Glow Plug Light (Diesel) on a Honda Legend
This is usually informational. Address it at your convenience.
What the Glow Plug Light (Diesel) Means on a Honda Legend
On a diesel Honda Legend, the coiled glow-plug light is normal at start-up: it shows the glow plugs are pre-heating the cylinders. You wait for it to go out before cranking. If it flashes after warm-up, it signals a glow-plug or engine management fault.
How Urgent Is the Glow Plug Light (Diesel)?
Urgency level for this indicator on the Honda Legend: low. Reading the colour is the fastest gut-check — a red symbol asks you to stop and investigate quickly, while amber or yellow means schedule a check soon rather than immediately. Green and blue symbols are simply telling you a system is active. Whatever the colour, the safest habit is to note when the Glow Plug Light (Diesel) appeared, how the Honda Legend is behaving, and whether the light is steady or flashing, because a flashing warning almost always means act now.
Common Symptoms Alongside the Glow Plug Light (Diesel)
Alongside the Glow Plug Light (Diesel), Honda Legend owners commonly report a handful of related signs. Some are obvious, others easy to miss until you pay attention. Keeping a short mental (or written) log of what the Honda Legend does when the light is on gives whoever performs the repair a huge head start and can save you money on diagnostic time.
- Light on briefly at cold start (normal)
- Flashing light after warm-up (fault)
- Hard starting when cold
- Rough running or white smoke on cold mornings
What Causes the Glow Plug Light (Diesel) to Come On?
The Glow Plug Light (Diesel) on the Honda Legend can be triggered by several conditions, and experienced technicians work through them from most to least likely. Some causes are trivial and cost almost nothing to correct, while others require replacing a sensor or component. The list below reflects what actually turns this light on in the real world, so you can gauge whether you are likely facing a quick fix or a workshop visit.
- Normal pre-heat cycle (steady, brief)
- One or more failed glow plugs
- Glow plug relay fault
- Crankshaft/camshaft sensor issue
- Related engine management fault
How to Fix the Glow Plug Light (Diesel) on a Honda Legend
Fixing the Glow Plug Light (Diesel) on a Honda Legend is methodical, not mysterious. Start with the quick, no-cost checks, then let the vehicle's own trouble codes guide you toward the specific system at fault. The ordered steps here are designed so that by the time you (or your technician) reach the more involved work, you have already eliminated the easy explanations.
- At cold start, wait for the light to go out before cranking
- If it flashes, scan for glow-plug and engine codes
- Test each glow plug for resistance/continuity
- Replace failed plugs (ideally as a set) and check the relay
- Clear codes and confirm easy cold starts
Is It Safe to Drive With the Glow Plug Light (Diesel) On?
Drivers ask this constantly, and the answer for the Honda Legend is nuanced. A steady amber Glow Plug Light (Diesel) with no change in how the car drives usually means you can continue carefully and get it looked at soon. A red or flashing Glow Plug Light (Diesel), unusual noises, warning messages, or a drop in performance are your cue to stop the Honda Legend safely and avoid further driving until the cause is known.
Diagnostic Trouble Codes Linked to the Glow Plug Light (Diesel)
If you scan a Honda Legend showing this light, these are the OBD-II trouble codes most commonly associated with it. The code you actually retrieve is what pinpoints the repair.
| Code | Meaning |
|---|---|
P0335 |
Crankshaft Position Sensor Circuit The crankshaft position sensor signal is faulty, which can cause stalling or a no-start condition. |
Professional Mechanic Tips
Do not ignore a flashing glow light; on many diesels it doubles as a general engine fault warning, so scan it rather than guessing.
Frequently Asked Questions
Why is the Glow Plug Light (Diesel) on in my Honda Legend?
On a Honda Legend, the Glow Plug Light (Diesel) comes on because a monitored value crossed a threshold the car considers abnormal. It could be a simple, inexpensive cause or a genuine fault — the only way to be sure is to scan the vehicle and interpret the codes rather than guess from the symbol alone.
Can I keep driving with the Glow Plug Light (Diesel) on?
For a Honda Legend, a steady amber Glow Plug Light (Diesel) with normal driving generally allows a careful trip to a garage. A red or flashing light, or any change in performance, means you should stop and avoid further driving until the fault is identified.
How much does it cost to fix the Glow Plug Light (Diesel) on a Honda Legend?
There is no single price for the Glow Plug Light (Diesel) on a Honda Legend; it ranges from a no-cost adjustment to a component replacement. The honest way to control cost is to diagnose the exact code before authorising any repair, so you only pay to fix what is actually wrong.
Will the Glow Plug Light (Diesel) reset itself on a Honda Legend?
Occasionally, yes — a Honda Legend can extinguish the Glow Plug Light (Diesel) by itself when the monitored value returns to normal. But a light that keeps coming back is a clear sign of an unresolved issue that needs a proper diagnosis rather than repeated resets.