P2525 to P2529: vacuum reservoir pressure sensor
The sensor that reads the vacuum stored in a vacuum reservoir has a circuit fault or an implausible, low, high or intermittent signal.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P2525 mean?
Some engines store vacuum in a small reservoir to operate actuators such as turbo controls, intake flaps or exhaust valves, and on some cars the brake booster too. A sensor tells the computer how much vacuum is stored so it can keep enough in reserve. If the reading is wrong, the computer cannot be sure the actuators will work and may limit features. If the vacuum itself is low, actuators move slowly or not at all.
What causes P2525?
- A failed vacuum reservoir pressure sensor or its wiring
- A cracked vacuum hose or reservoir
- A failing vacuum pump, on engines that have one
- A leaking actuator diaphragm drawing the reservoir down
What to check first for P2525
- Inspect the vacuum hoses and the reservoir for cracks
- Compare the reservoir pressure with the engine off and running on a scan tool
- Check the brake pedal feel, in case the brake booster shares the vacuum
- Listen for a hiss from vacuum lines with the engine running
Can you drive with P2525?
Usually you can drive to a workshop. If the brake pedal feels harder than usual, do not drive; have the car towed.
In states with an OBD-II emissions inspection, a car with the check engine light on fails the test until the fault is fixed.
Codes on this page
- P2525Vacuum Reservoir Pressure Sensor Circuit
- P2526Vacuum Reservoir Pressure Sensor Circuit Range/Performance
- P2527Vacuum Reservoir Pressure Sensor Circuit Low
- P2528Vacuum Reservoir Pressure Sensor Circuit High
- P2529Vacuum Reservoir Pressure Sensor Circuit Intermittent
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
