P0381 Code: Glow Plug/Heater Circuit B Malfunction
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Qu'est-ce que cela signifie ?
Code P0381 indicates a malfunction in the glow plug/heater circuit (B Malfunction). Glow plugs are used in diesel engines to heat the combustion chamber for cold starts.
Diagnostic system: Misfire and combustion
On a Dodge Durango, the P0381 code should be diagnosed as part of the misfire and combustion group. Related codes and live data from this same system can change the repair priority, so avoid replacing parts from the code name alone.
Most Common Causes for Dodge Durango
- Bougie de préchauffage ou module défaillant (diesel)
- Faisceau de câblage endommagé ou cassé
- Connecteur électrique corrodé ou desserré
- Défaillance interne du PCM/ECM
Symptômes à surveiller
- Le voyant moteur est allumé
- Moteur diesel difficile à démarrer par temps froid
- Le voyant de préchauffage reste allumé (diesel)
- Fumée blanche ou bleue à l'échappement
- Ralenti irrégulier ou instable
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- Check spark plugs, coils, injector balance, and compression before replacing expensive parts.
- Review freeze-frame RPM/load to see when the misfire occurs.
- Look for fuel trim or vacuum leak codes that can cause multiple-cylinder misfires.
- Check for blown fuses, weak battery voltage, and damaged connectors before buying major parts.
Comment Diagnostiquer
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Replacing ignition coils without moving coils, checking plugs, or confirming fuel and compression are healthy. Always confirm the fault with freeze-frame data, live data, visual inspection, and circuit checks before spending money on parts.
CodePage.faq
Can I drive with the P0381 code?
If the check engine light is solid, you can usually drive to a safe location or mechanic. If the light is flashing, pull over immediately to prevent catastrophic engine or catalytic converter damage.
Will the P0381 code clear itself?
Once the underlying problem is fixed, the engine computer will run its self-checks. If it passes over several drive cycles, the light will turn off automatically. You can also clear it immediately using an OBD2 scanner.
Will this code fail an emissions test?
Yes. If the Check Engine Light is on due to the P0381 code, your Dodge will automatically fail an OBD2 plug-in emissions or smog test.
What should I check first for P0381?
Check spark plugs, coils, injector balance, and compression before replacing expensive parts. Review freeze-frame RPM/load to see when the misfire occurs. Look for fuel trim or vacuum leak codes that can cause multiple-cylinder misfires.
Join the Discussion
Estimation de réparation
Spark plug, coil swap test, or connector repair
Major component replacement after live data and circuit tests confirm failure
Comprend les pièces et la main-d'œuvre. Peut varier selon l'emplacement.
Single-cylinder ignition fixes are often affordable; compression or timing problems require professional diagnosis.
Difficulté de réparation (DIY)
Can usually be performed at home with basic hand tools.