What it means
The control module detects a high condition in the cylinder 5 injector circuit. This indicates an electrical circuit fault; it does not by itself show that injector flow is affecting other cylinders.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The engine control module controls and monitors the fuel injector circuit for cylinder 5. P0274 means the circuit signal is higher than expected, which may indicate a short to voltage, an open or high-resistance connection, or a driver fault; it does not establish that other cylinders are affected.
Common causes
Most likely first.
- Open or high-resistance injector circuit
- Short to voltage in injector wiring
- Faulty cylinder 5 injector
- Control module driver fault
Symptoms
- Check-engine light
- Rough idle or misfire
- Reduced power
- Increased fuel consumption
How to diagnose it
- Record freeze-frame data and check cylinder 5 misfire counts and available injector command data to see when the high condition occurs.
- With the ignition off, inspect the cylinder 5 injector connector and wiring for corrosion, loose pins, damaged insulation, or contact with a power source.
- Check the cylinder 5 injector circuit for a short to voltage, an open, or high resistance using the wiring diagram and manufacturer's procedure.
- Test the cylinder 5 injector winding and compare it with the manufacturer's specification.
- If the injector and harness pass, test the control module's cylinder 5 driver and connections.
Common fixes
- Repair wiring shorted to a power source or damaged insulation in the cylinder 5 injector circuit.
- Clean and secure the connector or repair corroded or loose terminals.
- Replace the cylinder 5 injector if it fails the manufacturer's electrical test.
- Repair the control module driver only after confirming the rest of the circuit is sound.
Can I keep driving?
Limit driving if the engine misfires or runs roughly, since continued poor combustion can damage the catalytic converter. Avoid heavy acceleration and stop if the engine shakes severely or loses substantial power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.