Yanmar Marine Preheat / Glow System Fault
The YANMAR-MARINE-GLOW (Yanmar) diesel fault code means: Yanmar Marine Preheat / Glow System Fault. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- beginner
- Estimated cost
- $60-$300
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Common Symptoms
- Hard cold start on 3YM / 4JH
- White smoke at startup
Probable Causes (Ranked by Likelihood)
- Failed glow plug relay at helm panel Likely
- Glow plug open circuit Likely
Step-by-Step Diagnostic Procedure
Check preheat relay operation at helm.
Ohm-test glow plugs at engine.
Frequently Asked Questions
What is Yanmar code MARINE-GLOW?
Yanmar MARINE-GLOW: Yanmar Marine Preheat / Glow System Fault. This code is reported on Yanmar equipment running the described engine family.
Can I keep working with Yanmar code MARINE-GLOW?
Usually drivable short-term, but fix soon to avoid derate or DPF issues.
How much does Yanmar MARINE-GLOW cost to fix?
Typical repair cost: $60-$300. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Yanmar SmartAssist / YDT) is usually required.