AutoCodes – Toyota – C1939 Toyota

C1939 Toyota Code - Front Boosted Voltage

Quick Answer

The Active Stabilizer Converter supplies operating power to the Front Active Stabilizer Control ECU from the Front Active Stabilizer Control Actuator. Common causes include Faulty Active Stabilizer Converter, Faulty Battery (for active stabilizer), Active Stabilizer Converter harness is open or shorted. 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: C1939 Toyota indicates Front Boosted Voltage.
Common causes: Common causes include Faulty Active Stabilizer Converter, Faulty Battery (for active stabilizer), Active Stabilizer Converter harness is open or shorted.
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 789

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 Dec 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1939 Toyota Description

The Active Stabilizer Converter supplies operating power to the Front Active Stabilizer Control ECU from the Front Active Stabilizer Control Actuator. Also, when the battery (for active stabilizer) voltage is low, the Active Stabilizer Converter charges it. If a problem occurs in the Front Active Stabilizer Control ECU, Active Stabilizer Converter, battery (for active stabilizer) and PIG power source circuit, DTCs C1939/32 and C193C/32 are stored.

OBDII Code C1939 Toyota - Front Boosted Voltage - AutoCodes.com — C1939 Toyota Code - Front Boosted Voltage

What does this mean?

What are the Possible Causes of the DTC C1939 Toyota?

Faulty Active Stabilizer Converter
Faulty Battery (for active stabilizer)
Active Stabilizer Converter harness is open or shorted
Active Stabilizer Converter circuit poor electrical connection
Faulty Front Active Stabilizer Control ECU

How to Fix the DTC C1939 Toyota?

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 C1939 Toyota 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 C1939 Toyota code?

Need more information on how to fix the C1939 Toyota 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 C1939 Toyota Code

1. What are common symptoms of OBDII code C1939 in a Toyota related to Front Boosted Voltage?

- Common symptoms include poor engine performance, reduced fuel efficiency, and potential issues with starting the vehicle.

2. What are the possible causes of OBDII code C1939 related to Front Boosted Voltage in a Toyota?

- The code could be triggered by a faulty front boosted voltage sensor, issues with the wiring or connectors, or a problem with the vehicle's powertrain control module (PCM).

3. How can I diagnose the OBDII code C1939 in my Toyota that is related to Front Boosted Voltage?

- Diagnosing this code usually involves using a scan tool to retrieve the fault codes, checking the front boosted voltage sensor and its connections, and inspecting the wiring for any damage or corrosion.

4. Can I continue driving my Toyota with OBDII code C1939 related to Front Boosted Voltage?

- It is not recommended to continue driving the vehicle when this code is present, as it can lead to further damage and potential safety hazards.

5. How can I repair OBDII code C1939 in my Toyota that is related to Front Boosted Voltage?

- Repairing the issue may involve replacing the front boosted voltage sensor, repairing or replacing damaged wiring or connectors, or reprogramming the PCM if necessary.

6. Are there any DIY tips for resolving OBDII code C1939 in a Toyota related to Front Boosted Voltage?

- DIY tips include checking the sensor and wiring connections for any visible issues, ensuring all connections are secure, and clearing the fault codes with a scan tool to see if the issue recurs.

7. Is OBDII code C1939 related to Front Boosted Voltage a common problem in Toyota vehicles?

- This code is not as common as some other OBDII codes, but it can still occur in Toyota vehicles due to sensor or wiring issues.

8. How much does it typically cost to repair OBDII code C1939 in a Toyota related to Front Boosted Voltage?

- The cost of repairs can vary depending on the specific issue causing the code, but it may range from $100 to $500 or more, including parts and labor.

9. Can a mechanic easily fix OBDII code C1939 in a Toyota related to Front Boosted Voltage?

- A skilled mechanic with experience in diagnosing and repairing electrical issues should be able to effectively address this OBDII code in a Toyota.

10. How can I prevent OBDII code C1939 related to Front Boosted Voltage from occurring in my Toyota?

- Regular vehicle maintenance, such as checking and cleaning sensor connections, inspecting wiring for damage, and addressing any issues promptly, can help prevent this code from occurring.