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Engine-Codes – Generic – C1085

C1085 Code - Vacuum Pressure Sensor High

Quick Answer

The C1085 diagnostic trouble code indicates that there is a high reading coming from the vacuum pressure sensor in the vehicle. Common causes include Faulty vacuum pressure sensor, Vacuum leak in the intake system, Clogged or restricted intake manifold. 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
C1085 indicates Vacuum Pressure Sensor High.
Common causes
Common causes include Faulty vacuum pressure sensor, Vacuum leak in the intake system, Clogged or restricted intake manifold.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code C1085 Description

The C1085 diagnostic trouble code indicates that there is a high reading coming from the vacuum pressure sensor in the vehicle. The vacuum pressure sensor plays a crucial role in the engine management system by measuring the intake manifold vacuum pressure. This information is used by the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion.

OBDII Code C1085 - Vacuum Pressure Sensor High
C1085 Code - Vacuum Pressure Sensor High

Common Causes of C1085

  1. Faulty vacuum pressure sensor
  2. Vacuum leak in the intake system
  3. Clogged or restricted intake manifold
  4. Issues with the ECM
  5. Wiring or connector issues in the sensor circuit

Symptoms of C1085

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or engine misfires
  4. Hesitation or lack of power during acceleration
  5. Engine stalling

How to Fix C1085

  1. Begin by using a diagnostic scan tool to confirm the C1085 code and identify the specific cause of the high vacuum pressure reading.
  2. Inspect the vacuum pressure sensor and its wiring harness for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check for any vacuum leaks in the intake system and repair or replace any damaged hoses or gaskets.
  4. Clean or replace the intake manifold if it is clogged or restricted.
  5. Clear the trouble code from the ECM's memory using the diagnostic scan tool and perform a test drive to ensure the issue has been resolved.

Cost to Fix C1085

The cost of repairing a high vacuum pressure sensor can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the replacement of a vacuum pressure sensor can range from $100 to $300, including parts and labor. Additional costs may apply if there are other underlying issues that need to be addressed. It's recommended to consult with a qualified mechanic to get an accurate estimate based on your vehicle's make and model. Labor rates at auto repair shops can vary between $80 and $150 per hour, so it's advisable to inquire about local rates for a more precise cost estimate.

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Code C1085 Information for Specific Makes

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 C1085 Code

1. What are the common symptoms of OBDII code C1085 (Vacuum Pressure Sensor High)?

The common symptoms of code C1085 include rough idling, decreased engine performance, and potential stalling.

2. What are the possible causes of OBDII code C1085?

Possible causes of code C1085 may include a faulty vacuum pressure sensor, a vacuum leak in the intake system, or a problem with the vacuum pressure sensor circuit.

3. How can I diagnose the issue related to OBDII code C1085?

Diagnosing code C1085 typically involves checking the vacuum pressure sensor for proper operation, inspecting the intake system for leaks, and testing the sensor circuit for any faults.

4. Can a vacuum pressure sensor high error cause other problems in the vehicle?

Yes, a vacuum pressure sensor high error can lead to issues such as poor fuel efficiency, increased emissions, and potential damage to other engine components if left unresolved.

5. Is it safe to continue driving with OBDII code C1085 present?

It is not recommended to continue driving with code C1085 present, as it can cause further damage to the engine and affect the overall performance of the vehicle.

6. How can I repair OBDII code C1085 (Vacuum Pressure Sensor High) myself?

Repairing code C1085 may involve replacing the faulty vacuum pressure sensor, repairing any vacuum leaks in the intake system, or fixing any issues in the sensor circuit. It is important to have the necessary tools and knowledge to perform these repairs.

7. Are there any preventive measures to avoid OBDII code C1085 in the future?

Regular maintenance of the intake system, including checking for vacuum leaks and ensuring the vacuum pressure sensor is functioning properly, can help prevent the occurrence of code C1085.

8. Can a simple reset of the OBDII system clear code C1085?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing code C1085 is not addressed, the code is likely to reappear.

9. How much does it typically cost to repair OBDII code C1085 at a professional auto repair shop?

The cost of repairing code C1085 at a professional auto repair shop can vary depending on the specific issue causing the code, the labor rates, and the cost of parts. It is recommended to obtain quotes from different shops for an accurate estimate.

10. Can code C1085 be triggered by other related OBDII codes?

Code C1085 can sometimes be triggered by other related codes, such as vacuum sensor circuit low or intake system leak codes, as they are all interconnected in the vehicle's engine management system.

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