AutoCodes – GMC – B1405 2018 GMC Sierra

B1405 2018 GMC Sierra Code - Control Module Voltage Reference Output 2 Circuit

Quick Answer

The parking assist sensors are 3-wire ultrasonic sensors that are used to determine the distance between the vehicle and an object. Common causes include Faulty Parking Assist Sensors, Parking Assist Sensors harness is open or shorted, Parking Assist Sensors 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: B1405 2018 GMC Sierra indicates Control Module Voltage Reference Output 2 Circuit.
Common causes: Common causes include Faulty Parking Assist Sensors, Parking Assist Sensors harness is open or shorted, Parking Assist Sensors 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 159

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 Apr 17, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1405 2018 GMC Sierra Description

The parking assist sensors are 3-wire ultrasonic sensors that are used to determine the distance between the vehicle and an object. The Parking Assist Control Module supplies a reference voltage to the parking assist sensors via the Parking Assist Sensor Reference Voltage circuit and provides ground via the low reference circuit. The Parking Assist Control Module triggers the sensors in a sequential loop. After each sensor transmits, the 6 Parking Assist Control Module uses the sensor echo received through the signal circuit to calculate the distance and position of an object.

OBDII Code B1405 2018 GMC Sierra - Control Module Voltage Reference Output 2 Circuit - AutoCodes.com — B1405 2018 GMC Sierra Code - Control Module Voltage Reference Output 2 Circuit

What does this mean?

What are the Possible Causes of the DTC B1405 2018 GMC Sierra?

Faulty Parking Assist Sensors
Parking Assist Sensors harness is open or shorted
Parking Assist Sensors circuit poor electrical connection
Faulty Parking Assist Control Module

How to Fix the DTC B1405 2018 GMC Sierra?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1405 2018 GMC Sierra 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 B1405 2018 GMC Sierra code?

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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 B1405 2018 GMC Sierra Code

1. What does the OBDII code B1405 mean on a 2018 GMC Sierra?

The B1405 code indicates an issue with the Control Module Voltage Reference Output 2 Circuit, which may involve a malfunction in the reference voltage signal provided by the control module.

2. What are the common symptoms of the B1405 code on a GMC Sierra?

Symptoms can include the check engine light turning on, intermittent electrical issues, or malfunctioning sensors relying on the voltage reference circuit.

3. What causes the B1405 code to appear on a 2018 GMC Sierra?

Common causes include damaged wiring or connectors, a short or open circuit, a faulty sensor, or a malfunctioning control module.

4. Can I still drive my GMC Sierra with the B1405 code active?

While the truck may still be drivable, unresolved voltage reference circuit issues can lead to further electrical malfunctions or sensor failures, so timely repair is recommended.

5. How do I diagnose the B1405 code on my 2018 GMC Sierra?

Start by inspecting the wiring and connectors in the voltage reference circuit for damage or corrosion, then test the control module and related sensors with a multimeter.

6. What tools are needed to fix the B1405 code?

Basic tools include a diagnostic scan tool, a multimeter for electrical testing, and possibly wiring repair tools if damaged connections are found.

7. What is the cost of repairing the B1405 code on a GMC Sierra?

Repair costs can vary but may range from $50 to $150 for simple wiring fixes, while replacing a faulty control module or sensor can cost several hundred dollars.

8. Can a faulty sensor trigger the B1405 code?

Yes, a faulty sensor that relies on the voltage reference circuit can cause this code if it disrupts the reference voltage signal.

9. How can I prevent the B1405 code from recurring?

Regularly inspect and maintain your vehicle's wiring, connectors, and sensors to prevent damage or corrosion that can lead to circuit issues.

10. Is the B1405 code specific to GMC Sierra trucks?

No, the B1405 code can appear on other GM vehicles with similar voltage reference circuit systems, but the exact diagnosis and repair steps may vary by model.