AutoCodes – Generic – P1C22

P1C22 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 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.

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Code Popularity 2,603

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

What does this mean?

What are the Possible Causes of the DTC P1C22?

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?

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 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 code?

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

Need Help with the Code?

Get the P1C22 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1C22 Subaru — 12V Auxiliary Battery Voltage Too Low

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 Code

1. What are the common symptoms of OBDII code P1C22 (12V Auxiliary Battery Voltage Too Low)?

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

2. What are the possible causes of OBDII code P1C22?

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

3. How can I diagnose the 12V auxiliary battery voltage issue?

- You can start by checking the voltage of the auxiliary battery using a multimeter and inspecting the battery connections for any signs of damage or corrosion.

4. Can a weak 12V auxiliary battery cause other problems in the vehicle?

- Yes, a weak auxiliary battery can lead to various electrical issues, affect the performance of hybrid systems, and cause malfunctions in the vehicle's electronics.

5. What should I do if I get the OBDII code P1C22?

- It is recommended to have the auxiliary battery and charging system inspected by a professional to determine the exact cause of the voltage issue.

6. Are there any temporary fixes for the 12V auxiliary battery voltage too low problem?

- You can try disconnecting and reconnecting the battery terminals to reset the system, but it is important to address the root cause of the issue to prevent further problems.

7. How much does it typically cost to repair OBDII code P1C22?

- The cost of repair can vary depending on the underlying cause, but it may involve replacing the auxiliary battery, repairing damaged connections, or addressing issues with the battery sensor.

8. Can I continue driving with the OBDII code P1C22 triggered?

- It is not recommended to ignore the code and continue driving, as it can lead to further electrical problems and potentially leave you stranded if the battery fails completely.

9. How long does it take to repair the 12V auxiliary battery voltage issue?

- The repair time can vary depending on the exact cause of the problem, but it typically takes a few hours to diagnose and fix issues related to the auxiliary battery and charging system.

10. Is the OBDII code P1C22 a serious issue that requires immediate attention?

- While the vehicle may still be operable with this code triggered, it is important to address the issue promptly to prevent potential breakdowns and further damage to the electrical system.