Q: Can bad coils fry that computer the PCM

asked by on

Mechanic said that the PCM in the car was fried and that it was caused by bad coils that there was a short in the coils and also a bad injector they replace the computer and one of the coils I drove it 3 miles and they said that they computer fried again and had to replace it again

My car has 121000 miles.
My car has an automatic transmission.

OBD-II PCMs have circuit protection to take account of the possibility of shorted actuators (fuel injectors, coil drivers) and other electrical overloads. Statistically, the PCM is probably the most reliable component on the entire vehicle. If the cause of the original fault (no start?) was claimed to be due to "coils", then how could the PCM have possibly failed again if a new coil was installed and the other coils were verified? That is, if the PCM was truly damaged, the cause obviously has nothing to do with the coils inasmuch as the failure occurred twice (after the coil issued was repaired). If you are back to square one and need a conclusive diagnostic, please request an electrical diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. Can bad coils fry that computer the PCM

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: High idling on cold start

Hi there thanks for writing in about your 2006 Lincoln Zephyr. This sounds like a failing idle air control valve issue. If this is confirmed, and the valve is replaced, there is also a 'relearning" process for the engine management...

Q: Need to reset or bypass the anti-theft system. Everything works just won't start.

Hi there. Try removing the battery cable for 13 minutes and operating everything in the car with the battery disconnected. Then when the battery is connected, reprogram the key fob remote to the vehicle and unlock and lock the drive...

Q: car will turn over but will not start i cannot tell if it's getting fuel or not. how do i know if it is getting fuel

You will have a fuel test port on the fuel rail that you can hook up a fuel pressure gauge to. Depending on the motor your pressure would need to be around 40psi. You can listen to the fuel pump...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...