P0670: Glow Plug Control Module Circuit

P0670 is a diesel-only code meaning the engine control unit detected a fault in the glow plug control module circuit. The control module switches high current to the glow plugs that preheat the combustion chambers for cold starting and reports back to the ECU. The code points to the module itself, its supply or control wiring, or its ground rather than to one specific plug. Repairs typically run 70-350 EUR.

P0670 è un codice diagnostico di guasto relativo a impianto elettrico, classificato con gravità low. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0670 e accende la spia motore.

Se il tuo veicolo ha attivato P0670, potresti notare uno o più di questi sintomi:

• Check engine light or glow plug indicator illuminated
• Hard or extended cranking on cold starts
• White or grey smoke from the exhaust when starting cold
• Rough idle and misfire during the first minute after cold start
• Glow plug warning lamp flashing on some vehicles
• Will likely fail a diesel technical or emissions inspection

Ecco le cause più comuni di P0670, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. Safe to drive once the engine is warm. The glow plug control module only matters for cold starting a diesel, so the engine runs normally after warmup. Expect harder cold starts, longer cranking, and more white startup smoke. The car will likely fail a diesel inspection with this code stored.

Segui questi passaggi per individuare la causa principale di P0670:

1. Read the stored code and freeze frame with Skanyx or any ELM327 adapter to confirm P0670 and note the conditions when it set
2. Check the fuse feeding the glow plug control module, as a blown fuse can trigger the circuit fault
3. Verify battery voltage at the module power supply pin and confirm a clean ground with a multimeter
4. Inspect the connector and wiring between the ECU and the control module for corrosion, broken pins, or chafing
5. Bench-test the glow plugs themselves with a multimeter (a healthy plug reads roughly 0.5-2 ohm) to rule out a dead plug dragging down the circuit before condemning the module
6. Remember that detailed control module and per-plug status is manufacturer-extended (Mode $22) data that generic OBD2 does not expose, so module replacement is confirmed by supply, ground, and wiring checks plus the plug bench test

I costi di riparazione di P0670 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P0670 si comporta in modo diverso a seconda del tuo veicolo. Seleziona la tua auto qui sotto per cause specifiche del modello, problemi noti e stime dei costi adeguate:

Questi codici compaiono spesso insieme a P0670 o indicano problemi correlati: