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DTC codes / P02xx · Fuel and air metering (injector circuits) / P0276

P0276Cylinder 6 Injector Circuit Low

P0276 means the engine computer has detected an abnormally low voltage on the electrical circuit that operates the fuel injector for cylinder number 6. The computer commands the injector to fire, but the return voltage it monitors stays below the expected threshold, indicating a short to ground, a faulty injector, or a wiring problem.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms at first
  • Rough idle or misfire that feels like a shake or stumble, especially when the engine is cold
  • Noticeable loss of power and reduced fuel economy because cylinder 6 is not contributing
  • Engine may run rich or emit black smoke if the injector is stuck open and flooding the cylinder
  • In some cases, the engine may enter limp mode or hesitate under acceleration

Common causes, most likely first

  1. Faulty fuel injector on cylinder 6 with an internally shorted coil
  2. Chafed or grounded wire in the injector harness between the computer and the injector
  3. Corroded or loose electrical connector at the cylinder 6 injector
  4. Short to ground inside the engine wiring harness from heat or vibration damage
  5. Failed driver circuit inside the engine control module (ECM) or powertrain control module (PCM)
  6. Aftermarket or damaged injector with incorrect resistance
  7. Moisture intrusion into the injector connector causing a low-resistance path to ground

How to diagnose and fix it

  1. Inspect the cylinder 6 injector connector for corrosion, tightness, and pushed-back pins, then clean and reseat it
  2. Measure the injector coil resistance with a multimeter and compare it to the manufacturer's specification
  3. Check the injector circuit for a short to ground by disconnecting the computer and testing the wire from the injector to ground
  4. Perform a wiggle test on the harness while watching live injector voltage data to reveal intermittent shorts
  5. Swap the cylinder 6 injector with a known-good injector from another cylinder to see if the code moves
  6. If the wiring and injector test good, test the injector driver output at the computer with a noid light or oscilloscope
  7. Replace the faulty injector, repair the damaged wire, or replace the computer only after all other tests confirm the fault

What a low injector circuit really means

  • A low circuit code does not automatically mean the injector is bad; a shorted wire or a failed computer driver can set the same code.
  • Many technicians replace the injector first and later find a rubbed-through wire behind the intake manifold or near a hot exhaust component.
  • An injector that is electrically shorted internally can still flow fuel, so the engine may run rich and foul the spark plug on cylinder 6.
  • Intermittent low-voltage codes often appear only when the engine is hot or after driving over rough roads, so a cold static test can miss the problem.
  • The computer may disable the injector to protect itself when it detects a short, causing a dead miss that feels like an ignition fault rather than a fuel fault.

Can I keep driving with P0276?

You can usually drive a short distance to a repair shop, but avoid heavy acceleration and long trips because raw fuel may wash down the cylinder walls or overheat the catalytic converter. If the engine is misfiring badly or flashing the check engine light, stop driving and have it towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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