2005 Mercury Montego: check engine light

Filed Apr 5, 2016 · Acceleration, Engine · 150,000 miles · OH

Tl* the contact owns a 2005 mercury montego. While driving 15 MPH around a corner, the vehicle jerked and the check engine and fail safe mode warning lights illuminated. The vehicle was taken to the dealer where it was diagnosed that the throttle body control unit failed and needed to be replaced. The vehicle was repaired; however, the failure recurred. The manufacturer was notified of the failure. The failure mileage was approximately 150,000.

Filed Jan 12, 2016 · Electrical · 85,000 miles · WA

Dash board gauges and controls. When driving our 2005 montego all of the dash instruments and gauges will go out, and you loose some power, the rear lights go on. This can happen at any moment when the vehicle is in motion, on the interstate, slow speeds. To replace is quite expensive, but in doing some research I have come across thousands of complaints on the same issue, and it's extremely scary and concerning that a safety recall has not been done. You can turn it off but doesn't always reset and when it does the engine light stays on. This occurs while the car is in motion.

Filed Dec 19, 2015 · Electrical · 223,000 miles · MI

Started 2005 montego to pick up fianc from work, got back inside after brushing snow off the car and I pressed the throttle to drop the idle speed, all of the gauges on my instrument panel went black (tach,speed,fuel,water temp,AC/heater), my reverse lights came on, my stereo had really loud static coming through it and my wipers/heater stopped working. Came back a few hours later and gauges worked but check engine, transmission and charging systems lights were on. I put it in gear because I thought the issue was gone and as soon as I got to about 1500 RPM my gauges went black so I stopped and when the idle speed dropped back down my gauges came back on. I tried my headlights and they go out every time my gauges go out, which is any time I get over 1500 RPM.

Filed Aug 11, 2015 · Electrical, Lights · 142,691 miles · MO

Parked car at home after dropping daughter off in town car performed normally. Five hours later went out to pick daughter up. Started car and had no speedometer, odometer, tachometer, no cluster panel at all. No lights on panel, A/C would not function and backup lights came on and stayed on. The wrench symbol light came on at this time. I tested the car daily with the same results, until tuesday, august 11th. I had an appt to take it in to a ford dealer to have it diagnosed. When I started the car at this time, the cluster panel and A/C were working, the backup lights were off (except when in reverse) and the wrench light was now off. However, now the check engine light was on. Diagnosis at the dealership was that the cluster panel was bad and was sending incorrect codes (p0462 & p2067) causing the check engine light to come on. Since those codes are associated with the powertrain control module it could cause the engine to stall at any time.

Filed May 28, 2014 · Engine · 126,600 miles · IN

Upon entering traffic flow on I-94 westbound near new buffalo michigan the acceleration of engine quit instantaneously and the engine warning light lit up reading something about a fail safe mode. After coasting back across two traffic lanes to the side of road I shut the engine down. To keep from getting stranded along the highway and since the engine info light read all systems were ok after waiting a few minutes I restarted the motor and it ran ok. I stayed in the slow lane so I could pull off the road if it happened again which it didn't . The next day on county road 500n in indiana it did it again.

Filed Feb 26, 2014 · Transmission · 117,000 miles · PA

Drove car home day before, seemed fine. Went out next morning, car started fine, put into gear, car would not move. Check engine light, check transmission light, check traction control light all came on. Also the "wrench" light came on. Throttle will not work properly, won't let engine rev up. Saw the class action suit for these ford CVT transmissions online, want to sign up for it as these transmissions are dangerous and defective, a well documented fact.

Filed Oct 9, 2012 · Transmission · 40,525 miles · DE

Tl* the contact owns a 2005 mercury montego. The contact stated that while driving 35 MPH, the check engine and transmission light illuminated and immediatetly after the vehicle stalled. The vehicle was taken to a dealer for a diagnostic test who diagnosed that the mechatronics unit needed to be replaced. The dealer replaced the mechatronics unit but the stalling continued. The vehicle was taken back to the dealer who stated that the transmission needed to be replaced. The failure mileage was 40,525.

