P0264 medium Severity

P0264: Cylinder 2 Injector Circuit Low

Engine may run rough, misfire, reduced power and increased fuel consumption

Overview

P0264 indicates a low voltage condition in the fuel injector circuit for cylinder #2 detected by the powertrain control module; common in many OBD‑II vehicles and often caused by wiring issues, connector problems, or injector faults

Common Symptoms

  • Illuminated check engine light
  • Rough engine idle
  • Engine misfire or hesitation
  • Reduced engine performance
  • Increased fuel consumption

Most Common Causes

Faulty fuel injector on cylinder 2 high

Injector fails to operate properly or draws low current

Damaged or corroded wiring/connectors in injector circuit high

Open or short in harness leads to low voltage detection

Poor electrical connection at injector medium

Loose pins or corrosion can reduce voltage signal

Powertrain control module (PCM) or control driver fault low

Rare cause, requires deeper ECU testing

Diagnostic Steps

  1. Connect OBD‑II scanner and verify P0264 is present, note any additional codes
    Expected: P0264 logged with or without related injector circuit codes
    Interpretation: Confirms relevant circuit issue and identifies additional context
  2. Perform a visual inspection of wiring and connectors at the number 2 injector
    Expected: No broken wires, corrosion, or loose terminals
    Interpretation: Visual defects would point to electrical connection issue
  3. Use multimeter to check voltage and resistance at injector terminals with key on
    Expected: Specified voltage present and resistance within factory range
    Interpretation: Normal values suggest wiring and PCM likely functional
  4. Listen for injector click or use injector tester to verify operation
    Expected: Audible clicking or proper injector firing pattern
    Interpretation: Lack of response indicates failed injector or driver circuit
  5. If wiring and injector check good, test PCM driver output using oscilloscope
    Expected: Expected pulse waveform
    Interpretation: Missing or abnormal waves suggest PCM or driver fault

Repair Solutions

Clean or tighten injector electrical connector easy
Estimated Cost: $10 - $50

Often fixes low voltage caused by poor contact

Repair or replace damaged wiring in injector circuit medium
Estimated Cost: $50 - $200

Cost depends on access and extent of wiring damage

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

Typical cost for part and labor; varies by vehicle

Test and replace PCM or control driver if defective hard
Estimated Cost: $500 - $1500

Last‑resort solution after ruling out wiring and injector

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Misdiagnosing as general misfire without checking specific injector circuit
  • Assuming injector replacement without testing wiring or control signals

Frequently Asked Questions

What is the definition of the P0264 engine code?

When your OBD-II scanner reads P0264, it means: Cylinder 2 Injector Circuit Low. This code is related to the vehicle's Fuel System.

Reflecting on severity: How bad is P0264?

You should treat P0264 as a medium issue. Engine may run rough, misfire, reduced power and increased fuel consumption

What happens when the P0264 code is active?

You may experience the following: Illuminated check engine light, Rough engine idle, Engine misfire or hesitation.

What parts fail when P0264 is set?

Potential culprits include: Faulty fuel injector on cylinder 2, Damaged or corroded wiring/connectors in injector circuit, Poor electrical connection at injector. A proper diagnosis is recommended.

Repair cost breakdown for P0264

It depends on what needs to be fixed. Clean or tighten injector electrical connector repairs are cheaper (~$50), while Test and replace PCM or control driver if defective repairs are on the higher end (~$1500).

Does code P0264 apply to Ford vehicles?

The P0264 code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

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