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 est un code defaut lie a electrique, classe en gravite low. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0670 et allume le voyant moteur.

Si ton vehicule a declenche P0670, tu peux remarquer un ou plusieurs de ces symptomes :

• 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

Voici les causes les plus courantes de P0670, classees selon la probabilite qu'elles soient en cause :

En general oui, pour des trajets courts. 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.

Suis ces etapes pour identifier la cause profonde de 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

Les couts de reparation de P0670 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :

P0670 se comporte differemment selon ton vehicule. Selectionne ta voiture ci-dessous pour des causes propres au modele, les problemes connus et des estimations de couts ajustees :

Ces codes apparaissent souvent avec P0670 ou indiquent des problemes connexes :