Amber Coil or loop symbol (looks like a spring) Light: Glow Plug Light Warning Light
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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.
🔗 Related Warning Lights
Check Soon (Solid) / Stop Immediately (Flashing)
Check Engine Light
Amber — Engine block outline with CHECK text
Check Soon
Tire Pressure Light
Amber — Horseshoe with exclamation point in center (tire cross-section)
Check Soon
Abs Warning Light
Amber — Circle with ABS text and parentheses
❓ Frequently Asked Questions
Can I keep driving with this light on?
✅ Yes, with caution. You can continue driving but should have the issue diagnosed at your next convenience. Schedule a service appointment within the next few days.
What does the Glow Plug Light mean?
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.
How much does it cost to fix?
Repair costs vary widely depending on the root cause. Typical range is $100–$1,500. A diagnostic scan (free with a $20 OBD2 reader or $100–$200 at a shop) is recommended before replacing any parts.