AutoCodes – Subaru – P1C12 Subaru

P1C12 Subaru Code - Vacuum Pump Relay Stuck Closed

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: P1C12 Subaru indicates Vacuum Pump Relay Stuck Closed.
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 1,021

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 P1C12 Subaru 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 P1C12 Subaru - Vacuum Pump Relay Stuck Closed - AutoCodes.com — P1C12 Subaru Code - Vacuum Pump Relay Stuck Closed

What does this mean?

What are the Possible Causes of the DTC P1C12 Subaru?

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

How to Fix the DTC P1C12 Subaru?

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 P1C12 Subaru 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 P1C12 Subaru code?

Need more information on how to fix the P1C12 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1C12 Subaru 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 P1C12 Subaru Code

1. What are the common symptoms of OBDII code P1C12 in a Subaru related to the Vacuum Pump Relay Stuck Closed?

- Common symptoms may include hard starting, rough idle, loss of power, and the check engine light coming on.

2. What can cause the Vacuum Pump Relay to be stuck closed in a Subaru, triggering code P1C12?

- The Vacuum Pump Relay may get stuck closed due to a faulty relay, wiring issues, or a problem with the vacuum pump itself.

3. How can I diagnose the Vacuum Pump Relay issue in my Subaru when experiencing OBDII code P1C12?

- To diagnose the issue, you can perform a visual inspection of the relay and wiring, test the relay with a multimeter, and check the vacuum pump operation.

4. Is it safe to continue driving my Subaru with OBDII code P1C12 related to a Vacuum Pump Relay Stuck Closed?

- It is not recommended to drive the vehicle with this issue as it can lead to further damage and affect the performance of the vehicle.

5. Can I reset the OBDII code P1C12 in my Subaru related to the Vacuum Pump Relay Stuck Closed, or does it require immediate repair?

- You can clear the code temporarily, but it is important to address the underlying issue causing the code to prevent further problems.

6. How much does it typically cost to repair the Vacuum Pump Relay issue causing OBDII code P1C12 in a Subaru?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any DIY tips for fixing the Vacuum Pump Relay Stuck Closed issue triggering OBDII code P1C12 in a Subaru?

- DIY tips may include checking and cleaning the relay contacts, inspecting and repairing any damaged wiring, and ensuring proper vacuum pump operation.

8. Will fixing the Vacuum Pump Relay issue causing OBDII code P1C12 improve the overall performance and fuel efficiency of my Subaru?

- Yes, addressing the Vacuum Pump Relay issue can help restore proper engine performance, improve fuel efficiency, and prevent potential damage to other components.

9. How long does it typically take to repair the Vacuum Pump Relay issue related to OBDII code P1C12 in a Subaru?

- The repair time can vary depending on the exact cause of the issue and the availability of parts, but it may take a few hours to complete the repair.

10. Can a Subaru dealership or an independent mechanic effectively diagnose and repair the Vacuum Pump Relay issue causing OBDII code P1C12?

- Yes, both a Subaru dealership and an independent mechanic with experience in Subaru vehicles should be able to diagnose and repair the issue effectively.