P2625 indicates that the powertrain control module (PCM) has detected an abnormally high voltage signal from the injector control pressure (ICP) regulator circuit. This regulator manages high-pressure fuel or oil delivery to the injectors, and a 'high' reading typically points to a short to voltage in the wiring or an internal failure within the regulator itself. The code sets when the circuit voltage exceeds the manufacturer’s specified threshold for a calibrated period.
The signal or control wire has chafed, melted, or rubbed through its insulation and is touching a battery voltage source, causing the high reading. Inspect harnesses near hot components, sharp edges, or rotating parts.
The regulator’s internal electronics have developed a short circuit, causing it to feed back or pass through a higher voltage than intended. This requires testing the component’s resistance and isolation from the harness.
Moisture ingress or bent pins inside the electrical connector can create bridges between the regulator circuit and adjacent voltage feeds, artificially elevating the signal voltage.
If the 5-volt or 8-volt reference line feeding the regulator is shorted to a higher voltage source elsewhere in the harness, the PCM will interpret the return signal as high.
In rare cases, the PCM’s internal voltage regulator or driver circuit for the ICP regulator may malfunction, though this should only be considered after all wiring and component tests pass.
Not directly. P2625 is an electrical circuit code for the pressure regulator, not a mechanical pressure code. While a failed regulator can affect pressure, the code specifically indicates a high voltage condition in the control circuit, not a performance issue with the pump itself.
It is not recommended. Incorrect injector control pressure can cause improper injection timing, rough running, or stalling. In some cases, the PCM may command a limp-home mode that limits speed to prevent engine damage.
No. PCM failure is an uncommon cause of P2625. The vast majority of cases are resolved by repairing chafed wiring or replacing the ICP regulator. The PCM should only be considered after exhaustive testing proves the circuit and component are sound.
Not necessarily. This code refers to the electrical voltage in the regulator control circuit being high, not the physical fuel or oil pressure. However, a shorted regulator could potentially cause the system to command maximum pressure, so pressure should be verified with a gauge.