AutoCodes – Generic – C1777

C1777 Code - Vacuum Pressure Circuit Failure

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Vacuum Pressure Sensor. Common causes include Faulty Vacuum Pressure Sensor, Vacuum Pressure Sensor harness is open or shorted, Vacuum Pressure Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1777 indicates Vacuum Pressure Circuit Failure.
Common causes: Common causes include Faulty Vacuum Pressure Sensor, Vacuum Pressure Sensor harness is open or shorted, Vacuum Pressure Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 8,459

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1777 Description

The Anti-Lock Brake System (ABS) Module monitors the Vacuum Pressure Sensor. The ABS Module sets the OBDII code when the Vacuum Pressure Sensor is not to factory specifications.

OBDII Code C1777 - Vacuum Pressure Circuit Failure - AutoCodes.com — C1777 Code - Vacuum Pressure Circuit Failure

What does this mean?

What are the Possible Causes of the DTC C1777?

Faulty Vacuum Pressure Sensor
Vacuum Pressure Sensor harness is open or shorted
Vacuum Pressure Sensor circuit poor electrical connection

How to Fix the DTC C1777?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1777 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C1777 code?

Need more information on how to fix the C1777 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1777 code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1777 Code

1. What are the common symptoms of OBDII code C1777 (Vacuum Pressure Circuit Failure)?

- Common symptoms include rough idling, poor acceleration, decreased fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code C1777?

- The code C1777 can be caused by issues such as vacuum leaks, damaged vacuum hoses, faulty vacuum pressure sensors, or a malfunctioning vacuum pump.

3. How can I diagnose the Vacuum Pressure Circuit Failure related to code C1777?

- Diagnosis typically involves inspecting the vacuum hoses for leaks, testing the vacuum pressure sensors, and checking the vacuum pump's functionality using a vacuum gauge.

4. Can I drive my vehicle with OBDII code C1777?

- It is not recommended to drive the vehicle with code C1777 as it can lead to poor engine performance and potential damage if left unresolved.

5. How can I repair OBDII code C1777 (Vacuum Pressure Circuit Failure)?

- Repairing the code typically involves locating and repairing any vacuum leaks, replacing damaged vacuum hoses, testing and replacing faulty sensors, or repairing/replacing the vacuum pump.

6. Will resetting the OBDII code C1777 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the root cause of the Vacuum Pressure Circuit Failure is not addressed, the code is likely to reappear.

7. Can a DIY enthusiast fix OBDII code C1777 at home?

- Some aspects of addressing code C1777, such as checking for vacuum leaks or replacing vacuum hoses, can be done by DIY enthusiasts with the necessary tools and knowledge.

8. How much does it cost to repair OBDII code C1777 at a professional mechanic?

- The cost of repairing code C1777 can vary depending on the specific issue, but it may range from $100 to $500 or more, including parts and labor.

9. Is OBDII code C1777 a serious issue that requires immediate attention?

- While the severity of the issue may vary, it is recommended to address code C1777 promptly to avoid potential engine damage and ensure optimal vehicle performance.

10. Can a faulty vacuum pressure circuit affect other systems in the vehicle?

- Yes, a malfunctioning vacuum pressure circuit can impact other systems such as the braking system, emission control, and overall engine performance.