Pick a colour. The page changes, like the app does.
Officially? A wall of jargon. To most people? Absolutely nothing. That's exactly why we built the app.
Plug into any code reader and you'll get the same line every other app shows you. Technically correct. Practically useless.
"The ECU has spotted a fault in the circuit it uses to control the glow plug module. The module (or relay on some cars) switches power to the diesel's cold-start heaters, and the ECU tells it when to glow. So this code is about that control side, not one plug. Start cheap: check the connectors at the module and the fuse. Then look at the wiring between the module and the ECU. If those are fine, the module itself is the likely buy. Expect the same symptoms as a glow plug fault: long cranking when cold and smoke at start-up, and often nothing in mild weather."
Worth checking in roughly this order. Don't jump straight to the expensive fix:
The code itself is a snapshot. The fault sets after the car's watched the numbers over a whole drive cycle. Here's what's worth keeping an eye on:
Live simulation on the readings our free demo drive supports. This is how the app’s dials move.
Codes rarely tell the whole story. The clever part is reading them together, and against your exact car. Here's the kind of thing it catches:
The ECU has spotted a fault in the circuit it uses to control the glow plug module. The module (or relay on some cars) switches power to the diesel's cold-start heaters, and the ECU tells it when to glow. So this code is about that control side, not one plug. Start cheap: check the connectors at the module and the fuse. Then look at the wiring between the module and the ECU. If those are fine, the module itself is the likely buy. Expect the same symptoms as a glow plug fault: long cranking when cold and smoke at start-up, and often nothing in mild weather.
Yes, it's safe to drive. It may be hard to start in the cold, so get it looked at soon. Once the engine is warm, the glow system has little effect on how it drives.
P0670 points at the control side: the module and its link to the ECU. P0380 points at the glow plug circuit itself. They often turn up together, and a shorted glow plug can cause both.
A fuse or a cleaned connector costs next to nothing. A new glow plug module or relay is usually a mid-priced part, and varies by car. Test the glow plugs first so a shorted plug doesn't kill the new module.
Free app. Plug in, and get every code in plain English, plus the connections you'd never spot.