P2062 indicates that the powertrain control module has detected an open circuit in the reductant regeneration supply control system. This circuit manages the flow of diesel exhaust fluid (DEF) during emissions regeneration. The code is triggered when the module cannot properly control the reductant supply.
The injector may be internally shorted or open, preventing the PCM from controlling DEF flow.
Corroded, damaged, or loose wiring between the injector, sensor, and PCM can break the control circuit.
An open sensor signal can cause the PCM to think the circuit is open, triggering the code.
If the pump does not deliver DEF, the control module may detect an abnormal supply condition.
A rare internal failure in the PCM can cause an open circuit, but this is considered only after other components are verified.
It means the vehicle's control module has detected an open circuit in the reductant regeneration supply control system, which can prevent proper DEF injection during emissions regeneration.
The vehicle may still run, but it can enter limp mode, reduce power, and may fail emissions tests until the issue is resolved.
No, the PCM is rarely the cause; most often the problem is a faulty injector, wiring issue, or sensor, which should be checked first.
Clearing the code without repairing the underlying fault will not resolve the issue, as the code will reappear when the fault persists.