Powertrain, generic (extended)

P258D Vacuum Pump Control Circuit A High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P258D marks a control circuit A of the vacuum pump whose signal sits above the expected range, most often a short to battery positive on the relay or pump control line, so the control unit can no longer switch the pump as it wants. If the pump keeps running, it wears out early; FCA case S1805000006 notes that pumps forced into excessive run time tend to fail. No manufacturer documents P258D publicly, so CARB 13 CCR 1968.2 comprehensive component rules apply. Ford's hybrid OBD summary shows the reference for the same circuit, a monitoring voltage between 1.3 and 5.0 V while the relay is off. Stellantis case S2209000006 adds that pump codes logged during long cranking can be harmless. P258C is the low-side partner, P258B the plausibility code. The driver may hear the pump run constantly.

Likely causes

Control wire shorted to a battery-voltage line
Pump relay contacts stuck closed
Faulty output stage in the controlling module

Symptoms

  • Engine or brake warning lamp on
  • Vacuum pump runs continuously, even with the engine off in some cases

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–700
Time0.3–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

vacuum pumpwiring harness

Related codes

P258AP258BP258CP25F1

References: law.cornell.edu, fordservicecontent.com, static.nhtsa.gov.