Cylinder 3 Injector Circuit Range/Performance
The P02F0 code indicates that the engine control module (ECM) has detected a malfunction in the electrical circuit or performance of the fuel injector for cylinder 3. This could be due to an open or short circuit, high resistance, or a faulty injector driver. The ECM monitors the injector circuit for proper voltage and current; when the readings fall outside the expected range, this code is set. This can lead to misfires, poor fuel economy, and increased emissions.
1. Most Common Causes
- Faulty fuel injector on cylinder 3 or injector resistance out of specification
- Injector wiring shorted to ground, shorted to voltage, or open circuit
- Injector connector corroded, with damaged pins, or high resistance due to oxidation
- Excessive resistance in the injector return or supply circuit
- Internal failure of the injector driver in the ECM/PCM
- Poor connection in the engine harness due to vibration or thermal degradation
2. Symptoms You Will Notice
- Engine misfire on cylinder 3
- Rough idle or hesitation during acceleration
- Check Engine Light illuminated
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect injector wiring and connector for damage or corrosion.
Step 3: Measure resistance of cylinder 3 injector (typically 11-18 ohms).
Step 4: Check for voltage and ground at injector connector with key on.
Step 5: Perform a cylinder contribution test to confirm misfire on cylinder 3.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause catalytic converter damage due to unburned fuel. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Repair costs vary: injector replacement $150-$400, wiring repair $100-$250, ECM replacement $500-$1000. Diagnosis typically $100-$150.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.