C1777
Vacuum Pressure Circuit Failure
C1777 is an OBD-II diagnostic trouble code meaning: Vacuum Pressure Circuit Failure. Common causes: vacuum hose rupture, vacuum pump malfunction. Estimated repair cost: $56–167.
Symptoms
- Hard brake pedal
- Unstable engine operation at idle
- Check Engine Light Illuminates
- Reduced braking performance
Causes
- Vacuum hose rupture
- Vacuum pump malfunction
- Pressure sensor circuit open
- Oxidation of connector contacts
- Solenoid valve failure
How to Fix
- Visual inspection of vacuum lines for cracks
- Checking the integrity of the wiring harness
- Diagnostics of sensor resistance with a multimeter
- Testing the operation of the vacuum pump
- Replacing damaged components
Related codes
FAQ
What does the C1777 code mean?
C1777 is an OBD-II diagnostic trouble code that indicates: Vacuum Pressure Circuit Failure
What causes a C1777 error code?
The most common causes of C1777 include: Vacuum hose rupture; Vacuum pump malfunction; Pressure sensor circuit open; Oxidation of connector contacts.
How do I fix a C1777 diagnostic trouble code?
To fix C1777: Visual inspection of vacuum lines for cracks. Checking the integrity of the wiring harness. Diagnostics of sensor resistance with a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1777?
Limited driving only, diagnose soon
How much does it cost to fix C1777?
The estimated repair cost for C1777 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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