P0351 is a generic OBD II trouble code, which method that it method the same thing because that the Ford combination as the would any other vehicle. It suggests that ignition coil “A” is malfunctioning. The is typically caused through a negative coil pack or wiring harness issue, return there have the right to be other causes as well.

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The primary wiring is the wiring harness top from your Fusion’s ECM/PCM to the ignition mechanism itself.A short, open, or poorly soil wiring harness is practically always what causes P0351 when it is the major wiring next that has actually thrown the code.

The secondary side of the equation is the spark side. Which means that plugs, plug wires (if so equipped) or the spark plug chin is causing your blend to litter P0351. Ignition Coil “A” suggests the problem is in cylinder 1. You’ll should look increase which cylinder is number one on your engine. Different manufacturers use different methods. Here’s a pretty good explanation of just how how to find cylinder 1.

There is a really straightforward test to identify if it is the primary or secondary wiring that has actually thrown this code in your Fusion. You relocate the ignition contents (coil pack, plug wire, plug) indigenous one cylinder to another, and clear the codes. If the code “moves” you know that it’s a secondary issue. If the stays, it’s a primary. We get in this in greater detail below.


P0351 Symptoms: Ford Fusion

Check Engine Light– The check engine light may be all the you an alert when you have actually this code, specifically if the is resulted in by an intermittent wiring concern with your Fusion. Rough Idle– You vehicle may idle turbulent if cylinder 1 isn’t getting enough spark. You very well might smell raw fuel together your Fusion’s engine runs together well.

P0351 Causes: Ford Fusion

Wiring worries (short, open, or poor ground) negative Coil Pack loose Connection in ~ the coil poor PCM


Voltage test (Optional, however time saving)

The an initial place the you would want to start trying to find what can be leading to P0351 in your vehicle would be the wiring harness. You have the right to use a digital voltmeter to inspect if the coil fill is acquiring the proper signal. Friend would want to set it for A/C hertz and check to check out if that is between 5-20hz.

If that was in between 5-20hz, it’s very likely that the coil pack has actually gone bad. Although, it could additionally be a negative plug or plug wire as well. If it has no signal, it’s time to look at the wiring harness. If friend don’t have actually a voltmeter, you have the right to use the components swap technique to help you identify if it’s the primary or an additional side bring about your problems. Watch directly listed below ↓.

Parts Swap

A good way to recognize if that is an ignition associated component, and not a wiring issue, is come reset the trouble code and swap the coil, plug, and also plug wire (if equipped) with another cylinder. If the misfire jumps come the cylinder that you’ve simply swapped your Fusion’s ignition contents into, climate you recognize that you are looking at is a coil, plug wire, or (most likely) coil pack failure.

If the misfire did relocate cylinders, you have the right to go ahead and replace the plug, plug wire, and also coil pack. If you space on a chop budget, you deserve to keep resetting the code and swap the ignition parts back one at a time until the misfire returns to cylinder one. Begin with the coil pack.


If the misfire failure to relocate from cylinder one, then you understand that you many likely have an worry with the wiring harness going indigenous the coil pack to the Fusion’s PCM. Take a watch at where the harness plugs into the coil pack. Is that damaged or loosened feeling in relationship to the various other cylinder’s connections? If so it might need to it is in replaced.

If the misfire is intermittent, go ahead and also jiggle the wiring harness and also see if it has actually an affect on the means the engine is running. If that does start or avoid misfiring, you understand you’ve found your problem. Look everywhere that the exploit bends or touches anything sharp. Look at to watch if that looks charred anywhere. Examine for damage and also repair the wiring accordingly.

Make certain that it has a solid ground.

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If girlfriend still can’t uncover the problem, it’s time to take it a look in ~ the PCM. This is the the very least likely answer, and also an area wherein it may be time to contact in the pro’s.

Conclusion: P0351 Ford Fusion

P0351 is generally pretty straightforward to diagnose v the swap test, also if friend don’t have any kind of specialty diagnostic tools. If there is noþeles you can add, please leaving a comment below. Good luck solving your Fusion!