What does code P258D mean?

Q: What does code P258D mean?

Vacuum Pump Control Circuit A High. P258D indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the vacuum pump, which is typically used to supply vacuum for brake assist or other vacuum-operated systems on engines that do not produce sufficient manifold vacuum. The PCM monitors the circuit and sets this code when the voltage on the control circuit exceeds the expected range, often indicating a short to power, an open circuit, or a faulty pump control module.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P258D

P258DVacuum Pump Control Circuit A High

P258D indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the vacuum pump, which is typically used to supply vacuum for brake assist or other vacuum-operated systems on engines that do not produce sufficient manifold vacuum. The PCM monitors the circuit and sets this code when the voltage on the control circuit exceeds the expected range, often indicating a short to power, an open circuit, or a faulty pump control module.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.