Dashboard Warning Lights: Complete Guide
Three colors: Red (stop immediately), Yellow (fix soon), Blue/Green (informational).
Red Lights — Stop Immediately
| Light | Meaning | Action |
|---|---|---|
| Oil Pressure | Engine oil pressure critically low | STOP NOW. Shut off engine. Continuing can destroy your engine in minutes. |
| Coolant Temp (Overheating) | Engine overheating | STOP NOW. Pull over, turn off engine. Wait 30+ min before checking coolant. |
| Battery / Charging | Alternator failed — running on battery | Drive directly to shop. Turn off all electronics. 15-60 min before stall. |
| Brake System | Low fluid, parking brake on, or ABS fault | Check immediately. Do NOT drive if pedal feels soft or sinks. |
Yellow Lights — Fix Soon
| Light | Meaning | Action |
|---|---|---|
| Check Engine (solid) | Emissions or engine fault detected | OK to drive. Diagnose soon. See OBD2 code lookup. |
| Check Engine (flashing) | Severe misfire — catalyst damage risk | Drive gently to nearest shop. Do NOT drive on highway. |
| ABS | Anti-lock brakes disabled | Regular brakes work. Safe to drive but get checked. |
| TPMS (Tire Pressure) | Low tire pressure | Check and inflate to door sticker pressure. Light resets after driving. |
| Traction/Stability Control | System disabled or active (flashing) | Safe to drive but stability assist unavailable. |
| Airbag/SRS | Airbag system fault | Safe to drive. Airbags may not deploy in crash — get checked. |
| Low Fuel | 1-2 gallons remaining (30-50 miles) | Fill up soon. Running on empty damages fuel pump. |
Blue/Green — Informational
| Light | Meaning |
|---|---|
| High Beams | High beams active. Turn off for oncoming traffic. |
| Cruise Control | Cruise control maintaining set speed. |
| ECO Mode | Fuel-saving mode active. Reduced throttle response is normal. |
Not Sure What a Light Means?
- Check the color. Red = immediate action. Yellow = check soon. Blue/Green = normal.
- Never ignore flashing lights. A flashing check engine light is a severe misfire — stop driving hard.
- Use an OBD2 scanner. A $20 scanner tells you the exact code. See our OBD2 Scanner Guide.
These descriptions apply to most vehicles 2000+. When in doubt, consult your owner’s manual.