lights remained on. Able to re-enter traffic and transition off I-5 fwy . . But only escape was to another freeway (sr-2). Kept speed below 45mph on that freeway until able to exit freeway. This was the second un-warned total loss of power on a freeway.

Tl- the contact owns a 2008 Mercury Mariner Hybrid. The contact stated that her vehicle was repaired under NHTSA campaign number: 14v526000 (hybrid propulsion system). While driving 60 mph, the vehicle stalled without warning and the check engine light illuminated. The contact was able to restart the vehicle; however, the failure recurred. The vehicle was taken to a dealer where it was diagnosed that the coolant pump needed to be replaced. The vehicle was repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 70,000. Ed.

On-freeway gas engine/electric motor shut-down. Driving in morning rush-hour traffic approximately 15 minutes after cold start in 60-degree weather, both the gasoline engine and the electric motor propulsion systems shut-down together without prior warning while the vehicle was in motion - "stop safely now" was the `too-little-too-late' info on the instrument panel. Neither power mode would restart with trans in neutral (I refused to try cycling ignition key to off, and risk steering lock). Fortunate to coast onto shoulder, where I had to move gear selector to park, turn ignition key full-off and then back to start, at which time normal operation resumed. Total loss of both power sources while in-use on a freeway and unable to re-activate without shifting transmission into park is absolutely inexcusable and unacceptable!.