AutoCodes – GMC – U1814 2016 GMC Sierra

U1814 2016 GMC Sierra 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 2016 GMC Sierra 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 212

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 2016 GMC Sierra 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 2016 GMC Sierra - Powertrain Wake-Up Communication Circuit - AutoCodes.com — U1814 2016 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

What does this mean?

What are the Possible Causes of the DTC U1814 2016 GMC Sierra?

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 2016 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1814 2016 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 U1814 2016 GMC Sierra code?

Need more information on how to fix the U1814 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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 U1814 2016 GMC Sierra Code

1. What does the OBDII code U1814 mean on a 2016 GMC Sierra?

Code U1814 indicates a problem in the Powertrain Wake-Up Communication Circuit, which is responsible for ensuring proper communication between the vehicle's control modules during startup.

2. What are the common symptoms of code U1814 in a 2016 GMC Sierra?

Common symptoms include delayed engine start, rough idling, communication errors between control modules, or the check engine light being illuminated.

3. What causes the U1814 code to appear on a GMC Sierra?

The code can be triggered by faulty wiring, a damaged Powertrain Control Module (PCM), a malfunctioning Body Control Module (BCM), or corroded/loose electrical connections in the communication circuit.

4. Can driving with the U1814 code cause further damage?

While the vehicle may still operate, ignoring the issue can lead to communication failures between critical systems, potentially affecting performance and safety over time.

5. How do you diagnose a U1814 code on a 2016 GMC Sierra?

Diagnosis involves using an advanced scan tool to check for related codes, inspecting wiring and connectors for damage or corrosion, and testing the affected control modules for functionality.

6. What are the recommended repairs for the U1814 code?

Repairs may include repairing or replacing damaged wiring, cleaning corroded connectors, reprogramming or replacing faulty control modules, or inspecting the wake-up circuit for proper operation.

7. Can a software update fix the U1814 code?

In some cases, a software update for the control modules may resolve communication issues, but this depends on the root cause of the problem.

8. How much does it cost to fix a U1814 code on a 2016 GMC Sierra?

Repair costs vary depending on the issue but can range from $100 for simple wiring repairs to over $1,000 if module replacement or extensive diagnostics are required.

9. Is the U1814 code a common issue for the 2016 GMC Sierra?

It is not a widespread issue but can occur if the vehicle experiences electrical problems or if there is wear and tear in the communication circuit.

10. Can a dead battery cause the U1814 code to appear?

Yes, a weak or dead battery can disrupt the powertrain wake-up circuit and trigger the U1814 code. Ensure the battery is fully charged and in good condition before further diagnostics.