P2148 signals that the voltage supplied to the fuel injector group control circuit is higher than the expected range. The PCM detects an over‑voltage condition in the circuit that powers the injectors.
The driver module that switches power to the injector group can develop an internal fault, causing it to output excessive voltage.
A wire in the injector supply circuit may be shorted to a 12‑volt source or to a voltage‑boost circuit, raising the measured voltage.
Poor contact at the injector harness can cause the circuit to reference a different voltage reference, leading to a high reading.
An inadequate ground or fluctuating reference voltage can make the control circuit appear over‑voltage.
A failure inside the PCM's injector driver output stage can produce excess voltage, but this is rare.
Usually not. The PCM's output circuit rarely fails; most often the issue is a wiring fault, connector problem, or a defective injector driver module.
A shorted injector can pull excessive current but does not typically raise the supply voltage; the code is related to the control circuit voltage, not the injector itself.
Yes. An over‑voltage condition can damage the injector driver module or other components, so the issue should be diagnosed and repaired promptly.
No. Only the affected injector group circuit components need attention; replacing injectors unnecessarily is not required.