P0264

Universal

Cylinder 2 Injector Circuit Low

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The engine computer has detected a low electrical signal in the circuit for the cylinder 2 fuel injector. The injector meters fuel into the engine; if its circuit cannot operate as expected, cylinder 2 may receive too little or no fuel, which can cause rough running, a misfire, or reduced power. The code identifies a detected circuit condition, not proof that the injector itself has failed.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the engine is shaking severely, losing power, or the check-engine light is flashing, stop driving when it is safe to do so and arrange diagnosis. Continued driving with a significant misfire can damage the catalytic converter. Do not disconnect or test injector wiring while the engine is running.

Common Symptoms

  • The check-engine light may turn on.
  • The engine may idle roughly or misfire if cylinder 2 is not receiving the expected fuel.
  • The vehicle may have reduced power or hesitate during acceleration.
  • Fuel economy may worsen if engine operation is disrupted.
  • There may be no obvious symptoms if the condition is intermittent or has little effect on engine operation.

Common Causes

  • A damaged, corroded, loose, or poorly connected cylinder 2 injector connector or wiring may disrupt the circuit.
  • A short to ground or other wiring fault may cause the circuit signal to be low.
  • The injector coil or internal injector connection may have an electrical fault.
  • A fault in the power supply or engine computer injector-control circuit may affect the signal.
  • An intermittent connection or wiring fault may cause the condition to appear only under some circumstances.

Diagnostic Steps

  1. Check whether the engine is running roughly and whether the check-engine light is flashing. If the engine is shaking severely or the light is flashing, avoid continued driving and arrange diagnosis.
  2. With the engine off and cool, visually inspect the accessible cylinder 2 injector connector and nearby wiring for looseness, corrosion, chafing, or visible damage. Do not pull on wires or force a connector.
  3. If you have a compatible scan tool, note other codes and available freeze-frame information before clearing anything. Related codes or operating conditions can help narrow down whether the problem is isolated or part of a broader electrical issue.
  4. Do not replace the injector based on this code alone. Injector and circuit testing should follow the vehicle-specific wiring diagram; leave electrical measurements or computer-driver testing to a qualified technician if you lack the correct equipment or procedure.

When to Call a Professional

A technician can compare cylinder-specific scan data, inspect the injector connector and harness, and test the circuit and injector using the vehicle's wiring diagram and suitable equipment. Checking the engine computer's injector driver may also be appropriate after the injector, wiring, and connections have been assessed. Exact procedures depend on the vehicle's model, year, and engine.

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Commonly Asked Questions

Does P0264 prove that the cylinder 2 injector needs replacement?

No. The code reports a low signal in the cylinder 2 injector circuit. A connector, wiring fault, supply problem, injector electrical fault, or control-circuit problem could be involved.

What does “circuit low” mean in this code?

It means the engine computer detected a signal it considers low in the cylinder 2 injector circuit. The exact monitoring method and expected signal depend on the vehicle.

Can I keep driving with P0264?

It depends on how the engine is running. If there is severe shaking, substantial power loss, or a flashing check-engine light, stop when safe and arrange diagnosis because a significant misfire can damage the catalytic converter.

Could a wiring problem cause symptoms that come and go?

Yes. A loose connector or damaged wire may make intermittent contact, so the fault or rough running may appear only under certain conditions.

Can the code be diagnosed the same way on every vehicle?

No. The relevant wiring, circuit design, and test procedure vary by model, year, and engine. Vehicle-specific service information is needed for detailed testing.

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