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i have a Renault Megane 1.5 dci. I was on the motorway and my car went into limp mode, no warning lights came on dash or anything. I plugged in the obd reader and got a P0380 Glow plug/heater circuit A code. So I took it to mechanics and had all four glow plugs changed, however the car is still in limp mode and the same code shows. I did a proper diagnostic check from a mechanic and the same code P0380 still shows up. I don’t know what to do and ran out of ideas why this issue is occurring and why the car is in limp mode. Thank you.

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The P0830 indicates a clutch pedal switch fault. The glowplugs aren't involved. Especially if the engine is already warm (it happened on the motorway, as you told).

I don't think that your mechanic is acting in a professional manner when he changes all your glowplugs without further diagnosis (as they are quite easy to check, even if installed)

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  • My apologies i made a mistake it is meant to say P0380 not P0830, sorry for misunderstanding.
    – Steve Kole
    Commented Dec 10, 2020 at 14:59
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Here’s what I’d suggest:Check the Glow Plug Relay or Control Module: Sometimes, the issue is with the relay that controls the glow plugs. If the relay isn’t working properly, it could cause the P0380 code to keep popping up, even with new plugs.Inspect the Wiring: There might be a problem with the wiring between the glow plugs and the control unit. Look for any signs of damaged wires, loose connections, or corrosion that could be causing a bad connection.Consider the ECU: In rare cases, the ECU (engine control unit) might be sending incorrect signals or misinterpreting the inputs, causing the car to go into limp mode.

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