P2525: Vacuum Reservoir Pressure Sensor Circuit

What it means

The vacuum reservoir pressure sensor circuit has a detected electrical fault. The code does not establish which vacuum system or control strategy is involved.

At a glance

• Usually lights the check-engine light

How it works

The vacuum reservoir pressure sensor reports pressure in a vacuum reservoir used by a vehicle system. The control module monitors the sensor circuit for an electrical fault and sets P2525 when it detects one; the code does not identify which vacuum system or control strategy is involved.

Common causes

Most likely first.

1. Open or shorted wiring to the sensor
2. Failed sensor element

Symptoms

• Vacuum-assisted functions may be reduced or inconsistent
• A related warning light may appear

How to diagnose it

1. Record freeze-frame data and check for related vacuum, sensor, or module codes to see what operating conditions accompanied the fault.
2. Inspect the reservoir pressure sensor connector and wiring for damage, loose pins, corrosion, or disconnected terminals.
3. Use the wiring diagram to check the sensor circuit for opens or shorts, following the manufacturer's method for isolating the circuit.
4. Check the sensor supply, ground, and signal circuits against the manufacturer's specification.
5. If the wiring and supply circuits pass, compare scan-tool reservoir pressure data with the system's operating condition and test the sensor as specified by the manufacturer.

Common fixes

• Reconnect a loose vacuum reservoir pressure sensor connector.
• Clean or repair corroded terminals or damaged sensor wiring.
• Repair an open or short in the sensor circuit.
• Replace the reservoir pressure sensor if circuit tests pass and the sensor fails testing.

Can I keep driving?

Drive cautiously until you know which system uses the reservoir, since a vacuum-assisted function may be reduced or inconsistent. If braking assistance or another safety-related function feels different, stop driving and have the vehicle checked.