2008 Mercury Mariner Hybrid engine NHTSA complaints: Engine And Engine Cooling

NHTSA — Engine And Engine Cooling Problems


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
58,862 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2008 Mercury Mariner Hybrid engine problems

engine problem

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2008 Mercury Mariner Hybrid Owner Comments

problem #9

Nov 252010

Mariner Hybrid

  • 70,000 miles


The contact owns a 2008 Mercury Mariner hybrid. While driving at 60 mph, the vehicle stalled and the check engine warning 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 vehicle was previously repaired under NHTSA campaign number: 14V526000 (hybrid propulsion system). The manufacturer was not notified of the failure. The approximate failure mileage was 70,000.

- San Jose, CA, USA

problem #8

Jun 132014

Mariner Hybrid 4WD 4-cyl

  • 41,000 miles
The contact owns a 2008 Mercury Mariner hybrid. The contact stated that while driving approximately 50 mph, the vehicle suddenly stalled. The contact indicated that after the incident the high temperature sensor light illuminated. The vehicle was not diagnosed or repaired. The manufacturer was notified of the defect. The failure mileage was 41,000. Updated 08/27/14 the consumer stated the coolant pump was the cause of the failure. The vehicle was repaired. Updated 09/5/2014

- Boulder, CO, USA

problem #7

Sep 062011

Mariner Hybrid 4-cyl

  • 51,000 miles
This has occurred twice. The first time, (9-6-2010), driving in bumper-to-bumper traffic on the freeway- the light, "stop safely now" comes on and you cannot use the gas pedal and you have to try to get to the shoulder safely as the car has no power. I waited for half an hour and restarted the car and was able to get to where I had to go. Took it to dealer and they couldn't find anything wrong with it. The 2nd occurrence (March 31, 2012), same thing happened except I was on the freeway with everyone going at least 65 miles per hour and had to get to the shoulder without any power. Took it to dealer and they said it was a coolant pump problem. I went online and there are hundreds of complaints about this problem. This should be a recall issue and I shouldn't have had to pay for this. Extremely dangerous. Could so easily have been hit by oncoming traffic. Scary experiences.

- Santa Monica, CA, USA

problem #6

May 232011

Mariner Hybrid 4-cyl

  • miles


We purchased a Ford certified 2008 Mercury Mariner hybrid less than two years ago. According to Ford, a Ford certified¯ vehicle has been passed a 172 point inspection. We have been driving this vehicle on the highway and have experience a stop safely now¯ warning on the dash, accompanied by the engine shutting off, and this seems to happen at speeds of 50+ mph. I was driving 70 mph in the middle of a congested 4 lane highway traffic while this happened to me recently. My car ceased to accelerate, and I had to weave out of the center lanes, swerving to an exit, going up on an exit ramp, without the ability to accelerate. We have contacted Ford through their website customer service number, and the representatives just tell us to take it to a Ford dealership. After fixing the problem that their technician at our local dealership told us to fix, our vehicle did the very same thing a month later. We were told that we needed to replace the fuel throttle body. We've also replaced the hybrid battery filter¯ as per the company's recommendation. We want some attention brought to this matter. I feel I no longer trust that the technicians at the Ford have the knowledge to deal with this issue. After some searches online, I've found we're not the only ones with this problem. I don't know how Ford can just pretend this isn't a serious issue. What will it take to get their attention? the fact that they're endangering the lives of people by not recalling this vehicle, and the lack of accountability is shocking. How can Ford can get away with releasing these unsafe vehicles and exposing many lives which could result in deaths. After many calls to Ford customer service, and speaking with the local Ford techs, my frustration lies at not having a clear answer and no direction. This is clearly unsafe for anyone to drive and something needs to be done.

- Mission, TX, USA

problem #5

Sep 052011

Mariner Hybrid

  • 66,000 miles
The contact owns a 2008 Mercury Mariner hybrid. The contact stated that while driving approximately 65 mph, the stop safely now warning light and the temperature light illuminated on the instrument panel. The vehicle then suddenly stalled. The contact was able to restart the vehicle. The failure occurred intermittently and only when driving at highway speeds. The vehicle was taken to the dealer for a diagnostic test. The technicians stated that there may be a failure with the cooling pump, but would inspect the vehicle to verify the failure. The vehicle was not repaired. The approximate failure mileage was 66,000.

- Hermosa Beach, CA, USA

problem #4

Aug 112011

Mariner Hybrid 4-cyl

  • 91,355 miles
On Thursday, August 11, 2011 our 2008 Mercury Mariner hybrid shutdown while traveling 67-70mph on I-39 in the passing lane next to a semi. Had to cut across the interstate onto loose gravel, creating a dangerous situation for multiple drivers. Had just had this 'fixed' by dealership two weeks before. I was told by the dealership at that time that it needed a chip upgrade, which was done. Unfortunately, this was not the needed 'fix' obviously. I was able to restart it like I had before, but could not drive above 60-62 mph in order to keep vehicle running. Just took it into dealership again today, and they had not heard of this problem on any other hybrids.

- East Peoria, IL, USA

problem #3

Jul 072011

Mariner Hybrid

  • 77,400 miles


The engine abruptly stopped while I was traveling 65 mph. The car was towed to a Ford dealer who diagnosed the problem as the "motor electronics cooling pump." The part was replaced but was not covered by the warranty. Ford issued a technical service bulletin in November 2008 concerning this problem, so Ford has been aware of this danger for years.

- West Chester, PA, USA

problem #2

Feb 062011

Mariner Hybrid

  • 65,000 miles
Vehicle's gas engine shut off on the freeway at 65 mph without warning leaving only the electric motor to power it. The reduced the maximum speed to 25 mph. Dealer said failure of the motor electronics cooling pump caused the loss of power.

- Santa Rosa, CA, USA

problem #1

Jan 042011

Mariner Hybrid

  • 68,000 miles
The contact owns a 2008 Mercury Mariner hybrid. While driving approximately 70 mph the vehicle stalled and a stop safely now message displayed on the instrument panel. The vehicle was pulled over, turned off and upon restart the contact was able to continue driving normally. The failure continued to recur during the duration of the drive. The vehicle was not taken to a dealer to have the failure diagnosed. The failure and current mileages were 68,000.

- Kokomo, IN, USA

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