OBD-II code · Chassis
C0547 Vacuum Sensor Supply Voltage Circuit/Open
Open circuit on the vacuum sensor supply voltage line. Vacuum sensors are used in vacuum-assisted brake boosters to monitor manifold or booster vacuum.
Is it safe to drive with C0547?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySupply wiring open
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Vacuum Sensor, Sensor Supply
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.