P0274 medium Severity

P0274: Cylinder 5 Injector Circuit High

May cause rough idle, misfire on cylinder 5, loss of power and increased emissions

Overview

P0274 generic OBD-II code indicating the engine control module has detected high voltage or abnormal current draw in the fuel injector circuit for cylinder #5, often due to wiring issues, faulty injector, or ECM driver problems

Common Symptoms

  • Check Engine Light illuminated
  • Rough idle and engine vibration
  • Loss of power or poor acceleration
  • Reduced fuel economy
  • Possible cylinder 5 misfire

Most Common Causes

Faulty cylinder 5 fuel injector high

Injector may have internal short or open causing abnormal current draw

Damaged or corroded wiring/connectors in injector 5 circuit high

Connector corrosion or chafed wiring can cause high circuit voltage readings

Poor ground or voltage supply issues medium

Poor ground or alternator/battery voltage spikes can impact injector circuit readings

Faulty ECM/PCM injector driver circuit medium

Internal driver transistor or MOSFET failure in the control module can set P0274

Diagnostic Steps

  1. Retrieve freeze-frame and live data with OBD-II scanner
    Expected: Record P0274 and look for related misfire codes (e.g., P0305)
    Interpretation: Confirms the code and checks if the issue is isolated to cylinder 5
  2. Visually inspect wiring and connectors to cylinder 5 injector
    Expected: Look for broken wires, corrosion, loose connectors
    Interpretation: If wiring damage is found, repair and retest
  3. Measure resistance of cylinder 5 injector with multimeter
    Expected: Injector resistance within manufacturer spec (e.g., ~11–18 ohms)
    Interpretation: Out-of-spec resistance suggests a faulty injector
  4. Perform voltage supply test at injector connector (engine running)
    Expected: Voltage within expected range (per OEM spec)
    Interpretation: High/abnormal voltage indicates wiring or PCM driver issue
  5. Swap suspected injector with another cylinder (if applicable)
    Expected: Code follows the injector if injector is faulty
    Interpretation: Helps distinguish between injector vs. wiring/ECM issue

Repair Solutions

Repair/replace damaged wiring and connectors for cylinder 5 injector medium
Estimated Cost: $50 - $200

Typical fix if wiring harness or connector is faulty

Replace cylinder 5 fuel injector medium
Estimated Cost: $200 - $600

Cost varies by vehicle and injector type

Replace or reprogram ECM/PCM if injector driver circuit is faulty hard
Estimated Cost: $800 - $1500

ECM replacement and programming may be required in rare cases

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming low fuel pressure or general misfire without checking cylinder-specific injector circuit
  • Replacing ECM without isolating wiring or injector fault

Frequently Asked Questions

What is the definition of the P0274 engine code?

When your OBD-II scanner reads P0274, it means: Cylinder 5 Injector Circuit High. This code is related to the vehicle's Fuel System.

Reflecting on severity: How bad is P0274?

You should treat P0274 as a medium issue. May cause rough idle, misfire on cylinder 5, loss of power and increased emissions

What happens when the P0274 code is active?

You may experience the following: Check Engine Light illuminated, Rough idle and engine vibration, Loss of power or poor acceleration.

Potential causes for OBDII code P0274

This code is frequently triggered by: Faulty cylinder 5 fuel injector, Damaged or corroded wiring/connectors in injector 5 circuit, Poor ground or voltage supply issues.

Is P0274 expensive to fix?

Expect to pay around $200 if the issue is a Repair/replace damaged wiring and connectors for cylinder 5 injector, but up to $1500 if the Replace or reprogram ECM/PCM if injector driver circuit is faulty needs replacement.

Is P0274 a generic or manufacturer-specific code?

Yes, P0274 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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