Automatic Transmission Control Module Problems of Mercury Mariner Hybrid

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.

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I was traveling west at about 70 mph in the left lane on I-66 out of washington, DC with four people in the car. Suddenly, the engine died and we were left with only the electric motor on the hybrid and a dash warning of a red triangle and the statement "stop safely soon. " the car quickly lost power to about 30 mph and we struggled to get across the four lanes to the shoulder. The electronics in the car still operated (radio, dash lights, etc. ), but the gas engine stalled. Once on the shoulder, we stopped. The Ford owner's manual told us to turn the car off and try to re-start. We did this and the car re-started. We started to drive, but the car did the same thing after about 5 minutes. The car did the same thing on about 5 different occasions until we could get to an exit that had businesses. The Ford dealer in this area (away from my home) states that the electronic cooling pump needs to be replaced. Although I understand that parts fail, my complaint is that Ford should not tell owners to re-start the car and try to proceed on. It is dangerous when it continues to fail and you don't know where the next failure might occur (on a bridge, in a construction zone, on a busy, fast interstate). Moreover, having reviewed complaints on this site and elsewhere on the internet about Ford hybrids, I know that many others have experience this situation where the car engine stalls at highway speeds due to various problems (e. G. , the electronic cooling pump, bad sensors, or a corrupted pcm).

On I-66w vehicle lost engine power at highway speed. Displayed stop safely now and master vehicle electrical hazard warning lamp. The incident was extremely harrowing for the driver as the power cutoff was unexpected and immediate. Coasted to shoulder. A restart, per the owner manual, was attempted but did not work. Transported on flatbed to Ford dealership. Dealership stated hybrid battery harness, hybrid cooling fans, and throttle body needed to be replaced and pcm reprogrammed for $1900 to €œfix issue. Owner requested a new 12v front battery and warning ceased. Owner decided to do some research and test drive short distances. On 5/24 the engine cut off in an office parking lot. Vehicle was able to be restarted and go 4 miles back to residence after the carpet covering the hybrid battery was pulled up and the cabin a/c turned to high in an effort to cool the battery area (it did not feel hot but the owner believed if a temp reading was the cause a few degrees cooler might help). A wealth of info was found indicating this was a known problem and had multiple Ford technical service bulletins issued (09-18-6 Sep 09 hybrid systems - red triangle on/dtc p0a27 set€�). The owner compiled a list of 88 complaint numbers on the NHTSA site that indicate substantially similar experiences from 2005-2008 Ford escape hybrid / Mercury Mariner Hybrid owners. Believe root cause is a design flaw in the pcm s/w that removes engine power when a minor deviation from the nominal battery temp range is sensed. Likely contributing issue is a poorly designed hybrid battery cooling system (battery harness, battery cooling fans, mec pump, blend door, relays). The NHTSA is urged to open an investigation into the stop safely now/master vehicle electrical hazard engine shutdowns. Vehicle is not repaired and can be made available for inspection.

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