EGI Glow Plug Secondary Failure
The glow plug system that pre-heats the diesel engine isn't working properly on the secondary circuit, like a backup heater that's failed. Your engine may struggle to start or run rough, especially in cold weather.
The ECU monitors glow plug circuit resistance and voltage during the glow plug preheat cycle. It detects open circuits, shorts, or excessive resistance in the secondary glow plug relay or wiring. If voltage or current falls outside normal operating ranges, a fault is logged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Glow Plug Circuit Voltage | 11-14V during preheat cycle | <10V or >15V indicates secondary failure |
| Glow Plug Resistance | 0.5-2 ohms per plug | >5 ohms or open circuit detected |
Code P1430 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1430 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.