AutoCodes – Subaru – P1C09 Subaru

P1C09 Subaru Code - 12V Battery Relay Performance Or Stuck On

Quick Answer

The Engine Control Module (ECM) monitors the 12V Battery Relay. Common causes include Faulty 12V Battery Relay, 12V Battery Relay harness is open or shorted, 12V Battery 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: P1C09 Subaru indicates 12V Battery Relay Performance Or Stuck On.
Common causes: Common causes include Faulty 12V Battery Relay, 12V Battery Relay harness is open or shorted, 12V Battery 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 2,153

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 P1C09 Subaru Description

The Engine Control Module (ECM) monitors the 12V Battery Relay. The ECM sets the OBDII code when the 12V Battery Relay is not to factory specifications.

OBDII Code P1C09 Subaru - 12V Battery Relay Performance Or Stuck On - AutoCodes.com — P1C09 Subaru Code - 12V Battery Relay Performance Or Stuck On

What does this mean?

What are the Possible Causes of the DTC P1C09 Subaru?

Faulty 12V Battery Relay
12V Battery Relay harness is open or shorted
12V Battery Relay circuit poor electrical connection

How to Fix the DTC P1C09 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 P1C09 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 P1C09 Subaru code?

Need more information on how to fix the P1C09 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P1C09 Subaru Code

1. What does the OBDII code P1C09 for Subaru indicate?

The code P1C09 in a Subaru refers to the 12V Battery Relay Performance Or Stuck On issue.

2. What are the common symptoms of the P1C09 OBDII code in a Subaru?

Common symptoms of the P1C09 code include difficulty starting the vehicle, dimming lights, and issues with electrical components.

3. What can cause the P1C09 code to appear in a Subaru?

The P1C09 code in a Subaru is usually triggered by a malfunctioning 12V battery relay, a faulty electrical connection, or a problem with the battery itself.

4. How serious is the P1C09 OBDII code in a Subaru?

While the P1C09 code may not cause immediate harm to the vehicle, it can lead to starting issues and affect the overall electrical system's performance over time.

5. Can I continue driving my Subaru with the P1C09 code present?

It is not recommended to drive your Subaru with the P1C09 code present, as it can lead to potential starting and electrical issues that may leave you stranded.

6. How can I diagnose the P1C09 code in my Subaru?

Diagnosing the P1C09 code typically involves using an OBDII scanner to read the code, checking the 12V battery relay, inspecting electrical connections, and testing the battery's voltage.

7. What are some repair tips for fixing the P1C09 code in a Subaru?

Repairing the P1C09 code may involve replacing the 12V battery relay, repairing any damaged electrical connections, and ensuring the battery is functioning properly.

8. Can I reset the P1C09 code in my Subaru without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is crucial to address the root cause of the problem to prevent it from reoccurring.

9. How much does it cost to repair the P1C09 code in a Subaru?

The cost of repairing the P1C09 code can vary depending on the extent of the issue and the parts needed, but it may range from $100 to $300 at a dealership or repair shop.

10. Is the P1C09 OBDII code common in Subaru vehicles?

The P1C09 code is not as common as some other OBDII codes in Subaru vehicles, but it can still occur due to issues with the 12V battery relay or related components.