P0303 on Hyundai Vehicles: Cylinder 3 Misfire Detected
Cylinder 3 is misfiring. Check whether it misses at idle or under load before you blame the coil. P0303 →
15Complaints mentioning the code
#5Rank among 15 brands
2.1%Share of Hyundai DTC complaints
In NHTSA owner complaints we analyzed for Hyundai, P0303 was mentioned 15 times.
Most mentioned models
| Hyundai Sonata | 4 | |
|---|---|---|
| Hyundai Elantra Gt | 3 | |
| Hyundai Tucson | 3 | |
| Hyundai Elantra | 2 | |
| Hyundai Genesis | 1 | |
| Hyundai Sonata Hybrid | 1 |
Model years mentioned
Components named in these complaints
- Engine (14)
- Power Train (3)
- Electrical System (2)
- Unknown Or Other (1)
- Service Brakes (1)
Reports with a crash: 1 · fire: 0 · injuries: 1
Often appears together with
P0300
Powertrain
The engine computer sees misfires that jump between cylinders or hit several cylinders at once.
High
P0301
Powertrain
Cylinder 1 is repeatedly failing to fire. The cause is almost always its coil, plug, injector…
Moderate
P0302
Powertrain
Cylinder 2 keeps misfiring. On inline engines it's a middle cylinder, so rule out coolant…
Moderate
P0304
Powertrain
Cylinder 4 is misfiring. Its end or rear position makes water, oil and intake leaks common…
Moderate
P0014
Powertrain
The bank 1 exhaust cam won't follow its target and stays too far advanced; think oil, valve…
Moderate
P0326
Powertrain
Knock sensor 1 works electrically, but what it hears doesn't match what the computer expects.
Low
Possible causes
- Failing ignition coil or boot on cylinder 3 (or the shared 2/3 coil on wasted-spark engines)
- Worn or damaged cylinder 3 spark plug
- Clogged, sticking or leaking cylinder 3 fuel injector
- Valve problem on cylinder 3: tight exhaust valve clearance, burned valve or worn cam lobe
Related codes
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.