AutoCodes – Buick – U1814 Buick

U1814 Buick Code - Powertrain Wake-Up Communication Circuit

Quick Answer

The Body Control Module (BCM) activates the ignition circuit, when the ignition key is in ACC, ON or START. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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: U1814 Buick indicates Powertrain Wake-Up Communication Circuit.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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 487

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 Jul 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1814 Buick Description

The Body Control Module (BCM) activates the ignition circuit, when the ignition key is in ACC, ON or START. The ignition circuit wakes up the devices for serial data bus communication. The Diagnostic Trouble Code (DTC) will set when the BCM senses a short to ground on the ignition circuit.

OBDII Code U1814 Buick - Powertrain Wake-Up Communication Circuit - AutoCodes.com — U1814 Buick Code - Powertrain Wake-Up Communication Circuit

What does this mean?

What are the Possible Causes of the DTC U1814 Buick?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection

How to Fix the DTC U1814 Buick?

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 U1814 Buick 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 U1814 Buick code?

Need more information on how to fix the U1814 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1814 Buick code diagnosed by a professional: Find a repair shop in your area

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 U1814 Buick Code

1. What does the OBDII code U1814 mean on a Buick?

The U1814 code indicates an issue with the Powertrain Wake-Up Communication Circuit, which is responsible for ensuring proper communication between control modules when the vehicle is powered on.

2. What are the common symptoms of the U1814 code in a Buick?

Common symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, or difficulty starting the vehicle.

3. What causes the U1814 code to be triggered in a Buick?

This code can be caused by faulty wiring or connectors in the Powertrain Wake-Up Communication Circuit, a malfunctioning control module, or software issues.

4. Can I drive my Buick with the U1814 code active?

While the vehicle may still be drivable, itâ€™s not recommended to continue driving without addressing the issue, as it could lead to further damage or reduced performance.

5. How do I diagnose the U1814 code on my Buick?

Diagnosis involves checking for damaged wiring, inspecting connectors in the communication circuit, verifying module functionality, and using a scan tool to confirm the code.

6. What tools are needed to fix the U1814 code on a Buick?

Youâ€™ll need an OBDII scanner, a multimeter for electrical testing, wiring diagrams, and possibly replacement wiring or connectors.

7. How much does it cost to repair the U1814 code on a Buick?

Repair costs depend on the specific issue, but wiring or connector repairs typically cost $100-$300, while control module replacement could be $500 or more.

8. Can clearing the code with an OBDII scanner fix the U1814 issue?

Clearing the code may temporarily reset the system, but it wonâ€™t fix the underlying problem causing the U1814 code.

9. Is the U1814 code a common issue in all Buicks?

This code is not overly common but can occur in models with advanced communication systems, especially as components age.

10. Should I take my Buick to a professional mechanic for the U1814 code?

If youâ€™re unfamiliar with diagnosing electrical systems or working on vehicle electronics, itâ€™s best to consult a professional to avoid further complications.