DTC P0262 Cylinder 1 Injector Circuit High

Being an attentive car owner means understanding potential issues that can impact your vehicle’s performance. DTC P0262, related to “Cylinder 1 Injector Circuit High,” is a concern that can affect the fuel delivery to a specific Cylinder in your engine. In this comprehensive guide, we will delve into the causes, symptoms, inspection methods, resolutions, and the process of clearing DTC P0262. With this knowledge, you can confidently address the issue and ensure optimal engine performance.

1. Causes of DTC P0262:

DTC P0262 is triggered when the engine control module detects a high voltage signal in the injector circuit of Cylinder 1. Several factors can contribute to this issue:

  • Faulty Injector: A malfunctioning injector in Cylinder 1 can lead to excessive fuel delivery.
  • Wiring Issues: Wiring problems, such as damaged or corroded wires, can result in unintended high voltage readings.
  • Poor Connections: Loose or poor connections in the injector circuit can lead to erratic voltage readings.
  • Faulty Engine Control Module (ECM): An issue with the ECM responsible for controlling fuel injection can cause high voltage.

2. Symptoms of DTC P0262:

Recognizing potential symptoms can help you identify the issue promptly:

  • Engine Misfires: Cylinder 1 might experience intermittent misfires or hesitation during acceleration due to excessive fuel delivery.
  • Reduced Power: Your vehicle’s overall power and performance might decrease due to improper fuel delivery.
  • Rich Exhaust Odor: Unburned fuel from excessive delivery can lead to a noticeable rich odor from the exhaust.

3. Inspection of DTC P0262:

Conducting a thorough inspection is vital for accurate diagnosis of the high voltage issue:

  • Visual Examination: Inspect the wiring and connectors of Cylinder 1’s injector for any damage or corrosion.
  • Injector Testing: Test the performance of the injector in Cylinder 1 to determine if excessive fuel delivery is occurring.
  • 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 P0262:

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

  • Replace Faulty Injector: If the injector in Cylinder 1 is faulty and causing excessive fuel delivery, replace it with a compatible replacement.
  • Repair Wiring and Connections: Fix 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 high voltage issue, consider replacing it with a compatible unit.

5. Clearing DTC P0262:

After resolving the root cause of the high voltage issue, clear the code and reset the check engine light:

  • OBD-II Scanner: Use 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 that the issue has been resolved and the light remains off.


Addressing issues like DTC P0262 showcases 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 is here to support every step of your journey as a car owner.