AutoCodes – Generic – C1838

C1838 Code - Charging System Fault

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Charging System. Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator 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: C1838 indicates Charging System Fault.
Common causes: Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator 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 3,835

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 Nov 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1838 Description

The Anti-Lock Brake System (ABS) Module monitors the Charging System. The ABS Module sets the OBDII code when the Charging System is not to factory specifications.

OBDII Code C1838 - Charging System Fault - AutoCodes.com — C1838 Code - Charging System Fault

What does this mean?

What are the Possible Causes of the DTC C1838?

Faulty Alternator
Alternator harness is open or shorted
Alternator circuit poor electrical connection

How to Fix the DTC C1838?

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 C1838 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.

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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 C1838 Code

1. What are the common symptoms of OBDII code C1838 - Charging System Fault?

- Common symptoms include dimming lights, difficulty starting the vehicle, frequent battery drain, and warning lights on the dashboard.

2. What are the possible causes of OBDII code C1838 - Charging System Fault?

- Possible causes include a faulty alternator, damaged battery, loose or corroded battery connections, defective voltage regulator, or issues with the wiring.

3. How can I diagnose the OBDII code C1838 - Charging System Fault?

- You can diagnose this code by using a diagnostic scanner to read the code and check the charging system components such as the alternator, battery, and related wiring for any issues.

4. What should I do if I encounter OBDII code C1838 - Charging System Fault?

- It is recommended to have the charging system inspected by a professional mechanic to determine the exact cause of the fault and perform necessary repairs.

5. Can I still drive my vehicle with OBDII code C1838 - Charging System Fault?

- It is not advisable to continue driving the vehicle with this code as it can lead to further damage to the electrical system and potentially leave you stranded due to a dead battery.

6. How much does it typically cost to repair OBDII code C1838 - Charging System Fault?

- The cost of repairing this code can vary depending on the underlying issue, but it may range from a simple battery replacement to a more complex alternator repair, costing anywhere from $100 to $800 or more.

7. Are there any preventive measures to avoid OBDII code C1838 - Charging System Fault?

- Regular maintenance of the charging system components, such as checking the battery and alternator health, ensuring proper connections, and timely replacement of worn-out parts, can help prevent this code from appearing.

8. Can a DIY enthusiast fix OBDII code C1838 - Charging System Fault?

- While some simple tasks like checking and tightening battery connections can be done by DIY enthusiasts, it is recommended to seek professional help for diagnosing and repairing complex issues related to the charging system.

9. Will resetting the OBDII code C1838 - Charging System Fault make it go away permanently?

- Simply resetting the code may clear the warning temporarily, but if the underlying issue is not addressed and fixed, the code is likely to reappear once the problem resurfaces.

10. Is it safe to ignore OBDII code C1838 - Charging System Fault?

- Ignoring this code can lead to potential damage to other electrical components of the vehicle and may result in a complete breakdown if the charging system fails completely. It is best not to ignore this warning and address the issue promptly.