Q: Car won't start. Electronics work, but loud screeching noise comes from fuse/battery boxes in the trunk when turn ignition key.

asked by on

My magnum has been having a multitude of starting/engine stopping problems. First the engine died whenever I gave it gas, which made it impossible to drive. I took it to the dealer where they looked at it for a month, and found nothing. They checked fuel, air, replaced all valves. They changed the spark plugs and then the problem was ironically reversed--it would drive, but it dies once it goes below 500 RPM, can't idle, have to keep foot on gas in neutral at stoplight. NOW suddenly the car won't even start. When I turn the ignition key the electronics go haywire and there is a loud distorted screeching noise coming from around the battery and fuse box in the back of the car. I tried jumping it and the electronics work now, but it won't crank, noise remains. I don't know if any of these problems are even related. Dealership is at a loss. No one can help me and I've spent a thousand dollars just in diagnostics.

My car has 75000 miles.
My car has an automatic transmission.

Hi and thanks for contacting You Mechanic. There could be a lot of issues that could relate to this topic, however, I have narrowed it down to 4 things to check.

First check the battery and make sure that the cables are tight. Perform a load test on the battery and make sure that the battery is functioning correctly. Most dealerships will not check a battery correctly and they should on every vehicle.

Second, check for any loose cables to the starter and see if the wires have any corrosion. If there is corrosion then the wire needs replaced (if the wire is green).

Third, check the MAF (Mass Airflow) sensor for if it is dirty or damaged. If you see that it is dirty or damaged, then it needs replaced.

Last, if everything works then the computer has a burned a ground circuit within the computer housing. Check the computer harness for any burned pins and if all of the pin are good then the computer needs replaced.

If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from YourMechanic, that can assist you with diagnosing the engine starting issue.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car won't start. Electronics work, but loud screeching noise comes from fuse/battery boxes in the trunk when turn ignition key.

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

Get a quote

What others are asking

Q: My 2006 buick lacrosse wont go past 60 mph when pressing on gas pedal

Hi Leslie. Thanks for contacting us today. In most cases, an acceleration problem like you've described is caused by either a fluid restriction in the transmission or excessive heat in the transmission. It can also be due to fuel/air mixture...

Q: Aux input is not working in the radio

You will need to visit a Volkswagen workshop to have the service performed. Their equipment will be able to determine whether the fault has to do with coding, or a malfunction in the radio itself. They will be best equipped...

Q: Car has burned plastic smell.

If you see smoke get out and dial 911 a car fire can start very quickly and without warning in some cases. If there is no visible smoke and its just a nuisance smell, I would suspect something in the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.