AutoCodes – Generic – P1C11

P1C11 Code - Vacuum Pump Relay Stuck Open

Quick Answer

The Engine Control Module (ECM) monitors the Vacuum Pump Relay. Common causes include Faulty Vacuum Pump Relay, Vacuum Pump Relay harness is open or shorted, Vacuum Pump Relay 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: P1C11 indicates Vacuum Pump Relay Stuck Open.
Common causes: Common causes include Faulty Vacuum Pump Relay, Vacuum Pump Relay harness is open or shorted, Vacuum Pump Relay 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 3,057

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 Mar 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1C11 Description

The Engine Control Module (ECM) monitors the Vacuum Pump Relay. The ECM sets the OBDII code when the Vacuum Pump Relay is not to factory specifications.

OBDII Code P1C11 - Vacuum Pump Relay Stuck Open - AutoCodes.com — P1C11 Code - Vacuum Pump Relay Stuck Open

What does this mean?

What are the Possible Causes of the DTC P1C11?

Faulty Vacuum Pump Relay
Vacuum Pump Relay harness is open or shorted
Vacuum Pump Relay circuit poor electrical connection

How to Fix the DTC P1C11?

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 P1C11 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 P1C11 code?

Need more information on how to fix the P1C11 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1C11 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1C11 Subaru — Vacuum Pump Relay Stuck Open

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 P1C11 Code

1. What are the common symptoms of OBDII code P1C11 (Vacuum Pump Relay Stuck Open)?

- Common symptoms include illuminated Check Engine Light, loss of power brakes, and potentially rough engine operation.

2. What can cause the Vacuum Pump Relay to get stuck open and trigger code P1C11?

- Potential causes include a faulty vacuum pump relay, wiring issues, vacuum pump failure, or a problem with the vacuum pump control module.

3. How serious is OBDII code P1C11 (Vacuum Pump Relay Stuck Open)?

- This code can affect the functionality of the power brake system, so it is important to address it promptly to ensure safe driving conditions.

4. Can I continue driving with OBDII code P1C11 active?

- It is not recommended to drive with this code active, as it can impact the performance of the power brake system and compromise safety.

5. How can I diagnose the Vacuum Pump Relay Stuck Open issue causing code P1C11?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the vacuum pump relay and related components, and testing the vacuum pump system.

6. What are some common repair tips for addressing OBDII code P1C11?

- Repair tips may include checking and replacing the vacuum pump relay, inspecting and repairing any damaged wiring, testing the vacuum pump for proper operation, and resetting the code.

7. Is it possible to reset OBDII code P1C11 without fixing the underlying issue?

- While you can clear the code temporarily, the underlying issue causing P1C11 will persist and trigger the code again until properly addressed.

8. How much does it typically cost to repair OBDII code P1C11?

- The cost of repair can vary depending on the specific issue causing the code, but it may involve replacing the vacuum pump relay, fixing wiring problems, or addressing vacuum pump malfunctions.

9. Can a DIY enthusiast fix OBDII code P1C11 at home?

- Depending on the root cause, some DIY enthusiasts may be able to address this code at home by following repair guides, using basic tools, and having some mechanical knowledge.

10. How long does it take to repair OBDII code P1C11 (Vacuum Pump Relay Stuck Open)?

- The repair time can vary based on the complexity of the issue and the skill level of the person performing the repair, but it typically takes a few hours to half a day to address this code.