AutoCodes – Cadillac – U1814 Cadillac

U1814 Cadillac 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 Cadillac 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 805

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

What does this mean?

What are the Possible Causes of the DTC U1814 Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

1. What are the common symptoms of OBDII code U1814 in a Cadillac related to the Powertrain Wake-Up Communication Circuit?

The common symptoms include issues with starting the vehicle, rough idling, poor acceleration, and potential stalling while driving.

2. What are the possible causes of the U1814 code in a Cadillac?

The code U1814 in a Cadillac is often triggered by a faulty powertrain control module (PCM), wiring issues, loose connections, or a malfunctioning communication circuit.

3. How can I diagnose the root cause of the U1814 code in my Cadillac?

To diagnose the U1814 code, you can perform a thorough inspection of the wiring and connectors related to the Powertrain Wake-Up Communication Circuit, check for loose connections, and use a diagnostic scanner to analyze the PCM data.

4. Are there any common repair tips for resolving the U1814 code in a Cadillac?

Common repair tips include checking and repairing any damaged wiring, ensuring all connections are secure, resetting the PCM codes, and, if necessary, replacing the powertrain control module.

5. Can I continue driving my Cadillac with the U1814 code present?

It is not recommended to drive your Cadillac with the U1814 code present, as it can lead to further damage to the vehicle and potentially unsafe driving conditions. It is best to address the issue promptly.

6. How much does it typically cost to repair the U1814 code in a Cadillac?

The cost of repairing the U1814 code in a Cadillac can vary depending on the root cause of the issue. Repairs may range from simple wiring fixes to more complex PCM replacements, so costs can vary accordingly.

7. Is the U1814 code specific to Cadillac vehicles only?

The U1814 code related to the Powertrain Wake-Up Communication Circuit is not specific to Cadillac vehicles and can be found in various vehicle makes and models equipped with OBDII systems.

8. Can I reset the U1814 code in my Cadillac using an OBDII scanner?

Yes, you can use an OBDII scanner to reset the U1814 code in your Cadillac after addressing the root cause of the issue. However, if the problem persists, the code may reappear.

9. How urgent is it to address the U1814 code in a Cadillac?

It is recommended to address the U1814 code in a Cadillac as soon as possible to prevent further damage to the vehicle and ensure safe driving conditions. Ignoring the code can lead to more severe issues over time.

10. Will the U1814 code cause my Cadillac to fail an emissions test?

Yes, the U1814 code can cause your Cadillac to fail an emissions test, as it indicates a problem with the Powertrain Wake-Up Communication Circuit, which can affect the vehicle's emissions control system.