2012 Ignition coil issue

Hey y'all,
Might have been asked before, but what causes the ignition coil to go bad? I threw a P0352 code one day, changed plugs and coils, it threw the code a week later, changed spark plugs, moved coils around, and now it's throwing the same AGAIN... What could be causing this?
Thanks in advance for any help!!

 

So you changed the coils with new coils, then the new coil on cyl #2 threw the same code.
And then you swapped the coil, and the same code returned?

If so, I’d be looking at the wiring for the IGF circuit on cyl #2.

 

Here is a how to on diag for that code

https://www.tacomaworld.com/threads/2nd-gen-information-diagnostics.784008/#post-28042157

 

That is correct . I changed coils around again today, put dielectric grease on everything. Still throwing code... Would you happen to have a diagram for the IGF circuit. Please and thanks for response

 

Have you ever changed the valve cover and spark plug tube gaskets?

 

Lots of good info here.
This is one of the threads that lead Dm93 to do a “How to” diag.
https://www.tacomaworld.com/threads/2005-4-0l-no-spark.745353/#post-26537764

 

I won’t be able to get you a 2012 diagram until later today.
I’m not sure 2012 is any different than the rest.
The link above to the Diagnosis “How to” by @Dm93 will have all you need.

 

Is this a 2.7 or 4.0 truck?

The link above is for a 4.0.
If it’s a 2.7 give me a little bit, I will see what I can find.

 

2.7 sir

 

No sir I have not... I will look into that tho!
Ty

 

This should help “some”.

 

Pop the number 4 coil off (because it’s the easiest to get to) and look down the tube; there should be little to zero engine oil down there. If it’s wet, the tube seals are toast and allowing engine oil to short out the ignition. You’ve got this. Good luck!

 

P0352 is for coil #2
I’d assume he would have noticed oil when swapping the coils twice now?

 

Srry I've been busy all day, anyway here's the diagrams.

OP does the code set instantly or is it random?
@TnShooter has you on the right track, if it's random I'd suspect a wiring problem. Have you done a visual inspection of the wiring?

 

A week later after going through everything, wiring and coils n such...it rears its ugly head again, and gives me 2 new codes for oxygen sensor and secondary air pump..guess I'll get those changed out and pray it helps... if not, then it may be time to trade it off...ugh

 

What codes are you getting now?

 

P0353. Cylinder 3 now. Changed all the parts from last codes, checked wiring, added dielectric grease to all the coils and spark plug boots. Started on 4 went to 2 now to 3....ugh

 

You said in your previous post, O2 sensor and secondary pump?

 

What kind of replacement coils are you using, hopefully not Amazon/ebay specials.
Sounds like you either have some wires intermittently going open or shorting or your getting defective parts.

 

Denso...Autozone