P0276 medium Severity

P0276: Cylinder 6 Injector Circuit Low

May cause rough idle, misfire on cylinder 6, reduced power, increased fuel consumption and illuminated Check Engine Light

Overview

P0276 indicates a low voltage condition in the electrical circuit controlling the fuel injector for cylinder 6. Typical causes include wiring/connectors, injector fault, or ECU driver circuit issues.

Common Symptoms

  • Check Engine Light (MIL) illuminated
  • Rough idle or engine vibration
  • Loss of engine power or hesitation
  • Increased fuel consumption
  • Intermittent misfire or hesitation
  • Possible stalling under load

Most Common Causes

Damaged or corroded wiring harness/connector to cylinder 6 injector high

Electrical connection issues are frequently reported across sources as a root cause.

Faulty cylinder 6 fuel injector medium

Injector internal fault or clog may draw incorrect current.

Faulty ECM/PCM injector driver circuit medium

Driver transistor inside control module can fail and cause low voltage indication.

Open circuit or short to ground in injector circuit medium

Wiring damage causing low voltage signal.

Blown fuse or relay affecting injector power low

Less common but possible interruption in power supply.

Diagnostic Steps

  1. Connect OBD-II scanner and read live data for cylinder 6 injector
    Expected: Low voltage or erratic signal on injector circuit
    Interpretation: Confirms that PCM is reporting low circuit voltage
  2. Visually inspect wiring harness and connector for cylinder 6 injector
    Expected: No corrosion, broken wires or loose pins
    Interpretation: Damaged or corroded connectors likely cause; repair or replace
  3. Perform continuity and resistance tests on injector circuit with multimeter
    Expected: Continuity within manufacturer specification
    Interpretation: Open or high resistance indicates wiring fault
  4. Test injector operation with noid light or injector tester
    Expected: Injector receives proper signal pulses
    Interpretation: Lack of pulses suggests ECM driver or wiring fault
  5. Swap injector 6 with another cylinder injector (if possible)
    Expected: Code moves to swapped cylinder if injector is at fault
    Interpretation: Helps isolate faulty injector vs wiring/ECM

Repair Solutions

Repair or replace damaged wiring/connectors medium
Estimated Cost: $50 - $250

Connector cleaning and wiring repair are common and often resolve the issue

Replace faulty cylinder 6 fuel injector medium
Estimated Cost: $200 - $600

Injector replacement needed if internal failure is confirmed

Replace ECM/PCM or repair injector driver circuit hard
Estimated Cost: $600 - $1200

Considered only after all wiring and injector tests are complete

Replace blown fuse or relay if identified easy
Estimated Cost: $5 - $50

Simple checks should be performed early in diagnostics

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming the fuel injector itself is faulty when the real issue is wiring or connector corrosion
  • Replacing ECM/PCM without verifying wiring harness and injector operation

Frequently Asked Questions

What does a P0276 diagnostic trouble code signify?

The P0276 code stands for Cylinder 6 Injector Circuit Low. This generally indicates an issue with the Fuel System system.

Can P0276 cause engine damage?

You should treat P0276 as a medium issue. May cause rough idle, misfire on cylinder 6, reduced power, increased fuel consumption and illuminated Check Engine Light

What are the symptoms of P0276?

You may experience the following: Check Engine Light (MIL) illuminated, Rough idle or engine vibration, Loss of engine power or hesitation.

What parts fail when P0276 is set?

The most common causes are: Damaged or corroded wiring harness/connector to cylinder 6 injector, Faulty cylinder 6 fuel injector, Faulty ECM/PCM injector driver circuit.

How much does it cost to fix P0276?

Expect to pay around $50 if the issue is a Replace blown fuse or relay if identified, but up to $1200 if the Replace ECM/PCM or repair injector driver circuit needs replacement.

Is P0276 a generic or manufacturer-specific code?

This is a universal code. You might see P0276 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

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