What Does P2527 Mean?
The PCM has detected an abnormally low voltage signal from the vacuum reservoir pressure sensor circuit. This indicates a short to ground, faulty sensor, or poor electrical connection.
Common Causes
35%
Short to ground in sensor signal circuit wiring
30%
Failed vacuum reservoir pressure sensor with internal short
20%
Damaged or corroded sensor connector causing ground fault
10%
Poor sensor ground connection
5%
Water intrusion in sensor or connector
Diagnostic Steps
1
Step 1: Disconnect the vacuum pressure sensor and measure voltage on the signal wire at the harness side (should read near 5V reference)
2
Step 2: Check for continuity between the signal wire and ground to identify shorts
3
Step 3: Inspect sensor connector for moisture, corrosion, or damaged pins causing shorts
4
Step 4: Measure sensor internal resistance and compare to specifications if available
5
Step 5: Verify sensor ground circuit continuity and resistance to PCM ground
Estimated Repair Cost
$120 - $400
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally low voltage signal from the vacuum reservoir pressure sensor circuit. This indicates a short to ground, faulty sensor, or poor electrical connection.
The most common cause of P2527 (Vacuum Reservoir Pressure Sensor Circuit Low) is: Short to ground in sensor signal circuit wiring
Typical repair costs for P2527 range from $120 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Brake boost monitoring is affected, potentially reducing brake assist function. Vehicle may require increased pedal effort for braking.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2527 to identify the root cause.
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Quick Info
Category
Powertrain
System
Vacuum System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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