What it means
Vacuum Sensor B Range/Performance: the signal is implausible or outside the valid range.
How it works
Vacuum sensor B reports vacuum information used by the control module to assess brake-assist availability. C054E sets when sensor B's signal is present but is implausible or outside the range the module expects.
Common causes
Most likely first.
- Vacuum sensor fault
- Wiring or connector fault
- Vacuum supply or hose problem
Symptoms
- Brake or stability-control warning light on
- Brake assist may be affected
How to diagnose it
- Record freeze-frame data and review live data for vacuum sensor B to see whether its reading is out of range or fails to respond as conditions change.
- Inspect sensor B's connector and wiring for loose pins, corrosion, chafing, or damage that could distort its signal.
- Check the vacuum hose and supply serving sensor B for disconnection, cracking, blockage, or leakage.
- Compare sensor B's reading with the vehicle's other available vacuum data and operating conditions to identify an implausible sensor response.
- Test sensor B and its circuit according to vehicle wiring information and the manufacturer's specification before replacing parts.
Common fixes
- Reconnect or replace a damaged, leaking, or obstructed vacuum hose serving sensor B.
- Repair damaged wiring or clean and secure sensor B's connector terminals.
- Replace vacuum sensor B if its output remains implausible after its supply and circuit pass inspection.
- Correct a vacuum supply fault if testing identifies one.
Can I keep driving?
Use caution and allow extra stopping distance because brake assist may be affected. Avoid driving if the brake pedal feels unusually hard or braking performance changes.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.