The code indicates a high voltage condition in the electrical circuit that controls the reductant injection valve on bank 2, unit 1. This valve meters urea (DEF) into the exhaust to reduce NOx emissions.
The valve can short internally or develop a failed coil, causing excessive current draw that the PCM interprets as a high circuit condition.
Corroded, damaged, or loose pins can create a short to voltage, raising the measured circuit voltage above normal.
The electronic driver that switches the valve may develop a fault, though this occurs less frequently than valve or wiring issues.
A rare internal fault in the PCM's output circuit can generate a high reading, but it is seldom the primary cause of the code.
Replacing the PCM is rarely necessary; most often the issue is a faulty valve, wiring problem, or driver fault that can be repaired without computer replacement.
The code specifically references the injection valve circuit, not the pump; a pump failure typically triggers different codes related to low pressure or flow.
No, P2052 is tied to the reductant valve circuit; NOx sensor faults generate separate diagnostic trouble codes.
Driving with the code may reduce emissions performance and eventually trigger limp‑mode; it is advisable to address the issue promptly to avoid prolonged performance loss.