[aspiller98]

I have taken my car to three different dealers a total of four times. None of them can figure out why this happens. All test come back good, codes P0301 P0302 P0303 P0304 sometimes but others it will code nothing. Had fuel injectors and head gasket replaced under warranty as a “see if this does anything” fix. I’m trading this car in, just waiting on my new one to arrive at dealer. Good compression, electrical test and mechanical inspection. Everything is “up to spec”. The engine will only misfire and go into limp mode when engine is cool. A 5 second restart of the car fixes the issue and is back to normal.


2020 Accord LX
1.5L T CVT
21000 miles
Regular maintenance completed

video: New video by Austin Spiller

 

[taz69]

ECU issue maybe needs replaced.

 

[Fired00d]

Like @taz69 said may be an ECM issue... take a look at this thread - 2018 Honda Accord Sport "limp mode?". Your issues are similar.

 

[Vegashybrid]

Don't understand if you having misfires why they didn't change out coilpack and spark plugs as well as the maf too.

 

[Twas A Still Night]

Don't understand if you having misfires why they didn't change out coilpack and spark plugs as well as the maf too.

I agree with VegasHybrid. Typically, the first "go-to" repair on misfires is fresh plugs and coil packs.

 

[aspiller98]

I agree with VegasHybrid. Typically, the first "go-to" repair on misfires is fresh plugs and coil packs.

No idea, maybe they tested them and thought they were fine

 

[Vegashybrid]

No idea, maybe they tested them and thought they were fine

Not likely. Nowadays if something isn't throwing a code they won't touch it or don't know what to do with it.

 

[aspiller98]

Not likely. Nowadays if something isn't throwing a code they won't touch it or don't know what to do with it.

My codes were P0300, P0301, P0302, P0303, P0304.

 

[Vegashybrid]

My codes were P0300, P0301, P0302, P0303, P0304.

Again, it's not throwing a code specifically for it they don't know what to do. Those are simply misfire codes for each cylinder, 300 is a code for misfire on multiple cylinder. None of them are specific. So knowing this, refer to my first post..... Why haven't they changed the coils and plugs?

 

[aspiller98]

Again, it's not throwing a code specifically for it they don't know what to do. Those are simply misfire codes for each cylinder, 300 is a code for misfire on multiple cylinder. None of them are specific. So knowing this, refer to my first post..... Why haven't they changed the coils and plugs?

I wish I knew. I even took had it diagnosed, with no firm diagnosis, at two honda dealerships.

 

[Vegashybrid]

You need to take the car in and have them keep it demand they change the coils and plugs. Also demand a courtesy vehicle. They need to keep the vehicle until they resolve the issue. If they can't then it's time to get a manager involved and either take your vehicle back and trade you a different one or buy the car back as if it were fine, and you go on your merry way. Or get Honda NA involved. But again, coils and plugs should have been first,.but because there are no codes..... again I'm leaning toward the ecm being faulty. I believe there seems to be a pattern emerging with the 2018's but will see.