P0268 medium Severity

P0268: Cylinder 3 Fuel Injector Circuit High Voltage/Current

Engine misfire, rough idle, reduced power and efficiency

Overview

OBD-II P0268 indicates an electrical issue in the fuel injector circuit for cylinder #3, often high voltage or resistance, causing misfires and fueling imbalance.

Common Symptoms

  • Check Engine Light illuminated
  • Rough idling
  • Engine misfire on cylinder 3
  • Reduced engine power and acceleration
  • Increased fuel consumption

Most Common Causes

Faulty fuel injector (internal short or high resistance) high

Injector coil resistance outside specification often triggers high draw condition.

Damaged or corroded injector wiring or connector high

Open, short to voltage/ground, or poor connections increase circuit resistance or voltage.

ECM/injector control module malfunction medium

Rare but possible; causes incorrect drive signals or misinterpretation of circuit values.

Fuel pressure or fuel delivery anomalies affecting injector performance low

Less direct but can correlate with injector irregularities on some platforms.

Low battery or poor ground affecting injector circuit sensed values low

Conflicting community reports; not a primary manufacturer definition cause.

Diagnostic Steps

  1. Verify code with a scan tool and record freeze frame data
    Expected: P0268 present and no other overriding codes
    Interpretation: Confirms diagnostic starting point
  2. Perform visual inspection of cylinder #3 injector connector and harness
    Expected: No corrosion, broken wires, loose pins
    Interpretation: Damaged wiring often causes high voltage/resistance readings
  3. Measure injector coil resistance with multimeter
    Expected: Resistance within manufacturer spec (varies by model)
    Interpretation: Out‑of‑range indicates internal short or open
  4. Check supply voltage to injector connector with key on (engine off)
    Expected: Correct battery voltage at supply side
    Interpretation: No supply suggests wiring or ECM drive issue
  5. Use noid light or oscilloscope to check injector pulse while cranking
    Expected: Regular pulse pattern
    Interpretation: Irregular or absent pulses imply drive circuit fault
  6. If electrical tests are normal, swap injector with another cylinder (if applicable)
    Expected: Code follows or stays
    Interpretation: Helps isolate injector vs wiring/ECM

Repair Solutions

Repair or replace damaged wiring/connectors medium
Estimated Cost: $50 - $200

Connector pins, harness repair often resolves high resistance/voltage issues

Replace faulty fuel injector on cylinder 3 medium
Estimated Cost: $150 - $500

Injector replacement with correct part recommended

ECM/Injector control module diagnostic and repair hard
Estimated Cost: $400 - $1500

Necessary only if all circuit and injector tests are normal

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Misinterpreting generic injector misfire codes (e.g. P0303) as the root cause without electrical testing

Frequently Asked Questions

What is the definition of the P0268 engine code?

The P0268 code stands for Cylinder 3 Fuel Injector Circuit High Voltage/Current. This generally indicates an issue with the Fuel System system.

Reflecting on severity: How bad is P0268?

The P0268 code is considered medium severity. Engine misfire, rough idle, reduced power and efficiency

Symptoms associated with DTC P0268

Common symptoms include: Check Engine Light illuminated, Rough idling, Engine misfire on cylinder 3. You might also notice the Check Engine Light is on.

What parts fail when P0268 is set?

The most common causes are: Faulty fuel injector (internal short or high resistance), Damaged or corroded injector wiring or connector, ECM/injector control module malfunction.

How much does it cost to fix P0268?

It depends on what needs to be fixed. Repair or replace damaged wiring/connectors repairs are cheaper (~$200), while ECM/Injector control module diagnostic and repair repairs are on the higher end (~$1500).

Does code P0268 apply to Toyota vehicles?

Yes, P0268 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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