Amber Coil or loop symbol (looks like a spring) Light: Glow Plug Light Warning Light
⚠️
Flashing: Check Soon | Solid during start: Normal
The diesel glow plugs are warming up. If flashing while driving: a glow plug has failed or the glow plug control module has an error.
📋 What This Light Means
| Light Color | Amber |
| Symbol | Coil or loop symbol (looks like a spring) |
| Meaning | The diesel glow plugs are warming up. If flashing while driving: a glow plug has failed or the glow plug control module has an error. |
| Urgency | Flashing: Check Soon | Solid during start: Normal |
| Brand Specific | Diesel |
🛑 What to Do When This Light Comes On
Step 1: Solid light during starting is normal — wait for it to go out before cranking. If flashing while driving: one or more glow plugs have failed. The engine will still run but may be harder to start in cold weather.
⚠️ What happens if you ignore this light: A failed glow plug in cold weather can prevent the engine from starting. In warm weather you may not notice any symptoms. Multiple failed glow plugs will cause hard starting and increased emissions.
🛠️ Technician's Notes: Diesel-specific light. Not all diesel vehicles have a dedicated glow plug light — some use the Check Engine light instead.
📚 Data Sources: Warning light information compiled from SAE J2402 dashboard symbol standards, NHTSA vehicle safety regulations, OEM owner's manuals, and ASE master technician field experience. Different vehicle makes may display slightly different symbols. Always consult your owner's manual for make-specific warnings.