P2150 indicates the Powertrain Control Module has detected a low voltage condition in the fuel injector group B supply circuit. This means the injector voltage is below the minimum threshold required for proper operation.
Corroded, broken, or shorted wires or a loose/dirty connector can drop the voltage supplied to the injector group.
One or more injectors may have an internal short to ground, drawing excessive current and pulling the supply voltage low.
The driver transistor or MOSFET that switches the injector voltage may be failing, limiting the voltage delivered to the group.
If the overall system voltage is low, the injector supply voltage may fall below the threshold, triggering the code.
A completely failed PCM is an unlikely cause; it is listed last because most cases are resolved by addressing wiring or injectors.
In the overwhelming majority of cases, the PCM is not the culprit. Wiring, connectors, or the injectors themselves are far more common causes. Replace the PCM only after all other possibilities have been ruled out.
Yes. Low overall system voltage can cause the injector supply voltage to drop below the minimum threshold, especially under load, triggering the code.
The code will clear temporarily, but if the underlying low‑voltage condition remains, the code will return and the symptoms will persist.
Driving is possible, but the engine may run poorly, have reduced power, and may experience increased emissions. It is advisable to diagnose and repair the issue promptly.