P0267
UniversalCylinder 3 Injector Circuit Low
Medium SeverityThe engine control module (ECM) has detected that the electrical circuit for the fuel injector on cylinder 3 has a lower than expected voltage or an open circuit. This issue typically causes the engine to misfire on cylinder 3, leading to noticeable rough idling and a reduction in overall engine performance.
⚠️ Before You Begin (Safety First)
Always exercise caution when working on a vehicle. Ensure the engine is cool before touching components and disconnect the battery to prevent electrical shock or accidental starting. Fuel systems are under pressure and contain flammable liquids; take precautions to avoid spills and fire hazards. Always use appropriate personal protective equipment.
Common Symptoms
- Check Engine Light illuminated
- Engine misfires
- Rough idling
- Reduced engine power
- Poor fuel economy
- Engine hesitation or stalling
Common Causes
- Faulty fuel injector for cylinder 3
- Open or short circuit in the wiring harness to cylinder 3 injector
- Corroded or loose electrical connector at the injector
- Faulty engine control module (ECM) - less common
Frequently reported on: General/Universal
Diagnostic Steps
- Inspect the wiring harness and connector for cylinder 3's fuel injector for any visible damage, corrosion, or loose connections. Secure or repair as needed.
- With the ignition off and battery disconnected, unplug the cylinder 3 fuel injector connector. Use a multimeter to measure the resistance across the injector's terminals. Compare this reading to the manufacturer's specifications (typically 10-18 ohms). Replace the injector if resistance is out of specification.
- Reconnect the battery and use a noid light (if available) to test for a pulse signal at the injector connector while cranking the engine. A flashing light indicates the ECM is sending a signal.
- With the ignition on (engine off), use a multimeter to check for 12V power at one of the injector connector terminals. The other terminal should receive a ground pulse from the ECM.
- If the injector resistance is good and power/ground pulse is present, consider swapping the cylinder 3 injector with an injector from another cylinder (if easily accessible) to see if the misfire moves. If it does, the injector is faulty.
- Clear the code and test drive the vehicle to see if the P0267 returns.
👨🔧 When to Call a Professional
If after performing basic visual inspections and electrical checks (like testing injector resistance and voltage at the connector), the fault remains unclear or diagnosis points to an intermittent wiring issue, it is best to consult a qualified automotive technician. Complex electrical diagnostics require specialized tools and expertise.
Commonly Asked Questions
Can I drive my car with a P0267 code?
While your car may still run, it is not recommended to drive for extended periods with a P0267 code. The misfire can damage the catalytic converter over time and reduce overall engine performance and fuel efficiency.
What is the most common cause of P0267?
The most common causes are a faulty fuel injector for cylinder 3 or a problem with the wiring harness connecting to that injector, such as an open circuit or corrosion.
How do I test the fuel injector for cylinder 3?
You can test the injector by measuring its electrical resistance with a multimeter (ignition off, injector unplugged). You can also use a noid light to check if the ECM is sending a pulse signal to the injector connector while cranking the engine.
Is replacing a fuel injector difficult for a DIY mechanic?
Replacing a fuel injector can range from moderately easy to challenging, depending on its location and the vehicle's design. It often involves removing other components to gain access and ensuring proper sealing upon reinstallation.
What tools will I need to diagnose P0267?
You will need a basic OBD-II scanner to read and clear codes, a multimeter for electrical testing, and potentially a noid light to check for injector pulse. Basic hand tools will be necessary for access and component removal.