AutoCodes – Buick – U1884 Buick

U1884 Buick Code - Hybrid Control Module Lost Communication With Passenger Door Module

Quick Answer

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Passenger Door Module (PDM), Passenger Door Module harness is open or shorted, Passenger Door 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: U1884 Buick indicates Hybrid Control Module Lost Communication With Passenger Door Module.
Common causes: Common causes include Faulty Passenger Door Module (PDM), Passenger Door Module harness is open or shorted, Passenger Door 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 574

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1884 Buick Description

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The Diagnostic Trouble Code (DTC) is reported on a class 2 link to the scan tool by Powertrain Control Module (PCM) even if they may be set by different modules. The DTC will set when a node alive message has not been received from an identified module within the last 5 seconds after establishing class 2 serial data communication, or a supervised high-speed GMLAN message has not been received.

OBDII Code U1884 Buick - Hybrid Control Module Lost Communication With Passenger Door Module - AutoCodes.com — U1884 Buick Code - Hybrid Control Module Lost Communication With Passenger Door Module

What does this mean?

What are the Possible Causes of the DTC U1884 Buick?

Faulty Passenger Door Module (PDM)
Passenger Door Module harness is open or shorted
Passenger Door Module circuit poor electrical connection
Faulty Hybrid Control Module (HCM)

How to Fix the DTC U1884 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 U1884 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.

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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 U1884 Buick Code

1. What does the OBDII code U1884 mean on a Buick?

Code U1884 indicates that the Hybrid Control Module has lost communication with the Passenger Door Module, signaling a problem in the vehicle's communication network.

2. What are the common symptoms of a U1884 code on a Buick?

Symptoms may include malfunctioning power windows or locks on the passenger side, warning lights on the dashboard, or intermittent communication issues with the vehicle's control systems.

3. What causes the U1884 code to appear on a Buick?

Common causes include a faulty Passenger Door Module, damaged wiring or connectors in the communication network, or a malfunction in the Hybrid Control Module.

4. Can a U1884 code cause drivability issues?

In most cases, a U1884 code does not directly affect drivability, but it may cause problems with passenger-side electronics or other related systems.

5. How do I diagnose a U1884 code on a Buick?

Start by inspecting the wiring and connectors between the Hybrid Control Module and Passenger Door Module for damage or corrosion. Use a diagnostic scan tool to check for related codes and test module communication.

6. Is the U1884 code specific to hybrid Buick models?

Yes, this code is specific to hybrid Buick models as it involves the Hybrid Control Module.

7. Can I clear the U1884 code without repairing the issue?

Clearing the code without addressing the root cause may temporarily remove it, but the problem will likely return until the underlying issue is fixed.

8. How much does it cost to fix a U1884 code on a Buick?

Repair costs vary depending on the root cause but may include expenses for wiring repairs, module replacement, or labor, ranging from $100 to $500 or more.

9. Can a bad battery cause a U1884 code on a Buick?

A low or failing battery can sometimes cause communication issues between modules, potentially triggering the U1884 code.

10. Should I take my Buick to a dealer for a U1884 code?

If basic diagnostics donâ€™t resolve the issue, itâ€™s recommended to take the vehicle to a dealer or qualified technician with experience in hybrid systems and module communication.