P2528Vacuum Reservoir Pressure Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2528 is logged when the vacuum reservoir pressure sensor delivers a voltage near or at its supply, beyond anything the sensing element can output. A signal wire touching 5 V or battery voltage, a broken sensor ground, or corrosion bridging pins in the connector are the classic findings. A real loss of vacuum does not normally push the signal this far; it would appear as a range or performance fault instead. No vehicle maker documents P2528 publicly, so this rests on CARB's demand that comprehensive component inputs be checked for circuit faults, and on how such reservoirs work: a pump, often on the camshaft of diesels and hybrids, keeps them evacuated for the brake booster and actuators. P2527 is the low extreme, P2529 an intermittent signal. Expect default actuator control.
- What you may notice
- Check engine light depending on maker
- Reduced power with actuators in default position
- Likely causes
- LikelySignal wire shorted to 5 V or battery voltage
- PossibleSensor ground open
- RareCorrosion bridging pins in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.