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.
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