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Home / DTC / P2527 — Vacuum Reservoir Pressure Sensor Circuit Low

P2527 — Vacuum Reservoir Pressure Sensor Circuit Low

Detailed page for trouble code P2527.

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Code

P2527

Generic P — Powertrain

Vacuum Reservoir Pressure Sensor Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 33 RU: 13
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Page language: EN

Causes

  • Damaged or shorted sensor signal wire (short to ground)
  • Corroded, loose, or damaged connector or pins at sensor
  • Failed vacuum reservoir pressure sensor
  • Loss of sensor reference voltage or ground
  • Vacuum reservoir leak or blocked line affecting sensor reading
  • PCM/ECM internal fault or poor PCM ground

Symptoms

  • Malfunction Indicator Lamp (MIL) or Check Engine Light illuminated
  • Stored P2527 trouble code (may be accompanied by related vacuum/boost codes)
  • Possible reduced brake assist or hard pedal (if vacuum reservoir used for brake system)
  • Reduced engine performance or drivability issues in systems that rely on vacuum signal
  • Intermittent or inconsistent vacuum-related component behavior

What to check

  • Read freeze frame and live data with a scan tool; note sensor voltage and related freeze-frame parameters
  • Visual inspection of sensor, vacuum reservoir, vacuum lines and harness for damage, contamination or disconnection
  • Backprobe sensor connector and measure signal, reference (usually 5V) and ground
  • Wiggle-test wiring and connector while watching live data for intermittent changes
  • Measure resistance between signal wire and vehicle ground with connector disconnected to check for short to ground
  • Inspect and verify PCM/ECM power and ground circuits

Signal parameters

  • Typical sensor circuits use a 5 V reference, ground, and a signal wire
  • Expected signal voltage range (typical): approx. 0.5 V to 4.5 V depending on absolute pressure; exact range depends on vehicle
  • Low condition typically indicated by signal below ~0.4–0.5 V (thresholds vary by manufacturer)
  • Signal should change smoothly when vacuum/pressure applied to the reservoir (use handheld vacuum pump)

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame data and live PID for vacuum reservoir pressure sensor and related sensors.
  2. Perform a visual inspection of vacuum reservoir, vacuum lines and the sensor connector for damage, contamination or water intrusion. Repair obvious issues.
  3. With ignition ON (engine OFF), backprobe the sensor connector: verify 5 V reference (if used), sensor ground, and measure the signal voltage. Note values.
  4. If no 5 V reference or no ground, trace and repair power/ground circuits to PCM. Check fuses and main grounds.
  5. If reference and ground are present but signal is low, disconnect the sensor and measure resistance from the signal pin to chassis ground. A low resistance indicates a short to ground; repair wiring.
  6. Apply a known vacuum/pressure to the sensor with a handheld pump while monitoring signal voltage. If signal does not change or stays low, replace the sensor.
  7. Repair or replace damaged wiring/connectors as needed. After repairs, clear codes and perform a road test or system exercise to confirm the fault is gone.
  8. If wiring and sensor check good and the fault returns, perform pin-to-pin continuity to the PCM and inspect PCM grounds. Consider PCM fault only after all harness and sensor checks pass.

Likely causes

  • Shorted signal wire to ground or chafed wiring harness
  • Corroded/contaminated connector causing poor contact
  • Failed or water-damaged pressure sensor
  • Missing 5V reference or bad ground at sensor
  • Intermittent harness damage near swivel points or engine movement

Fault status

⚠️ Status
Vacuum Reservoir Pressure Sensor Circuit Low — signal below expected threshold. Possible short to ground, open/poor connection, sensor failure, or lost reference/ground.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P2528 P0107 P0108 P0191
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