Hey guys I recently ran into an issue with my car that I haven’t been able to figure out I went to start it one morning and it started misfiring.
codes P0300 Random / Multiple Cylinder Misfire Detected

P0301 Cylinder 1 Misfire Detected

P0303 Cylinder 3 Misfire Detected

P0305 Cylinder 5 Misfire Detected

P0307 Cylinder 7 Misfire Detected

P1200 Fuel Pump Relay / ECU circuit fault

any thoughts or ideas would be helpful thank you in advance

 

Hello,

What Year and Mileage on your car?

From the Codes I will assume that it's a 2nd-gen Facelift. Misfire Codes are localized to Bank 1, makes me think of a VVT-i system malfunction, not much else links All the Cylinders on one Bank, here is a thread of what it looks like, the only concern that yours didn't trip any VVT-i related codes. If the Solenoids are easy to access, see if you can power them directly from the Battery, like it's shown in the thread, see if you can hear a distinct Click, then start the Engine and power the Solenoid again, see if anything will change.

If that won't help, more information will be needed, like the Year of the car and the current Mileage, were there any Repairs done to the car prior to the issue, if you have a Scan Tool capable of reading Engine Live Data, etc.

As for P1200, I would come back to it only after solving the Misfire Codes, as a failed Fuel Pump or its ECU would prevent the Engine from starting at all, or would cause only the P0300 - Random Misfire Code, the Misfire wouldn't be localized specifically to one Bank. There is a good chance it's just a residual Code from a drop in Voltage or something similar, and it would clear after a Reset.

Hope this helps and best of luck!