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B1405 Cadillac Code - Control Module Voltage Reference Output 2 Circuit

Quick Answer

The B1405 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the Control Module Voltage Reference Output 2 Circuit. Common causes include Faulty Wiring: Damaged or corroded wiring leading to the control module can disrupt the voltage reference output, Loose Connectors: Loose or poor connections between the control module and other components can cause voltage issues, Control Module Failure: A malfunctioning control module itself can result in improper voltage output. 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
B1405 Cadillac indicates Control Module Voltage Reference Output 2 Circuit.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring leading to the control module can disrupt the voltage reference output, Loose Connectors: Loose or poor connections between the control module and other components can cause voltage issues, Control Module Failure: A malfunctioning control module itself can result in improper voltage output.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code B1405 Cadillac Description

The B1405 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the Control Module Voltage Reference Output 2 Circuit. This code indicates that there is a problem with the voltage reference output from a specific control module in the vehicle. The control module is responsible for regulating various systems and components in the vehicle, ensuring they receive the correct voltage for proper operation.

OBDII Code B1405 Cadillac - Control Module Voltage Reference Output 2 Circuit
B1405 Cadillac Code - Control Module Voltage Reference Output 2 Circuit

Common Causes of B1405 Cadillac

  1. Faulty Wiring: Damaged or corroded wiring leading to the control module can disrupt the voltage reference output.
  2. Loose Connectors: Loose or poor connections between the control module and other components can cause voltage issues.
  3. Control Module Failure: A malfunctioning control module itself can result in improper voltage output.
  4. Water Damage: Exposure to water or moisture can lead to corrosion in the wiring or connectors, affecting voltage supply.
  5. Electrical Short: A short circuit in the system can cause voltage fluctuations and trigger this code.

Symptoms of B1405 Cadillac

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Erratic Engine Performance: The vehicle may experience rough idling, stalling, or hesitation during acceleration due to the voltage reference issue.
  3. Electrical Malfunctions: Various electrical components in the vehicle, such as power windows, lights, or the radio, may not function properly.
  4. Transmission Issues: The transmission may shift erratically or experience slipping due to the voltage reference problem.
  5. Reduced Fuel Efficiency: The vehicle may consume more fuel than usual due to the inefficient operation of certain systems.

How to Fix B1405 Cadillac

  1. Diagnostic Scan: Use a diagnostic scanner to retrieve the specific details of the code and pinpoint the exact source of the issue.
  2. Visual Inspection: Inspect the wiring, connectors, and control module for any signs of damage, corrosion, or loose connections.
  3. Repair or Replace Wiring: Repair any damaged wiring or connectors, or replace them if necessary to ensure proper voltage supply.
  4. Test Control Module: Test the control module to determine if it is functioning correctly, and replace it if it is found to be faulty.
  5. Clear Codes and Test Drive: Clear the DTC from the vehicle's system, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix B1405 Cadillac

The typical repair costs for addressing the B1405 DTC can vary depending on the extent of the issue and the specific components that need to be repaired or replaced. In general, the cost for parts such as wiring, connectors, or a control module can range from $100 to $500 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair bill can add up to several hundred dollars or more. It's advisable to consult with a qualified mechanic or dealership to get an accurate estimate based on the specific diagnosis and repair needed for your Cadillac vehicle.

What does this mean?

Tech Notes for B1405 Cadillac

B1405:02 Control Module Voltage Reference Output 2 Circuit Short to Ground

B1405:03 Control Module Voltage Reference Output 2 Circuit Low Voltage

B1405:07 Control Module Voltage Reference Output 2 Circuit High Voltage



If the B1405 code is stored in the Seat Memory Control Module, check the Seat Motor and Seat Memory Control Module.

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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 B1405 Cadillac Code

1. What does the OBDII code B1405 mean on a Cadillac?

The B1405 code indicates a problem with the Control Module Voltage Reference Output 2 Circuit, which is responsible for providing a stable voltage reference to certain sensors.

2. What are the common symptoms of the B1405 code in a Cadillac?

Symptoms can include warning lights on the dashboard, erratic sensor readings, poor engine performance, or intermittent electrical issues.

3. What causes the B1405 code to appear in a Cadillac?

The code can be caused by a faulty control module, damaged wiring, loose or corroded connections, or a short circuit in the voltage reference circuit.

4. How is the B1405 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the voltage reference circuit for continuity or shorts.

5. Can a faulty sensor trigger the B1405 code?

Yes, if a sensor that relies on the voltage reference circuit is defective, it can cause irregularities that trigger the code.

6. Is it safe to drive a Cadillac with the B1405 code?

It may be safe to drive short distances, but ignoring the issue can lead to further electrical or engine performance problems. It’s best to address it promptly.

7. How do you fix the B1405 code in a Cadillac?

Repairs may involve replacing damaged wiring, cleaning or tightening connectors, or replacing the faulty control module or sensor.

8. Can a discharged battery cause the B1405 code?

A weak or discharged battery can sometimes cause voltage irregularities that might trigger the code, so the battery should be checked as part of the diagnosis.

9. What tools are needed to troubleshoot the B1405 code?

A multimeter and an OBDII scan tool are essential for testing the circuit and confirming the code.

10. Can the B1405 code clear itself?

In rare cases, if the issue is intermittent, the code may clear itself, but it’s recommended to investigate and repair the underlying problem to prevent recurrence.

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