Powertrain
generic / SAE
P257A
Vacuum Reservoir Control Circuit/Open
The control circuit that drives the vacuum reservoir control valve (or vacuum pump motor) is open. The ECM cannot energise the actuator, so vacuum is no longer maintained on demand and consumers like brake booster, EGR or HVAC dampers may run out of vacuum.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 7A
Possible causes
- Open control wire high
- Failed driver in the control module medium
- Pin pushed back out of connector body low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–600 €
- Estimated time: 0.5–2 h
- Component: vacuum reservoir control valve
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012