What Does P2529 Mean?
The vacuum reservoir pressure sensor signal is erratic or intermittently cutting in and out. This indicates a loose connection, damaged wire, or sensor that is beginning to fail.
Common Causes
40%
Intermittent connection at sensor connector due to corrosion or looseness
30%
Damaged wiring harness with intermittent short or open
20%
Failing vacuum pressure sensor with internal intermittent fault
7%
Vibration-induced connector or terminal movement
3%
Moisture intrusion causing intermittent shorts
Diagnostic Steps
1
Step 1: Wiggle test the sensor connector and wiring harness while monitoring live data to reproduce the intermittent fault
2
Step 2: Inspect the sensor connector for corrosion, loose pins, or inadequate terminal tension
3
Step 3: Check wiring harness routing for areas of chafing, pinching, or contact with hot/moving components
4
Step 4: Apply dielectric grease to cleaned connector terminals and ensure proper connection
5
Step 5: Monitor sensor voltage on an oscilloscope during a test drive to capture intermittent dropouts or spikes
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
The vacuum reservoir pressure sensor signal is erratic or intermittently cutting in and out. This indicates a loose connection, damaged wire, or sensor that is beginning to fail.
The most common cause of P2529 (Vacuum Reservoir Pressure Sensor Circuit Intermittent) is: Intermittent connection at sensor connector due to corrosion or looseness
Typical repair costs for P2529 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent loss of brake boost monitoring may result in unexpected changes in brake pedal feel. Driver should be aware of potential brake assist variations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2529 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Vacuum System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
