DTC P0294: Cylinder 12 Injector Circuit Low

Your dedication to maintaining the optimal performance of your vehicle is commendable, and being well-informed about potential issues is essential. DTC P0294, related to “Cylinder 12 Injector Circuit Low,” is a concern that can disrupt the proper fuel delivery to Cylinder 12 in your engine. In this comprehensive guide, we will delve into the causes, symptoms, inspection methods, resolutions, and the process of clearing DTC P0294. With this knowledge, you can confidently address the issue and ensure your engine operates optimally.

1. Causes of DTC P0294:

DTC P0294 is triggered when the engine control module detects a low voltage signal in the injector circuit of Cylinder 12. Several factors can contribute to this issue:

  • Faulty Injector: A malfunctioning injector in Cylinder 12 can lead to inadequate fuel delivery.
  • Wiring Issues: Damaged or corroded wiring can disrupt the electrical signal to the injector.
  • Poor Connections: Loose or poor connections in the injector circuit can result in low voltage readings.
  • Faulty Engine Control Module (ECM): An issue with the ECM responsible for controlling fuel injection can cause low voltage.

2. Symptoms of DTC P0294:

Recognizing potential symptoms can help you identify the issue promptly:

  • Engine Misfires: Cylinder 12 might experience intermittent misfires or hesitation due to inadequate fuel delivery.
  • Rough Idling: The engine might display rough idling or vibration, particularly when Cylinder 12 is affected.
  • Reduced Power: Your vehicle’s overall power and performance could decrease due to inadequate fuel delivery to Cylinder 12.

3. Inspection of DTC P0294:

A thorough inspection is vital for accurately diagnosing the low voltage issue:

  • Visual Examination: Inspect the wiring and connectors of Cylinder 12’s injector for any damage or corrosion.
  • Injector Testing: Test the performance of the injector in Cylinder 12 to ensure proper fuel delivery.
  • Wiring Check: Inspect the injector circuit wiring for any damage, corrosion, or loose connections.
  • ECM Check: Evaluate the ECM’s functionality to ensure it’s properly controlling fuel injection.

4. Resolving Causes of DTC P0294:

Based on your inspection, take these steps to address the low voltage issue:

  • Replace Faulty Injector: If the injector in Cylinder 12 is faulty and causing inadequate fuel delivery, replace it with a compatible replacement.
  • Repair Wiring and Connections: Rectify any damaged wiring or connectors in the injector circuit.
  • Ensure Proper Connections: Ensure all connections in the injector circuit are secure and properly seated.
  • ECM Replacement: If the ECM is found to be faulty and causing the low voltage issue, consider replacing it with a compatible unit.

5. Clearing DTC P0294:

After resolving the root cause of the low voltage issue, 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.


By taking proactive steps to address issues like DTC P0294, you demonstrate your commitment to maintaining your vehicle’s performance. Staying informed about potential problems contributes to the longevity and efficiency of your vehicle. Responsible car ownership involves both enjoying the driving experience and ensuring the health of your engine’s components. This guide serves as your support throughout your journey as a car owner, even when dealing with injector circuit low issues in specific cylinders like Cylinder 12.