P0276 — Cylinder 6 Injector Circuit Low

Causes

• Short to ground in injector wiring harness for cylinder 6
• Corroded or loose connector/terminal at the injector
• Failed fuel injector (internal short)
• Faulty PCM/engine control module injector driver
• Bad engine/chassis ground or power supply feeding injector circuit
• Water intrusion or damaged insulation in harness

Symptoms

• MIL (Check Engine Light) illuminated
• Rough idle or cylinder-specific misfire
• Reduced engine power, hesitation or stumble under load
• Increased fuel consumption and emissions
• Hard starting or extended crank time
• Possible smoke from exhaust (diesel engines)

What to check

• Read freeze frame and live data with a scan tool; confirm which cylinder flagged
• Visual inspection of injector connectors, wiring harness, and ground points for damage or corrosion
• Backprobe injector connector; measure voltage with key ON, engine OFF and during cranking
• Measure injector coil resistance with ohmmeter (compare to spec)
• Use a noid light or lab scope to verify injector drive pulse and waveform at crank/run
• Check continuity and insulation resistance between injector pin and PCM connector

Signal parameters

• Key ON, engine OFF: injector supply (battery feed) ≈ battery voltage (~12 V)
• Injector coil resistance (typical gasoline): ~2–16 Ω (check OEM spec for exact value)
• Injector driver output: low-side switching; expect near battery voltage at injector pin when driver OFF, and pulled to ground (0–1 V) when pulsed ON
• Noid light should flash during cranking/run; oscilloscope should show clean pulse waveform (pulse width varies with load/RPM)
• Short to ground will show near 0 V at injector pin when driver not commanding or abnormal low resistance to ground

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