2003 Grand Marquis was perfect BUT sat for a year - now mechanic says needs POWER TRAIN Control module

Asked by Feb 26, 2015 at 09:47 AM about the 2003 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

2003 Mercury Marquis with 20k miles was pristine but then sat outside for a year - now wont start and FORD says it need a $985.00 power train control module.....Step one: Just to see if there are other issues.....Sound about right?

10 Answers

1,405

This is probably from the battery going completely dead and now the car has no communication with the module; they're right so far as there being no way to determine other issues if the obd2 system won't communicate. Maybe a used one is available for the car.

Thanks Chris for replying. Wouldn't Ford dealership be able to hook something up to communicate/diagnose? ford says used is 698 no warranty.

47,535

Did you take this vehicle to a Ford dealer or an independent mechanic?

It is currently at Ford dealership waiting on go ahead to order module

Suggestions?

47,535

Certainly it is possible that the ECU is bad, but I personally would be very surprised that it is bad. The Ford dealer is the best place to have this work done and the list price for the ECU is just over $700.00 with your old unit as an exchange. Tasca parts online (a large Ford Dealer) shows the ECU part number as 3W7Z-12A650-BEB and they show it to be discontinued. Perhaps your Ford dealer has located a remaining part sitting on a shelf at another dealer.

1 of 1 people found this helpful.
1,405

Joe, sometimes a bad module prevents codes from being extracted. That's why the dealer has said that it needs the module first, before seeing if there are other issues, unfortunately.

360

Wow that does sound kind of weird with only 20k on it doesn't seem to me like the module would just go bad I'm not real familiar with Fords computer system but I guess it is possible for it to lose its memory but it seems to me like the Ford dealership should be able to reflash the computer (they may be just trying to sell you a computer module) I would get a second opinion different dealership and check with independent garages and see if they heard of anything like your experiencing

1 of 1 people found this helpful.
1,245

I smell a rat. my 2002 sat for years with a dead battery, and it fired right up, took a while for the codes to re-set.

1 of 1 people found this helpful.
47,535

If the ECU is bad it is just a coincidence, letting a vehicle sit for 1 year will not ruin the ECU even if the battery does run down. I wonder if a mouse or mice ate some of the wiring. I would take a really close look for mouse damage.

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,835 nationwide Grand Marquis listings starting at $2,000.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,520
#2 kbro
kbro
Reputation 2,080
#3 Js08016
Js08016
Reputation 1,790
View All

Related Models For Sale

Used Ford Crown Victoria
16 Great Deals out of 1,221 listings starting at $1,595
Used Lincoln Town Car
34 Great Deals out of 1,791 listings starting at $1,500
Used Chevrolet Impala
589 Great Deals out of 34,066 listings starting at $899
Used Ford F-150
2,068 Great Deals out of 207,301 listings starting at $1,499
Used Mercury Marauder
22 listings starting at $9,300
Used Honda Accord
941 Great Deals out of 77,703 listings starting at $899
Used Ford Taurus
270 Great Deals out of 20,569 listings starting at $1,995
Used Cadillac DeVille
4 Great Deals out of 1,626 listings starting at $1,988
Used Buick LeSabre
20 Great Deals out of 1,919 listings starting at $1,000
Used Ford Mustang
543 Great Deals out of 45,840 listings starting at $1,999
Used Chevrolet Tahoe
556 Great Deals out of 31,361 listings starting at $1,500

Used Cars For Sale

2007 Mercury Grand Marquis LS Premium For Sale
7 Great Deals out of 93 listings starting at $2,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.