What Does P02EF Mean?
The ECM has detected that the Cylinder 2 fuel injector circuit is operating outside the expected electrical range or performance parameters. The injector driver current, voltage, or response time deviates from calibrated values, indicating altered electrical characteristics that affect fuel delivery precision for Cylinder 2.
Common Causes
35%
Degraded Cylinder 2 fuel injector with altered coil resistance or sluggish mechanical response affecting electrical circuit behavior
25%
High-resistance or corroded connections in the Cylinder 2 injector circuit wiring or connector
20%
ECM injector driver circuit malfunction producing incorrect current profile for Cylinder 2
20%
Wrong specification injector installed in Cylinder 2 with different impedance or flow characteristics
Diagnostic Steps
1
Step 1: Measure Cylinder 2 injector coil resistance and compare to specification and adjacent cylinders. A deviation greater than 10% from nominal indicates injector degradation.
2
Step 2: Capture Cylinder 2 injector current waveform with an oscilloscope and current clamp. Compare peak and hold current timing to known-good cylinders for anomalies.
3
Step 3: Inspect the Cylinder 2 injector connector for corrosion, bent pins, and terminal tension. Measure voltage drop across the connector during cranking or running.
4
Step 4: Swap the Cylinder 2 injector with a known-good cylinder. Clear codes and monitor. If the fault follows the injector, replace it with the correct specification part.
5
Step 5: If the vehicle uses individual injector coding (common on diesel and GDI systems), verify the injector calibration codes are correctly programmed in the ECM.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The ECM has detected that the Cylinder 2 fuel injector circuit is operating outside the expected electrical range or performance parameters. The injector driver current, voltage, or response time deviates from calibrated values, indicating altered electrical characteristics that affect fuel delivery...
The most common cause of P02EF (Cylinder 2 Injector Circuit Range/Performance) is: Degraded Cylinder 2 fuel injector with altered coil resistance or sluggish mechanical response affecting electrical circuit behavior
Typical repair costs for P02EF range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Imprecise Cylinder 2 fuel delivery causes rough running, misfire, elevated emissions, and potential catalytic converter damage from poor combustion efficiency.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02EF to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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