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2013 Cadillac ATS 2.0L Misfire
Posted to GM Driveability on 12/1/2025 7 Replies

The vehicle originally came in with a po303 code. we replaced the spark plugs in all cylinders and the #3 coil. after repair it idles perfectly, and on a short test drive drove perfect. A second test drive started the same. Perfect idle and smooth accelera...

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car Vehicle Data

2013 Cadillac ATS

VIN 1G6AG5RX3D
Engine2.0 L / 4 cyl / GAS
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursHot, Under Load

Trouble Codes

P0303Cylinder 3 Misfire Detected
P0304Cylinder 4 Misfire Detected
Open Help Request

car Vehicle Data

2013 Cadillac ATS

VIN 1G6AG5RX3D
Engine2.0 L / 4 cyl / GAS
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursHot, Under Load

Trouble Codes

P0303Cylinder 3 Misfire Detected
P0304Cylinder 4 Misfire Detected