P0262 indicates that the engine control unit has detected a voltage level in the injector circuit for cylinder 1 that is higher than the expected range. This usually means the injector is delivering too much current, or the wiring or control signal is abnormal.
A failing injector can remain closed, drawing excess current, or develop a short that keeps it energized.
Damaged or corroded wiring or a poor connector contact can cause the control signal to be misinterpreted as a high‑voltage condition.
An intermittent fault in the PCM’s injector control logic can send too much current to the injector, but this is less common than a hardware issue.
Excessive fuel pressure can sometimes cause the injector to draw more current, but this is a rare cause for a high‑circuit code.
A bad ground or interference from another electrical source can alter the voltage reading, but usually this shows up with additional codes.
Yes, but it is uncommon. The PCM may send an incorrect pulse, but the majority of P0262 cases are due to a failing injector or wiring.
Not necessarily. It may cause rough running or a misfire, but the engine typically continues to run. If the misfire is severe, the vehicle may stall.
A stuck or high‑current injector can lead to incomplete combustion, increasing emissions, and may eventually trigger additional catalytic converter or oxygen sensor codes.