01 6-Speed DSG Automatic Transmission Common Faults: Causes, S… • 02 This Is Why Your Car Randomly Shakes At Idle Even Without W… • 03 Troubleshooting Your Refrigerator: A Comprehensive Guide • 04 Can You Change Your Bike's Disc Brake into a Drum Brake? • 05 General Motors: A History of Innovation and Leadership • 06 The Science of Flight: How Aircraft Stay in the Air • 07 Tom Cruise Is Back Behind The Wheel: Days Of Thunder 2 Anno… • 08 Why Engine Knock Happens and How It Affects Performance • 09 Bright Solutions: Resolving the Mystery of Dim Car Headligh… • 10 Why Engine Capacity Matters When Shopping For A New Car •

DTC codes / P02xx · Fuel and air metering (injector circuits) / P0274

P0274Cylinder 5 Injector Circuit High

P0274 means the engine computer has detected an abnormally high current flow in the electrical circuit that operates the fuel injector for cylinder 5. The computer monitors the injector driver circuit and flags this code when the current exceeds the expected range, indicating a short to power, a shorted injector coil, or a wiring fault that is allowing too much current to pass.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Rough idle or misfire that may feel like a shake or stumble
  • Loss of power or hesitation during acceleration
  • Poor fuel economy due to incomplete combustion in cylinder 5
  • Possible fuel smell from the exhaust if the injector is stuck open
  • In some cases, the engine may enter limp mode or shut down the affected cylinder

Common causes, most likely first

  1. Short to power in the injector wiring harness between the computer and the injector
  2. Faulty fuel injector with an internally shorted coil
  3. Corroded or damaged electrical connector at the injector or computer
  4. Chafed or pinched wires in the harness causing a short to voltage
  5. Failed injector driver inside the engine computer (less common)
  6. Aftermarket or damaged electrical accessories wired incorrectly near the injector circuit

How to diagnose and fix it

  1. Scan all modules for stored codes and record freeze-frame data to confirm the fault is current
  2. Visually inspect the cylinder 5 injector connector and wiring for damage, corrosion, or chafing
  3. Disconnect the injector and measure resistance across its terminals; compare to the manufacturer's specification
  4. With the injector disconnected and key on, check for voltage on the control wire that should not be present
  5. Inspect the harness along its route for shorts to power, especially near hot or moving components
  6. If wiring and injector test good, check the computer's injector driver circuit with a noid light or oscilloscope
  7. Replace the faulty injector or repair the wiring as needed, then clear codes and verify the repair

What a high injector circuit really means

  • A high current code often points to a short to power in the harness rather than a failed injector, so always inspect the wiring before replacing parts.
  • The injector coil can test good with a multimeter yet still short internally when hot, so a resistance check alone may not be conclusive.
  • A shorted injector can flood the cylinder with fuel, leading to bore wash and accelerated engine wear if driven for long.
  • Some vehicles use a shared power feed for multiple injectors, so a short in one circuit can affect others and set companion codes.
  • The computer's injector driver can be damaged by a shorted injector, so replacing only the injector without checking the driver may lead to a repeat failure.

Can I keep driving with P0274?

You can usually drive the vehicle a short distance to a repair shop, but avoid heavy acceleration or long trips because a shorted injector can cause fuel dilution and engine damage. If the engine is misfiring severely or you smell raw fuel, stop driving and have the vehicle towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage