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P0380 – Glow Plug Circuit – Renault/Dacia 1.5 dCi (Renault / Dacia 1.5 dCi K9K)

Fault code P0380 means "Glow Plug Circuit – Renault/Dacia 1.5 dCi". It is common on 1.5 dCi K9K, 1.6 dCi R9M, Dacia Logan, Sandero, Duster 1.5 dCi engines. Below are the real-world causes, step-by-step tests and OEM part numbers.

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P0380 quick summary

Fault codeP0380
MeaningGlow Plug Circuit – Renault/Dacia 1.5 dCi
SystemPowertrain (Engine & Transmission)
VehiclesRenault / Dacia
Common on1.5 dCi K9K, 1.6 dCi R9M, Dacia Logan, Sandero, Duster 1.5 dCi
SeverityLow
Can I drive?Yes. In mild weather the engine starts normally; in cold weather starting gets hard.
Repair cost€40 – €350

Symptoms of P0380

  • Hard starting when cold
  • White smoke after a cold start
  • Glow plug light stays on or flashes
  • Engine warning light
  • No symptoms in summer

Most common causes of P0380 (most likely first)

Mechanic's Pro Tip

On the K9K a faulty glow plug control unit (preheating relay) is as common as a failed glow plug. Measure each plug first; if all are fine, check the control unit's supply, ground and connector for corrosion. Remove the glow plugs only when the engine is warm.

  1. 1.Failed glow plug

    Most likely

  2. 2.Faulty glow plug control unit (preheating relay)

  3. 3.Corroded connector or wiring

  4. 4.Blown fuse in the preheating supply

  5. 5.Wrong glow plug type

Step-by-step diagnostic guide

  1. 1

    Read the fault memory and note which cylinder or circuit is affected.

  2. 2

    Measure the resistance of each glow plug.

  3. 3

    Check the glow plug control unit supply, ground and connectors.

  4. 4

    Check the fuse and wiring.

  5. 5

    Replace the faulty part, clear codes and test on a cold start.

How do I read fault codes? →Where the OBD2 port is, which scanner to use and how to read and clear codes step by step.

Frequently asked questions

Is a glow plug fault urgent?

Not urgent, but starting in winter gets harder and the engine produces more soot, which loads the DPF.

Should I replace all glow plugs?

On high mileage it makes sense to replace the set, because they age at the same rate.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.