Powertrain
generic / SAE
P258A
Vacuum Pump Control Circuit A/Open
The control circuit driving the electric vacuum pump (used to maintain brake-booster vacuum on direct-injection or hybrid powertrains where the engine is not always running) is open. The ECM cannot run the pump on demand — booster vacuum drops, pedal feel hardens, brake assist may be reduced.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 8A
Possible causes
- Open control wire to the pump high
- Failed driver in the control module medium
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–700 €
- Estimated time: 0.5–2.5 h
- Component: vacuum pump
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012