AutoCodes – GMC – P3055 GMC

P3055 GMC 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 GMC 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 6,498

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

What does this mean?

What are the Possible Causes of the DTC P3055 GMC?

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 GMC?

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 GMC 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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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 GMC Code

1. What does the OBDII code P3055 GMC indicate?

The P3055 GMC indicates an issue with the DC/DC Converter Actuator Voltage 1 Performance, suggesting that the voltage levels are outside the expected range or the performance is not meeting the preset standards.

2. What are common symptoms of the P3055 GMC code?

Symptoms may include a malfunction indicator lamp (MIL) or check engine light on the dashboard, reduced vehicle performance, potential issues with battery charging, or even the vehicle failing to start.

3. What can cause the P3055 GMC code to appear?

Common causes include faulty or damaged DC/DC converter, poor electrical connections in the converter circuit, or a malfunctioning battery management system.

4. How can I diagnose the P3055 GMC code?

Diagnosis should begin with reading the code using an OBDII scanner, followed by a thorough inspection of the DC/DC converter, checking all related wiring and connectors for damage or corrosion, and testing voltage outputs to ensure they align with manufacturer specifications.

5. What are the potential repairs for fixing the P3055 GMC code?

Repairs may involve replacing the faulty DC/DC converter, repairing or replacing damaged wiring or connectors, or updating/reprogramming the battery management system software if necessary.

6. Is it safe to drive with the P3055 GMC code?

Driving with this code is not recommended as it might lead to further electrical system complications or a failure to start the vehicle, potentially leaving you stranded.

7. How urgent is it to address the P3055 GMC code?

It is fairly urgent to address this code because the DC/DC converter plays a crucial role in vehicle electrical system performance and battery management, which are vital for the vehicle's operation.

8. Can a faulty DC/DC converter affect fuel economy?

Yes, a malfunctioning DC/DC converter can affect the overall efficiency of the vehicleâ€™s electrical system, potentially leading to poorer fuel economy due to less efficient battery charging and increased strain on the engine.

9. What tools are required to diagnose the P3055 GMC code?

Diagnosing this code typically requires an OBDII scanner, a multimeter for voltage checks, and possibly an oscilloscope to monitor the performance of the DC/DC converter more closely.