Powertrain
generic / SAE
P257C
Vacuum Reservoir Control Circuit High
The vacuum reservoir control circuit reads stuck high — short to battery voltage or open coil. The driver cannot pull the line low to actuate the valve/motor.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 7C
Possible causes
- Control wire shorted to battery voltage high
- Open coil medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–600 €
- Estimated time: 0.5–2 h
- Component: vacuum reservoir control valve
- MIL / check engine light
Sources
References
sae:J2012