OBD Guide
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P1577

Brake Booster Vacuum Sensor Circuit Low Input

P1577 is an OBD-II diagnostic trouble code meaning: Brake Booster Vacuum Sensor Circuit Low Input. Common causes: vacuum booster sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Hard brake pedal
  • Check engine light comes on
  • Reduced braking performance
  • Unusual sounds when braking

Causes

  • Vacuum booster sensor malfunction
  • Open or short circuit in the sensor circuit
  • Wiring Harness Problems
  • Faulty vacuum brake booster

How to Fix

  1. Check the integrity of the sensor circuit
  2. Check connections and connectors
  3. Replace vacuum booster sensor if necessary
  4. Check the operation of the vacuum booster

Related codes

P1576P1578

Error P1577 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1577 code mean?

P1577 is an OBD-II diagnostic trouble code that indicates: Brake Booster Vacuum Sensor Circuit Low Input

What causes a P1577 error code?

The most common causes of P1577 include: Vacuum booster sensor malfunction; Open or short circuit in the sensor circuit; Wiring Harness Problems; Faulty vacuum brake booster.

How do I fix a P1577 diagnostic trouble code?

To fix P1577: Check the integrity of the sensor circuit. Check connections and connectors. Replace vacuum booster sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1577?

Yes, but get it checked soon

How much does it cost to fix P1577?

The estimated repair cost for P1577 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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