Q: 40 amp fuse blows when trying to start the vehicle.

asked by on

When I try to start my escalade the 40 amp IGN A fuse blows. I think it is the ignition switch. It is NOT the starter, as I have removed the starter and had it bench tested at o reilly and they said it tested good. What else could it be??

My car has 187000 miles.
My car has an automatic transmission.

You have a short in this circuit or a fault that is drawing excessive current. It could be the coil packs, ignition module, or a wiring fault (a short perhaps). This will require some effort with a volt meter to determine where the fault is occurring. If you would like some diagnostic assistance, I would recommend having a mobile, professional mechanic, such as one from YourMechanic, perform an inspection for any electrical problems.

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. 40 amp fuse blows when trying to start the vehicle.

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 coolant reservoir (plastic part) is always empty after 3-5 days but my radiatior is always full and then my car starts to over

Claimed by Jeff Engstrom

Q: Key stuck in ignition; removed fuse to turn car off

You should have the ignition switch and the passenger seat module replaced in order to keep your vehicle operating safely. The problem with the seat module seems to be very common across for the 2009 Saturn Sky, I would look...

Q: How do i know if my voltage regulator is bad

This may be related to ether the alternator or the voltage regulator. I would suggest having the alternator checked to determine if it is receiving the proper amount of voltage from something called the voltage regulator. The voltage regulator regulates...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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.