P0202 is a generic OBD-II powertrain fault code that means Injector Circuit/Open Cylinder 2. The ECM/PCM has detected an electrical problem in the fuel injector circuit for Cylinder 2.
P0202 may be encountered on applicable vehicles from Ford, Toyota, Chevrolet, and Honda. The exact injector design, wiring arrangement, circuit monitoring strategy, and diagnostic procedure depend on the engine and model year.
Fault Code Description
P0202 = Injector Circuit/Open Cylinder 2.
Code type: Generic OBD-II Powertrain Code.
Likely fault location: Cylinder 2 fuel injector, injector connector, injector wiring, injector power supply, injector control circuit, or in rare cases the ECM/PCM injector driver.
The word Open indicates that the ECM/PCM has detected an interruption or abnormal electrical condition in the Cylinder 2 injector circuit. It does not automatically mean that the injector itself has failed.
What Does P0202 Mean?
The ECM/PCM controls the fuel injector for Cylinder 2 through an electrical circuit and monitors the circuit response. If the expected electrical condition is not detected, the control module can store P0202.
Possible electrical faults include an open wire, excessive resistance, poor connector contact, loss of injector power, a shorted circuit, or an internal injector fault.
Symptoms of P0202
- Check Engine Light.
- Engine misfire.
- Rough or unstable idle.
- Hesitation during acceleration.
- Loss of engine power.
- Poor fuel economy.
- Hard starting.
- Engine vibration.
- Engine stalling in severe cases.
- Flashing Check Engine Light when a severe misfire occurs.
Common Causes of P0202
- Faulty Cylinder 2 fuel injector.
- Open injector circuit.
- Broken injector control wire.
- Damaged injector connector.
- Loose or corroded terminals.
- High resistance in the injector circuit.
- Loss of injector power supply.
- Damaged wiring near the engine.
- Incorrect previous wiring repair.
- Engine vibration causing an intermittent connection.
- ECM/PCM injector driver fault.
How to Fix P0202
1. Scan the Vehicle
Confirm P0202 with a professional scan tool and check for additional injector, misfire, fuel-system, or electrical codes. Related codes may help identify whether the problem is isolated to Cylinder 2.
2. Identify Cylinder 2
Confirm the location of Cylinder 2 using the vehicle-specific service information. Cylinder numbering can differ between engine configurations.
3. Inspect the Injector Connector
Inspect the Cylinder 2 injector connector for loose terminals, corrosion, damaged locking tabs, contamination, or poor electrical contact.
4. Check Injector Power and Control
Use the correct wiring diagram to identify the injector power and control circuits. Verify the expected voltage and control signal according to the manufacturer's specifications.
5. Test Injector Resistance
Where permitted by the manufacturer, measure Cylinder 2 injector resistance and compare it with the specification for the exact injector and engine. Do not apply a generic resistance value to every vehicle.
6. Check the Wiring
Inspect the complete circuit between the injector and ECM/PCM. Look for broken wires, damaged insulation, high resistance, short circuits, and wiring damaged by heat or vibration.
7. Verify the ECM/PCM Driver
If the injector, connector, power supply, and wiring are confirmed to be correct, test the ECM/PCM injector driver according to the manufacturer's diagnostic procedure before considering module replacement.
P0202 Diagnostic Signal Flow
↓
Cylinder 2 Injector Control Circuit
↓
Injector Connector
↓
Cylinder 2 Fuel Injector
↓
Fuel Delivery
↓
Cylinder 2 Combustion
P0202 OBD Live Data
Use OBD live data to monitor engine RPM, misfire counters, fuel trims, and other available cylinder or injector-related parameters. Compare Cylinder 2 with the other cylinders where the scan tool provides cylinder-specific information.
Live data should be combined with electrical testing because P0202 is primarily an injector circuit fault. An intermittent wiring problem may not remain visible during a short scan.
P0202 Ford, Toyota, Chevrolet and Honda
P0202 has the same generic OBD-II definition on applicable Ford, Toyota, Chevrolet, and Honda vehicles, but the actual injector circuit, wiring layout, injector specifications, and control strategy can differ significantly between engines.
P0202 Ford
On applicable Ford vehicles, inspect the Cylinder 2 injector connector, wiring, power supply, and control circuit. Check for related misfire data before replacing the injector.
