DTC P0278 Cylinder 6 Contribution/Balance Fault

As a devoted car owner, you understand the importance of maintaining your vehicle’s performance. DTC P0278, pertaining to “Cylinder 6 Contribution/Balance Fault,” is a concern that can impact the equilibrium of fuel delivery to Cylinder 6 in your engine. This comprehensive guide aims to delve into the causes, symptoms, inspection techniques, resolutions, and the process of clearing DTC P0278. Equipped with this knowledge, you can confidently address the issue and ensure your engine functions optimally.

1. Causes of DTC P0278:

DTC P0278 is triggered when the engine control module detects an issue with the contribution or balance of fuel delivery to Cylinder 6. Several factors can contribute to this concern:

  • Faulty Injector: A malfunctioning injector in Cylinder 6 can lead to uneven fuel delivery.
  • Fuel Pressure Irregularities: Fluctuations in fuel pressure can disrupt the balance of fuel among cylinders.
  • Wiring Issues: Damaged or corroded wiring can impact injector operation and fuel delivery balance.
  • Injector Timing Issues: Incorrect injector timing can result in an imbalance in fuel delivery.

2. Symptoms of DTC P0278:

Being attuned to potential symptoms can aid in identifying the issue promptly:

  • Engine Misfires: Cylinder 6 might experience misfires or hesitation due to an imbalance in fuel delivery.
  • Rough Idling: The engine might display rough idling or vibration, particularly when Cylinder 6 is affected.
  • Reduced Power: The overall power and performance of your vehicle could decrease due to the imbalance in Cylinder 6’s contribution.

3. Inspection of DTC P0278:

Conducting a comprehensive inspection is vital for accurate diagnosis of the contribution/balance fault:

  • Visual Examination: Inspect the wiring and connectors of Cylinder 6’s injector for any damage or corrosion.
  • Injector Testing: Test the performance of the injector in Cylinder 6 to ensure proper fuel delivery.
  • Fuel Pressure Check: Evaluate fuel pressure to determine if irregularities are causing the imbalance.
  • Wiring Check: Inspect the injector circuit wiring for any damage, corrosion, or loose connections.

4. Resolving Causes of DTC P0278:

Based on your inspection, take these steps to address the contribution/balance fault:

  • Replace Faulty Injector: If the injector in Cylinder 6 is faulty, replace it with a compatible replacement.
  • Repair Wiring and Connections: Rectify any damaged wiring or connectors in the injector circuit.
  • Address Fuel Pressure Issues: If fuel pressure irregularities are responsible, address the root cause.
  • Injector Timing Adjustment: Ensure proper timing of injector operation to balance fuel delivery.

5. Clearing DTC P0278:

After addressing the root cause of the contribution/balance fault, clear the code and reset the check engine light:

  • OBD-II Scanner: Utilize an OBD-II scanner to clear the code and turn off the check engine light.
  • Test Drive: Take the vehicle for a test drive to confirm resolution and that the light remains off.


Addressing issues like DTC P0278 illustrates your dedication to maintaining your vehicle’s performance. Staying informed about potential problems contributes to the longevity and efficiency of your vehicle. Responsible car ownership encompasses both enjoying the driving experience and ensuring the health of your engine’s components. This guide stands as your resource throughout your journey as a car owner, even when addressing contribution/balance faults in specific cylinders.