P0276 indicates that the powertrain control module (PCM) has detected a voltage level in the cylinder 6 fuel injector circuit that is below the expected range. This low‑voltage condition usually points to an open circuit, a short to ground, or a failure of the injector itself.
The injector’s internal coil may be open or shorted, causing the PCM to see a low voltage signal.
A broken wire, chafed insulation, or a disconnected harness between the PCM and the injector can create a low‑voltage condition.
Poor contact at the injector plug adds resistance, dropping the voltage seen by the PCM.
A defective driver transistor inside the PCM can fail to supply proper voltage, though this is uncommon.
If the vehicle uses a dedicated injector driver module, a fault there can produce the same low‑voltage code.
A high‑resistance or open ground path prevents the injector circuit from completing, resulting in low voltage.
PCM replacement is rarely required; the majority of P0276 cases are caused by the injector itself, wiring, or connector issues.
No, fuel pump problems typically set different codes (e.g., P0087). P0276 is specific to the injector circuit.
Driving with a misfiring cylinder can damage the catalytic converter and reduce drivability; repair should be performed promptly.
Measure the injector resistance at its electrical connector with a multimeter, or command the injector on/off via a scan tool while monitoring voltage at the connector.