Use the exact Ford engine wiring diagram and injector specifications for electrical testing.
P0202 Toyota
On applicable Toyota vehicles, check the Cylinder 2 injector connector, injector circuit, power supply, and control signal. Compare injector and cylinder data where available.
Cylinder numbering and injector specifications must be confirmed for the specific Toyota engine.
P0202 Chevrolet
On applicable Chevrolet vehicles, inspect the Cylinder 2 injector and its electrical circuit for an open connection, damaged wiring, poor terminal contact, or abnormal injector resistance.
Check injector control operation before replacing the injector or ECM.
P0202 Honda
On applicable Honda vehicles, check the Cylinder 2 injector connector, wiring, power supply, and control circuit. Inspect for intermittent connections caused by heat or vibration.
Use Honda-specific wiring and injector specifications when performing electrical tests.
Is P0202 Serious?
P0202 can be serious if Cylinder 2 is not receiving the correct fuel delivery and the engine is misfiring. Severe misfires can cause poor drivability and may damage the catalytic converter on applicable gasoline engines.
Can I Drive With P0202?
Limited driving may be possible if the engine is operating normally, but the fault should be diagnosed promptly. If the Check Engine Light is flashing, the engine is severely misfiring, or there is significant loss of power, continued driving should be avoided.
P0202 Repair Cost
- Electrical diagnosis: approximately $50–$150+.
- Injector wiring repair: approximately $50–$250+.
- Fuel injector replacement: approximately $100–$500+ depending on the vehicle and injector type.
- ECM/PCM diagnosis or repair: can cost considerably more.
These are general estimates only. Actual repair costs depend on the vehicle, engine, injector type, parts prices, and labor rate.
Common Repair Mistakes
- Replacing the injector without testing the circuit.
- Ignoring the injector connector.
- Failing to verify injector power.
- Ignoring wiring damage near the engine.
- Using the wrong cylinder numbering.
- Replacing the ECM/PCM before testing the injector circuit.
- Ignoring related misfire codes.
Related Codes
- P0200 – Injector Circuit Malfunction.
- P0201 – Injector Circuit/Open Cylinder 1.
- P0203 – Injector Circuit/Open Cylinder 3.
- P0204 – Injector Circuit/Open Cylinder 4.
- P0302 – Cylinder 2 Misfire Detected.
FAQ About P0202
What does P0202 mean?
P0202 means Injector Circuit/Open Cylinder 2. The ECM/PCM has detected an abnormal electrical condition in the fuel injector circuit for Cylinder 2.
How do I fix P0202?
Confirm Cylinder 2, inspect the injector connector and wiring, test injector power and control, measure injector resistance where applicable, and verify the ECM/PCM control circuit before replacing components.
Can a bad injector cause P0202?
Yes. A defective Cylinder 2 injector can trigger P0202, but the injector should not be replaced until its electrical circuit, connector, and power supply have been tested.
Can wiring cause P0202?
Yes. An open wire, high resistance, damaged insulation, short circuit, or poor connector contact can interrupt Cylinder 2 injector operation and trigger P0202.
Can P0202 cause a misfire?
Yes. If Cylinder 2 does not receive the correct injector command or fuel delivery, the cylinder can misfire and cause rough running, hesitation, vibration, and loss of power.
Does P0202 mean the ECM is bad?
No. An ECM/PCM fault is possible but should generally be considered only after the injector, connector, power supply, wiring, and control circuit have been tested.
Is P0202 the same on Ford, Toyota, Chevrolet and Honda?
The base definition is generic across applicable vehicles, but the injector design, wiring, cylinder numbering, electrical specifications, and diagnostic procedure can differ between Ford, Toyota, Chevrolet, Honda, and different engine families.
Final Takeaway
P0202 should be approached as a Cylinder 2 injector circuit fault, not automatically as a failed fuel injector. The most reliable diagnosis is to test the injector, connector, power supply, wiring, control signal, and ECM/PCM driver in the correct sequence.
For applicable Ford, Toyota, Chevrolet, and Honda vehicles, identify the exact engine and Cylinder 2 location before testing. Vehicle-specific wiring diagrams and manufacturer specifications should be used to determine the actual source of the fault.