☰
GET A QUOTE

Q: Car blows ecm run/start fuse after starting and then dies replaced fuse and repeats

asked by on June 23, 2017

So what happened is I was checking spark plugs and I accidentally touched the wrench to the positive battery terminal causing it to weld the wrench an art to it blew my 100 200 amp fuse on the battery post replaced it car ran fine and drove fine for three days then as I was driving at home it died towed it to fiance's parents house inspected all fuses to find fuse number 45 ECM Run start fuse was blown it is a 5 amp fuse replaced the fuse with another 5 amp fuse started the car and the fuse blew again after a few seconds and the car turned off again no visible damage wires upon visual inspection by myself

My car has 120000 miles.
My car has a manual transmission.

Recommended Services

Electric Problems Inspection $94.99 - $114.99 Get a Quote
Or For Any Other Auto Repairs Get a Quote

Hi there. Typically when this issue occurs, damage will be instant - meaning if it’s going to damage the ECU, replacing the fuses would not help start the vehicle. So, at first glance, I would assume the ECU is OK. What is more likely is that you have an exposed wire somewhere that is causing the fuses to pop. Trying to diagnose these issues can be tricky sometimes, so it might be a good idea to have a professional mechanic complete an electrical problems inspection to isolate why you’re having these issues and recommend the right repairs.

Ford
Mustang
2011
V8-5.0L
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car not starting, only clicks.
The first thing I would have checked by a certified mechanic would be the battery (https://www.yourmechanic.com/services/battery-is-dead-inspection), a typical battery for your car only has a useful life of about 3-5 years. The amount of power left in the battery might...
Read more
Engine overheating and won't start
There are many potential causes for engine overheating (https://www.yourmechanic.com/article/what-causes-a-car-to-overheat), a failed water pump being one of them. Allowing your engine to overheat even once can result in catastrophic engine damage. It sounds like this is what may have happened to...
Read more
Parking light & headlight positions don't work
There is a 15A fuse for the front parking light function in the fuse box under the dash. The turn signals are on a separate circuit so this is why they might still be operational when the parking lights are...
Read more
Car turns off out of nowhere
Hello, I would suggest testing your alternator. If jump starting will start your vehicle, use a multi meter to test your alternator while the vehicle is running. Good alternators test in the range of 13.8 to 14.2 volts. If it...
Read more
Multiple problems on a 1996 Jeep Grand Cherokee
Hi there. From the description you have provided, there are multiple problems going on with your vehicle, so the faults may or may not be related. Although the car is showing many symptoms, this may not be terminal. It could...
Read more
Car wont start - 2001 Nissan Sentra
Hello there, a variety of faults will cause your 2001 Nissan Sentra to overheat, be low on coolant, and now have starting trouble. The first problem is the vehicle being low on coolant (https://www.yourmechanic.com/services/top-off-coolant), either there is a leak in...
Read more
I took my car in for a full service today. They did the service and my car suddenly cannot be driven. What could the issue be?
Hi there. If the code came on for the camshaft position sensor, then the computer has seen that the sensor is not working properly. If the vehicle was working before and now has the code for the camshaft position sensor,...
Read more
My Toyota Will not move in reverse when the engine is hot
If your car will reverse in when cold but not when hot, it's likely that you're looking at a mechanical failure in the transmission. automatic transmissions use hydraulic pressure to operate the various clutches and bands that shift the gears....
Read more
2012 Jeep Grand Cherokee replaces altanator, still won’t start. Brake seems locked
The brakes may feel stiff prior to starting the vehicle as the vacuum that exists in the brake booster when the vehicle is running may decrease when the vehicle is not running. Once the vehicle starts, the booster replenishes the...
Read more

Related articles

2012 Ford F-150 vs. 2012 Chevrolet Silverado: Which One Should I Buy?
When you’re ready to really get some work done, there’s nothing like a full size pickup truck. These trucks are ready to haul a big load and really get in there and get busy. SUVs are great for moving people,...
Read more
The Best Used Cars to Buy If You Have Kids
Once Once you have kids, the kind of car you have becomes very important. Suddenly, the amount of space, entertainment features, reliability, safety, and easy to clean interior become the top priorities. Here’s a list of vehicles meant to satisfy...
Read more
The Top 5 Selling Cars in Arkansas in 2012
Arkansas, Arkansas, like many other states, has to deal with a wide range of weather, from the stifling to the icy. This means drivers need vehicles that can handle the heat while also helping them get through slippery conditions. In...
Read more

Browse other content

Cars
Estimates
Cities
Maintenance