CEL P0351 Ignition Coil "A" Primary Control Circuit/Open
 

I'm getting this CEL while running hard on the track.
I've cleared it several times and it keeps coming back.
Anyone else seeing it?
Any known fixes?

You running a unichip?

I've gotten this CEL both with and without my tune.
The engine seems to be running fine otherwise.

Using a prior "older tune" I did get some misfires and the CEL in question.

remove the unichip and see if it goes away... interceptors can make sensitive monitors very unhappy. If you put it back to stock and still have the issue then you can at least rule out the unichip and start looking at replacing the coilpack etc.

Were you tracking with a unichip or ecutek tune?

I don't use or have a Unichip.

My car does have an EcuTek tune and the CEL first showed up while the tune was installed. I have since removed the tune, back to stock, and was able to reproduce the CEL but only on the track running hard.

Mine gets it also, completely stock ECU. At the dealership for a coil pack replacement right now actually. I'll see in a few weeks if it fixes it when I'm at the track again.

hmm are we uncovering a coil pack weakness or defect?

Did the dealer jump straight to the coils or did they check the plugs first? I'm wondering if we should be running a cooler plug on the track.

My Bad, sounded like you were saying you had one, but zeroed it out.

From a quick look at the manual it may be an overheating problem with no. 1 coil pack:

tuned in to this thread..this sorta thing, potential for warranty replacement can worry the FI consumer..my audi went thru a coil pack recall, but no aftermarket FI stuff there

what is the intelligent way to see if a colder plug works better(whatever that is to a coil pack)or provided 'benefits' short of my paying a tuner to run dyno and some exh gas analysis? is this cause we're boosting and tuning? I doubt its the plugs so early on, but ya never know, if its happening with OE tuning, then there maybe something there in the way of breakage potential we have uncovered, is it a call to carry a spare?

I'm curious to know what the dealership finds/replaces

Stumbled on this thread while searching...

Just picked up my car from the dealer after throwing a CEL. Dealer said the car was throwing an ignition related code. Coil pack on one bank replaced + dealer ECU reflash = problem solved so far.

Well technically they started the warranty claim off my picture of the code scanner, so they didn't see the car until this morning after the parts already arrived. I'm not sure what they are specifically checking first today.

OK so they replaced the Cyl 1 coil pack.. I'll see if it happens again.

It's interesting that the misfires I had were on cylinder 1 and all of the dealer coil replacements are on cylinder one as well.

What's special about cylinder one?

No idea why they seem to be cyl 1 specifically...

Dave you were running on the track when this CEL appeared correct?
Ultra were you also tracking your car?

I need to go to Dave's dealer. I made my second trip to the dealer today and got more questions about my ECU. They still haven't order the coil pack.

maybe poor airflow in comparison to the other 3 causes +1 to over heat. Which cylinder is #1?

BTW tracked the car in hotter weather both days this weekend, no CELs :thumbup:

Might have just been a bad coil afterall.

Cool, I'm hoping that's all it is.

I replaced my OEM coils Friday night with a set of Okada coils.
Hit the track Saturday and ran hard for 6 hours... No CEL.

I don't believe the OEM coils are well suited for track use.

specs on the Okada coils?

This is what I put in:

http://www.okadaprojects.com/usa/products_direct.htm

Looks like a cool product. I didn't see an application for the FRS/BRZ. Did you call them? How much for the set?

Okada's web page isn't up to date - They do make a set for the BRZ/FR-S.
Here's where I got them:

http://www.ft86club.com/forums/showt...ighlight=Okada

I figured the OEM coils are $110 each and have already displayed a life of about 7 months on the track, misfiring part of that time. On the other hand the Okada coils are about $200 each and seem to have a good reputation in stressful applications.

Sounds like a GREAT opportunity to approach the vendor with a GB order, if these work out for u I want a set for sure
who else?

whoah. one hell of a markup on that thread you linked. That takeda intake is normally around 350, not 400... I got mine for 150, just saying, might want to shop around a bit, gem.

The thread says PM for best price. Anyways that's not an outrageous price for what I've seen the Okadas go for. I've always they were snake oil but people have actually got good results out of them for the other Subaru models. The WRX/STi however never really have an issue ignition wise until you are at some enormous HP level.

tracking it and logging tomorrow, it gonna be hot so lets see what happens

I ran a set of the okada coils on my evo with meth. They honestly did not work any better than stock. IIRC they are just modified stock coils anyway.. At least they wee for the 46G3.

Got the CEL and same OBD code on track. Car has never had an aftermarket tune. Took it to the dealer. They said they will replace the coils and put an order. Waiting for them to arrive. Have another track day in a week, will see how it goes.

This code is going to be quite common for the track guys and for the people who drive it hard on the streets. I can see it now. My car has been at the dealer for 2 days now. But as soon as I got this code, the car would pop several times from the engine bay under moderate to WOT accerlation in low - mid RPM range and especially going 70 mph on the highway in 6th.

Andd just found out I had a injector leak causing the 1st cyl to malfunction which is why the PO351 popped up for me.

i just had this cel pop up for me this weekend on the track. i have LW pully and header back

Do you have a tune?
How many miles on the car?
How many track sessions?
What Fuel?
What Specific Code (which cylinder)?

I'm trying to understand if this is a heat related issue breaking down the coilpacks or bad injector seals causing lean condition (i think this could over heat the coil pack over time as well).

no tune on the car was running 93 octane fuel and it was a p0351.

10k miles on it and before i hit the track it was about 9500

i did maybe 3-4 30min sessions with 30-60mins min between the sessions on day 1 and about the same on day 2 and i made sure to do cool down lap. and i got the light on both days and cleared it but the car ran fine.

i even changed the the oil to 5w-30.

i am going to take it to the dealer ship and see what they say

Just got this CEL again... what scares me is that this is the same CEL I got right before I started having DI leaking and popping under acceleration.

When I got the code, I changed the coil and plug on number 1 cylinder and it fixed it.

Simmons

Just got the same code today. P0351. Turned on while I was flooring it in 4th on the on-ramp of the highway. I have an ecutek tune. If I flash it back to stock and take it back in to the dealer will they replace it under warranty?

Got this code again. Stock ecu. happened shifting into 4th gear. Only get it when I shift under WOT.

I just got this code today.. didn't hear a pop or anything. Whats everyone's advice? Flash to stock and hit the dealer up for new coils?