P0264 Code Meaning and Next Steps

First checks take 10 to 20 minutes for the first checks. No special tools are usually needed for the first checks.

Can you keep driving?

Stop driving if any of these apply

!The check-engine light is flashing.
!The engine is shaking badly, stalling, or struggling to accelerate.

If the light is steady and the vehicle still drives normally: Maybe, but only for a very short distance if the engine still runs smoothly.

What to check first

Step-by-step checks

1
Free - no tools
Inspect the injector connector and harness for looseness, corrosion, or heat damage
2
Free - no tools
Check whether cylinder 2 shows a misfire or balance issue in scan data if available
3
Basic tool needed
Look for recently disturbed wiring or a connector that was not fully seated after service
4
Basic tool needed
If the injector was swapped during diagnosis, note whether the fault moved with it
5
Basic tool needed
Use caution around hot exhaust and moving engine parts while inspecting the area

If the code returns

-If the fault follows the injector, replacement becomes more likely than harness repair.
-If the code returns after connector repair, revisit the control circuit and continuity checks.
-If cylinder 2 still misfires after injector checks, compression and ignition testing become more important.

Background

What this code means

P0264 is a generic OBD-II injector circuit code for cylinder 2.

The fault can come from the injector, the harness, the connector, or the ECU driver side of the circuit.

A cylinder-specific misfire, rough idle, or weak acceleration can appear when the injector circuit is faulty.

Diagnosis

Common causes

Most common

Injector circuit wiring fault

A broken or shorted wire can interrupt injector operation.

Common

Loose or corroded connector

A poor connection can make the circuit fail intermittently.

Common

Failed injector

The injector may be electrically open or not opening properly.

Possible

Driver circuit issue

The ECU output may not be commanding the injector normally.

Avoid these mistakes

What not to do

xDo not keep driving if the engine is shaking badly or the check-engine light is flashing.
xDo not replace injector or solenoid parts before checking the connector, wiring, and fuel supply side.

Parts

Parts that may need replacing

PartTypical costNotes

Fuel injector$80-$300Relevant when the injector itself is confirmed bad.

Connector pigtail repair$15-$90Worth checking if the plug or pins are damaged.

Injector wiring repair$20-$160Useful if the harness has an open, short, or heat damage.

Related OBD codes

P0260

P0260 usually means injector circuit malfunction for cylinder 2.

P0261

P0261 usually means injector circuit malfunction for cylinder 1.

P0302

P0302 means cylinder 2 is misfiring.

Source notes

Generic OBD-II (SAE J1979 / ISO 15031-5). P0264 was expanded around common injector circuit faults, including wiring issues, connector problems, and injector failure.

This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.

This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.

Last reviewed: 2026-04-10

Reference: Open reference

P0264 - P0264 Usually Means Injector Circuit Malfunction for Cylinder 2