Drivetrain Malfunction P0303 code

[JTM09]

Posting this experience to help others in the future as more F80s are runing out of warranty.


Car: '17 M3 6 speed
37k miles

This is the first issue the car has ever given me.

Here is what happened:

It is a beautiful sunny day in Mexico, so I punch it on a long on ramp. I hit about 80-85mph and the idrive display shows the 'drivetrain malfunction' error with a CEL on the dash. Car seems ok but power is definitely diminished.

I pull over at the next safe spot and I can hear the engine misfiring.

Turn the car off, wait a moment, turn back on and all seems fine. No misfire, no CEL.

As I accelerate again the error pops up and I lose a bit of power once again. I drive home, no noticeable noises or misfires noted.

When I pull the code with my generic reader there are 2 codes, both P0303

Next AM I drop the car at the dealer.

Dealer says there must have been a misfire issue in cylinder 3. Replaces plug and coil. Clears CEL.

So far all seems ok. Will report back. Hopefully the fix was that easy!

[AlejoEvo]

I looked for the code and the solution is an injector replacement. The dealer must solve this in no time!

I hope you don't have anymore issues in the future.