Faulty fuel injector on cylinder 8 with internal electrical failure or clogging; Damaged or corroded wiring harness connector at the injector; Open or short circuit in the injector control wire between the PCM and injector; Failed injector driver inside the powertrain control module (less common); Poor electrical connection at the PCM connector affecting the injector circuit; Mechanical issue such as a stuck injector pintle causing abnormal current draw

DTC codes / P02xx · Fuel and air metering (injector circuits) / P02F5

P02F5Cylinder 8 Injector Circuit Range/Performance

Q: What does code P02F5 mean?

Cylinder 8 Injector Circuit Range/Performance. P02F5 indicates that the powertrain control module has detected a range or performance problem with the fuel injector circuit for cylinder 8, meaning the electrical current flow through that injector does not match the expected profile during operation. The computer monitors the injector driver circuit for opens, shorts, or abnormal resistance and sets this code when the signal falls outside the calibrated window.

P02F5 indicates that the powertrain control module has detected a range or performance problem with the fuel injector circuit for cylinder 8, meaning the electrical current flow through that injector does not match the expected profile during operation. The computer monitors the injector driver circuit for opens, shorts, or abnormal resistance and sets this code when the signal falls outside the calibrated window.

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 sensation, especially noticeable at low speeds
Reduced engine power or hesitation during acceleration
Increased fuel consumption due to improper fuel delivery
Shaking or vibration from the engine bay that may worsen under load
In some cases, a flashing check engine light if the misfire becomes severe

Common causes, most likely first

Faulty fuel injector on cylinder 8 with internal electrical failure or clogging
Damaged or corroded wiring harness connector at the injector
Open or short circuit in the injector control wire between the PCM and injector
Failed injector driver inside the powertrain control module (less common)
Poor electrical connection at the PCM connector affecting the injector circuit
Mechanical issue such as a stuck injector pintle causing abnormal current draw

How to diagnose and fix it

Perform a visual inspection of the cylinder 8 injector connector and wiring for damage or corrosion
Use a scan tool to check for related misfire codes and freeze-frame data to confirm the fault
Measure the resistance of the cylinder 8 injector with a multimeter and compare to specifications
Check for voltage and ground signals at the injector connector with a noid light or oscilloscope
Inspect the wiring harness for continuity and shorts between the injector and PCM
Swap the cylinder 8 injector with a known-good injector from another cylinder to see if the code moves
If the injector and wiring test good, diagnose the PCM driver circuit or replace the PCM as a last resort

Don't overlook the injector connector

A loose or corroded injector connector is a frequent cause of this code that is often missed during visual inspections.
The code can be set by a mechanical injector problem that does not show up in a simple resistance test, so flow testing may be necessary.
A misfire from a bad spark plug or coil can sometimes mimic an injector circuit fault, so always check ignition components first.
The PCM may set this code intermittently if the injector coil is failing only when hot, so testing when the engine is at operating temperature is crucial.
After replacing an injector, the fuel trim and misfire counters should be cleared and rechecked to ensure the repair is complete.

Can I keep driving with P02F5?

You can drive the vehicle cautiously to a repair shop, but avoid heavy acceleration or towing loads because a misfiring cylinder can overheat the catalytic converter. If the check engine light is flashing, stop driving and seek immediate service.

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.