Code result
P2528
Vacuum Reservoir Pressure Sensor Circuit High
Moderate severity
What it means
Sensor signal voltage above the upper limit — usually a short to reference voltage or open signal return. ECM disables vacuum pump control to avoid overshooting.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Signal wire shorted to reference voltage
highOne of the most commonly reported causes for this code — check this first.
Open signal return
mediumA plausible cause — test and verify before replacing parts.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Related help
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