Causes and Fixes P0351 Code: Ignition Coil "A" Primary / Secondary Circuit

How to fix a P0351 engine code: Ignition Coil A Primary / Secondary Circuit
A P0351 Code is set when the computer (ECM/PCM) detects an issue with the primary or secondary circuit for ignition coil “A.”
Ignition Coil “A.” is the number 1 cylinder.
Possible Causes of a P0351 Code:
Bad ignition coil
Ignition coil wiring
Bad Spark Plug
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[@adamgenereux4514]

Finally a video that fully explains reasons why im getting the code and ways to troubleshoot. Thanks 🙏

[@joshuahamrick4027]

This was very helpful and very instructional. Thanks 👍

[@kirbyschneider4187]

Thank you for listing all the possible reasons, too. Thank you for the video!

[@crakalakin81]

Straight to the point!!

[@brenteastman1899]

Checked wiring and parts all test good. Still have the code wondering if the vvt could be the cause. I replaced the drivers side but not the passenger side vvt valve. I was having similar issues on drivers side with the bad vvt. So I'm wondering

[@Jasonpmc78-wm3xu]

I only have one coil on my truck, no coil packs. I have code p0351 ignition coil open primary. So should I still start at the plug wire ?

[@jaybrintnell7624]

I've been getting misfires under when under load (accelerating, gearing up, etc). I am am getting these codes on Coils A and C even after replacing the coils and plugs, and the car won't start. The car is 340K km, could this be related to VVT and timing? Could it be a failed phaser and cam position related?

[@chrisaalexander]

What about when I get both this, and a P0301?

[@HVAC_Mechanic]

I would check the coil on cylinder #1 and the wiring going to the coil

[@Delgadoe895]

I’m getting a misfire on cylinder 1 as well as code for primary/secondary circuit for A and D, cylinder 1 coil was fried so I replaced all coils and spark plugs but still fried cylinder 1 coil, any idea what’s happening?

[@HVAC_Mechanic]

There must be a wiring issue

[@chrisaalexander]

Wiring? What about the injectors?