Cylinder 5 Injector Circuit High
What does P0274 mean?
The P0274 code means the vehicle's onboard diagnostic system has detected: Cylinder 5 Injector Circuit High. This is a moderate severity code.
Common Symptoms
- Engine misfire on cylinder 5
- Rough idle and vibration
- Check Engine Light illuminated
- Dead cylinder 5
- Poor acceleration
Probable Causes (Ranked by Likelihood)
- Open circuit in cylinder 5 injector wiring Very High
- Faulty cylinder 5 fuel injector (open coil) High
- Disconnected or corroded injector connector High
- Broken ground wire to injector Moderate
- PCM injector driver circuit failure Low
Step-by-Step Diagnostic Procedure
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Measure cylinder 5 injector resistance -- an open reading (OL) confirms a burnt-out coil
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Check for 12V power at the injector connector with key on
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Test for PCM ground pulse at the connector using a noid light during cranking
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Inspect the connector and harness for damage, especially on rear-bank cylinders near the firewall
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Replace injector if coil is open; repair wiring if a break is found in the circuit
Frequently Asked Questions
Can I drive with code P0274?
You can drive short distances. On larger engines, one dead cylinder is less impactful, but the misfire should be repaired to prevent exhaust system damage.
Is cylinder 5 hard to access for repair?
On V-configuration engines, cylinder 5 is often on the rear bank near the firewall, making it more difficult to access. This can increase labor time and cost for injector replacement.
Can a corroded connector cause an open circuit reading?
Yes. Severe corrosion on the connector pins can create so much resistance that the circuit effectively behaves as open, even though the wires are physically connected.