AutoCodes – Generic – P3055

P3055 Code - DC/DC Converter Actuator Voltage 1 Performance

Quick Answer

The Power Supply Transformer is used to boost battery voltage to sensitive loads during engine restart. Common causes include Faulty Power Supply Transformer, Power Supply Transformer harness is open or shorted, Power Supply Transformer 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: P3055 indicates DC/DC Converter Actuator Voltage 1 Performance.
Common causes: Common causes include Faulty Power Supply Transformer, Power Supply Transformer harness is open or shorted, Power Supply Transformer 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 13,455

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 May 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P3055 Description

The Power Supply Transformer is used to boost battery voltage to sensitive loads during engine restart. It provides two voltage outputs that provide the boosted voltage. The Power Supply Transformer communicates to the Engine Control Module (ECM). When the engine is not cranking, the Power Supply Transformer passes through voltage from the two supply circuits. The ECM receives data about the sensed output voltages provided by the Power Supply Transformer.

OBDII Code P3055 - DC/DC Converter Actuator Voltage 1 Performance - AutoCodes.com — P3055 Code - DC/DC Converter Actuator Voltage 1 Performance

What does this mean?

What are the Possible Causes of the DTC P3055?

Faulty Power Supply Transformer
Power Supply Transformer harness is open or shorted
Power Supply Transformer circuit poor electrical connection

How to Fix the DTC P3055?

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 P3055 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 P3055 code?

Need more information on how to fix the P3055 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P3055 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P3055 Buick — DC/DC Converter Actuator Voltage 1 Performance
P3055 Cadillac — DC/DC Converter Actuator Voltage 1 Performance
P3055 Chevrolet — DC/DC Converter Actuator Voltage 1 Performance
P3055 GMC — DC/DC Converter Actuator Voltage 1 Performance

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 P3055 Code

1. What are the common symptoms of OBDII code P3055?

The common symptoms of OBDII code P3055, DC/DC Converter Actuator Voltage 1 Performance, include poor fuel economy, engine misfires, and a decrease in overall vehicle performance.

2. What are the possible causes of OBDII code P3055?

The possible causes of OBDII code P3055 can include a faulty DC/DC converter actuator, damaged wiring or connectors related to the actuator, or a problem with the power supply to the actuator.

3. How can I diagnose OBDII code P3055?

Diagnosing OBDII code P3055 involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors related to the DC/DC converter actuator, and testing the actuator itself for proper functionality.

4. Can I still drive my vehicle with OBDII code P3055 present?

It is not recommended to drive your vehicle with OBDII code P3055 present, as it can lead to further damage to the vehicle and potentially cause safety issues. It is best to address the issue promptly.

5. How do I repair OBDII code P3055?

Repairing OBDII code P3055 typically involves replacing the faulty DC/DC converter actuator, repairing or replacing any damaged wiring or connectors, and clearing the code with an OBDII scanner.

6. Are there any DIY tips for fixing OBDII code P3055?

While some basic troubleshooting steps can be taken, fixing OBDII code P3055 often requires specialized tools and expertise. It is recommended to seek assistance from a qualified mechanic for proper diagnosis and repair.

7. What happens if OBDII code P3055 is ignored?

Ignoring OBDII code P3055 can lead to decreased fuel efficiency, engine performance issues, and potential damage to other components in the vehicle. It is important to address the issue promptly to prevent further problems.

8. Can a low battery voltage trigger OBDII code P3055?

Yes, a low battery voltage can sometimes trigger OBDII code P3055 due to the impact it has on the performance of the DC/DC converter actuator. Ensuring the battery is in good condition is important for overall vehicle health.

9. How long does it take to repair OBDII code P3055?

The time it takes to repair OBDII code P3055 can vary depending on the exact cause of the issue and the availability of parts. In general, it can take a few hours to a full day to diagnose and repair the problem.

10. Is OBDII code P3055 a common issue in certain vehicle makes and models?

OBDII code P3055 can be more common in hybrid or electric vehicles that have a DC/DC converter system. However, it can still occur in traditional internal combustion engine vehicles that utilize similar components.