AutoCodes – GMC – U1814 2017 GMC Sierra

U1814 2017 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 2017 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 217

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 2017 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 2017 GMC Sierra - Powertrain Wake-Up Communication Circuit - AutoCodes.com — U1814 2017 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

What does this mean?

What are the Possible Causes of the DTC U1814 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the U1814 2017 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 2017 GMC Sierra Code

1. What does the OBDII code U1814 mean on a 2017 GMC Sierra?

The code U1814 indicates a fault in the Powertrain Wake-Up Communication Circuit, which is responsible for ensuring proper communication between control modules when the vehicle is started.

2. What are the common symptoms of the U1814 code on a 2017 GMC Sierra?

Symptoms may include a no-start condition, difficulty starting the vehicle, illuminated check engine light, or other warning lights on the dashboard.

3. What causes the U1814 code to appear on a 2017 GMC Sierra?

Common causes include faulty wiring or connectors in the wake-up communication circuit, a malfunctioning control module, or an issue with the battery or power supply.

4. Can a low battery cause the U1814 code on a 2017 GMC Sierra?

Yes, a weak or low battery can disrupt the powertrain wake-up circuit and trigger the U1814 code.

5. How do I diagnose the U1814 code on my 2017 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, checking the battery voltage, and using a scan tool to monitor communication between control modules.

6. Is the U1814 code serious on a 2017 GMC Sierra?

Yes, it can be serious, as it may prevent the vehicle from starting or cause other powertrain communication issues.

7. How do I fix the U1814 code on a 2017 GMC Sierra?

Repairs may include repairing or replacing damaged wiring, cleaning or reconnecting corroded connectors, or replacing a faulty control module if necessary.

8. Can I drive my 2017 GMC Sierra with the U1814 code?

Driving may be possible, but it is not recommended as the issue can worsen or result in a no-start condition.

9. How much does it cost to fix the U1814 code on a 2017 GMC Sierra?

Repair costs vary depending on the issue but may range from $100 for simple wiring repairs to over $1,000 if a control module needs replacement.

10. Can a software update fix the U1814 code on a 2017 GMC Sierra?

In some cases, a software update for the affected control module may resolve the issue, but a proper diagnosis is needed to determine if this is the solution.