AutoCodes – Subaru – P1C22 Subaru

P1C22 Subaru Code - 12V Auxiliary Battery Voltage Too Low

Quick Answer

The Engine Control Module (ECM) monitors the 12V Auxiliary Battery. Common causes include Faulty 12V Auxiliary Battery, 12V Auxiliary Battery harness is open or shorted, 12V Auxiliary Battery 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: P1C22 Subaru indicates 12V Auxiliary Battery Voltage Too Low.
Common causes: Common causes include Faulty 12V Auxiliary Battery, 12V Auxiliary Battery harness is open or shorted, 12V Auxiliary Battery 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,930

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 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1C22 Subaru Description

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

OBDII Code P1C22 Subaru - 12V Auxiliary Battery Voltage Too Low - AutoCodes.com — P1C22 Subaru Code - 12V Auxiliary Battery Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P1C22 Subaru?

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

How to Fix the DTC P1C22 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 P1C22 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 P1C22 Subaru code?

Need more information on how to fix the P1C22 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1C22 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 P1C22 Subaru Code

1. What are the common symptoms of OBDII code P1C22 in a Subaru related to the 12V auxiliary battery voltage being too low?

- Common symptoms include difficulty starting the vehicle, dimming lights, erratic electrical issues, and a warning light on the dashboard.

2. What are the possible causes of the OBDII code P1C22 indicating that the 12V auxiliary battery voltage is too low in a Subaru?

- Possible causes include a failing auxiliary battery, faulty battery charging system, loose or corroded battery connections, or issues with the vehicle's electrical system.

3. How can I diagnose the cause of OBDII code P1C22 in my Subaru indicating low voltage of the 12V auxiliary battery?

- Start by checking the voltage of the auxiliary battery using a multimeter. Inspect the battery connections for tightness and corrosion. Test the alternator and charging system for proper functionality.

4. Is it safe to continue driving my Subaru with OBDII code P1C22 indicating low voltage of the 12V auxiliary battery?

- It is not recommended to drive the vehicle for an extended period with a low voltage issue, as it can lead to further electrical problems and potential stalling or non-starting of the vehicle.

5. Can I reset the OBDII code P1C22 related to the low voltage of the 12V auxiliary battery in my Subaru?

- While you can clear the code using an OBDII scanner, it is crucial to address the underlying issue causing the low voltage to prevent the code from reoccurring.

6. How can I repair OBDII code P1C22 in my Subaru if it indicates the voltage of the 12V auxiliary battery is too low?

- Repair options may include replacing the auxiliary battery, repairing or replacing the alternator, cleaning or tightening battery connections, and checking for any electrical system faults.

7. What are some preventive maintenance tips to avoid OBDII code P1C22 related to low voltage of the 12V auxiliary battery in a Subaru?

- Regularly inspect and maintain the auxiliary battery, keep battery connections clean and tight, ensure the alternator is functioning correctly, and address any electrical issues promptly.

8. Can extreme weather conditions affect the voltage of the 12V auxiliary battery in a Subaru and trigger OBDII code P1C22?

- Yes, extreme cold or hot weather can impact battery performance and voltage, potentially leading to a low voltage condition triggering the OBDII code.

9. Will replacing the 12V auxiliary battery resolve OBDII code P1C22 in my Subaru?

- Replacing the auxiliary battery may resolve the code if the battery is the sole cause of the low voltage issue. However, it is essential to diagnose other potential causes as well.

10. How long does it typically take to repair OBDII code P1C22 indicating low voltage of the 12V auxiliary battery in a Subaru?

- The repair time can vary depending on the underlying cause. Simple fixes like tightening connections may take minutes, while more complex issues could require a few hours or more.