AutoCodes – Cadillac – P3051 Cadillac

P3051 Cadillac Code - DC/DC Converter Actuator Voltage Sensor Circuit 1 Low Voltage

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: P3051 Cadillac indicates DC/DC Converter Actuator Voltage Sensor Circuit 1 Low Voltage.
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 998

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 P3051 Cadillac 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 P3051 Cadillac - DC/DC Converter Actuator Voltage Sensor Circuit 1 Low Voltage - AutoCodes.com — P3051 Cadillac Code - DC/DC Converter Actuator Voltage Sensor Circuit 1 Low Voltage

What does this mean?

What are the Possible Causes of the DTC P3051 Cadillac?

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

How to Fix the DTC P3051 Cadillac?

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 P3051 Cadillac 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 P3051 Cadillac Code

1. What does the OBDII code P3051 mean on a Cadillac?

The P3051 code indicates a low voltage issue in the DC/DC Converter Actuator Voltage Sensor Circuit 1, which is part of the hybrid or electrical system in the vehicle.

2. What are the common symptoms of the P3051 code in a Cadillac?

Symptoms may include the check engine light or hybrid system warning light turning on, reduced vehicle performance, battery charging issues, or failure to switch between electric and gas modes in hybrid models.

3. What causes the P3051 code to appear in a Cadillac?

Possible causes include a faulty DC/DC converter voltage sensor, damaged or corroded wiring in the circuit, loose electrical connections, or a failing DC/DC converter.

4. Can I drive my Cadillac with the P3051 code?

Itâ€™s not recommended to drive with this code for long, as it may lead to further electrical system damage or leave the vehicle stranded if the hybrid system malfunctions.

5. How do I diagnose the P3051 code in a Cadillac?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the wiring and connections to the DC/DC converter, and testing the voltage sensor and converter for proper operation.

6. How do I fix the P3051 code on a Cadillac?

Repair may involve replacing the DC/DC converter voltage sensor, repairing or replacing damaged wiring, securing loose connections, or replacing the DC/DC converter if itâ€™s determined to be faulty.

7. What tools are needed to troubleshoot the P3051 code in a Cadillac?

Youâ€™ll need an OBDII scanner, a multimeter to test voltage and continuity, and possibly a wiring diagram for the vehicleâ€™s hybrid or electrical system.

8. How much does it cost to repair the P3051 code on a Cadillac?

Repair costs vary depending on the issue, but replacing a DC/DC converter can cost between $500 and $2,000, while wiring repairs are typically less expensive.

9. Can a weak hybrid battery cause the P3051 code in a Cadillac?

While itâ€™s unlikely, a weak or failing hybrid battery can sometimes contribute to voltage irregularities, so itâ€™s worth testing the battery as part of the diagnosis.

10. Is the P3051 code specific to Cadillacs?

No, the P3051 code can appear in other vehicles with similar hybrid or electrical system designs, but the specific diagnosis and repair steps may vary by manufacturer.