Filed Jun 7, 2012 · Airbags, Electrical · 89,000 miles · OH

The instrument gauge on my 2005 mercury montego just went "dead". Nothing registered, so there was no reading on my speed, engine heat gauge, fuel level, or tachometer. This happened once in early spring of this year (2012), but did not repeat until recently. It is now june and the same thing has re-occurred about 10 times in the past two weeks. After turning the car off and restarting, this sometimes (but not always), "fixes" the problem. Most recently, if the gauges do work, the "check engine" light turns on. The airbag light stays on, and the awd malfunction message displays in the information panel until I hit the reset button. From a safety perspective, is this a short in the system or is my airbag really malfunctioning? And how do I know my speed other than to guess?

Filed Nov 4, 2011 · Fuel system, Transmission · 53,018 miles · CA

The check engine light came on. I took the car in for service. I was told that the throttle body needed to be replaced. That cost me $736.83. This was done on 10/06/2010. Now again the check engine light has come on so I took the vehicle in for service. I am now told that the throttle body has gone bad. This time the estimate is $950.00. My mileage is 90,361. Now a little more that a year after the first repair I need to perform this repair again. I believe a recall needs to be forced on the ford motor company for defective parts that are being installed on their vehicles.

Filed Aug 25, 2011 · Electrical · 45,000 miles · TN

Tl* the contact owns a 2005 mercury montego. The contact noticed that all of the instrument panel gauge readings decreased to zero and the check engine light illuminated. The contact heard a clanking sound before the failure occurred. The vehicle was shut off and restarted and the gauges reset to the accurate readings. The vehicle was taken to the dealer for diagnostic testing. The technicians were unable to duplicate the failure. The vehicle was not repaired. The approximate failure mileage was 45,000.

Filed Jul 1, 2010 · Electrical, Transmission · 50,327 miles · CA

On june 22, 2010 I noticed the engine warning light come on. About 1/2 mile further the transmission starts bucking and jumping. The 2005 mercury montego was having a difficult time pulling a 15% grade, once to the top everything smoothed out. Then 2 miles further another hill came. The 2005 mercury montego started to buck and jump once again. I made it home that evening. The next day I called the dealership and explained the situation. It was decided to take the vehicle in to be looked at. What was found was an instrument cluster defect that was changed out after a four day waiting period to receive the part. Then the service advisor called and stated that the transmission control module (TCM) was defective. This part is not covered by my warranty! It will cost me $1,700.00 to replace this part. Now I an finding that there are a lot of complaints like this for this particular year and model. So my question is..how many people have to die before the federal safety agency will pressure the ford motor company into making their cars safe to operate on the american roadways? Who is willing at the federal safety agency to put their family in an 2005 mercury montego knowing that the transmission control module could malfunction at any time causing their family to be stranded on a freeway or in a busy intersection? Come on and step forward you can borrow my car!

Filed Oct 27, 2009 · Electrical · 54,956 miles · FL

Tl* the contact owns a 2005 mercury montego. While driving 35 MPH the temperature gauge went from normal to zero and then back up to normal. The vehicle was taken to the dealer and the wire that caused the temperature gauge to malfunction was replaced. The failure could cause high voltage in the electrical circuit, which could have lead to a fire. The current mileage was 57,080. The failure mileage was 54,956. Updated 11/13/09.*lj the consumer also stated the engine light illuminated as well. The mechanic found three codes stored for the engine coolant temperature circuit. They indicated an intermittent high voltage in the ect circuit. The freeze frame date showed 40 degrees indicating the circuit was open at some point. Extensive testing was done of the coolant sensor and related wiring and it was finally discovered that a bad spot in the sensor orange wire inside the harness at the back of the motor where it takes a sharp bend. The harness was pulled apart and the faulty section wire was repaired. Updated 11/17/09.*jb the consumer wants to know the result of his complaint. Updated 01/21/10.