Q: What will happen when a Ford ecm diode goes bad?

asked by on

What would cause an ecm diode on 2011 Ford mustang 5.0 to go bad and what are the symptoms?

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

The PCM power diode is put into the fuel pump and PCM relay power circuit to prevent power surge feedback into the circuit called flyback voltage then can be higher than normal operating voltage. The computer may get flyback voltage surge and may damage power circuits inside the PCM is the diode was not used or is shorted across letting voltage to flow both ways.

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. What will happen when a Ford ecm diode goes bad?

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: Can you raise the top speed control?

Hi there. There are two ways to speed up the vehicle. The first is to replace the output shaft speed sensor in the transmission to sense a slower speed, thus confusing the computer to make the car drive faster. The...

Q: brake rubbing noise

The problem is that you had the brake rotors resurfaced and the pads were not replaced. The old pads surface was not flat when the rotor surface was resurfaced. The raised parts of the pads wore into the rotors first...

Q: I got 150000 on my 2011 sho when should I change my timing chain?

Hi Robert. Thanks for writing in today. Although it's vital to change belts and hoses on a regular interval (as they are designed to wear), there is no recommended replacement for a timing chain. In theory, the timing chain should...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...