P0264 indicates that the powertrain control module has detected a low voltage condition in the circuit of the fuel injector for cylinder 2. This usually means the injector is not receiving enough power to open properly.
The injector may have an internal short or open circuit that prevents it from drawing the proper voltage.
Chafed, broken, or corroded wires in the injector circuit can cause a drop in voltage.
Loose, dirty, or oxidized injector connector pins can increase resistance and produce a low‑voltage reading.
A malfunctioning driver transistor inside the powertrain control module can limit voltage to the injector, but this is less common than external faults.
No. P0264 specifically monitors the injector circuit voltage, not ignition components. A faulty spark plug may cause a misfire but will not trigger this code.
In the majority of cases the PCM is not at fault. External wiring, connectors, or the injector itself are far more common causes. PCM replacement should be a last resort after all other diagnostics are exhausted.
Cleaning may help if the injector is sticking mechanically, but P0264 is a low‑voltage circuit issue. Unless the cleaning also resolves a short or open circuit, it is unlikely to clear the code.
A severely weak or failing battery can cause low system voltage, but the PCM monitors injector voltage relative to battery voltage and usually compensates. Only a battery that cannot maintain proper voltage under load would potentially affect the reading, and it would likely trigger additional codes.