P0300: Ratés d'allumage aléatoires ou multiples détectés
Ratés d'allumage aléatoires ou multiples détectés : Crankshaft position sensor angular velocity fluctuations indicate combustion misfires across two or more cylinders.
| Trouble Code (DTC) | P0300 |
|---|---|
| Official SAE Definition | Ratés d'allumage aléatoires ou multiples détectés |
| Vehicle Subsystem | powertrain |
| Driving Severity | HIGH |
Observable Symptoms
- Flashing or steady Check Engine Light
- Engine vibration and loss of power
- Risk of rapid catalytic converter overheating
Most Probable Root Causes
- Worn spark plugs or failing ignition coils
- Vacuum leak or EGR valve stuck open
- Low fuel pressure or contaminated fuel
- Timing chain/belt stretch or low compression
Step-by-Step Diagnostic Procedure
- Do not drive under heavy load if MIL is flashing
- Check Mode $06 misfire counters per cylinder
- Inspect spark plugs, coil boots, fuel pressure, and intake vacuum integrity