AutoCodes – Generic – U1884

U1884 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 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 888

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 Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1884 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 - Hybrid Control Module Lost Communication With Passenger Door Module - AutoCodes.com — U1884 Code - Hybrid Control Module Lost Communication With Passenger Door Module

What does this mean?

What are the Possible Causes of the DTC U1884?

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?

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 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 U1884 code?

Need more information on how to fix the U1884 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1884 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1884 Buick — Hybrid Control Module Lost Communication With Passenger Door Module
U1884 Cadillac — Hybrid Control Module Lost Communication With Passenger Door Module
U1884 Chevrolet — Hybrid Control Module Lost Communication With Passenger Door Module
U1884 GMC — Hybrid Control Module Lost Communication With Passenger Door Module

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 Code

1. What are the common symptoms of OBDII code U1884?

The common symptoms of OBDII code U1884 include non-functional power windows, door locks, and interior lights on the passenger side of the vehicle.

2. What does the OBDII code U1884 indicate?

OBDII code U1884 indicates that there is a communication problem between the hybrid control module and the passenger door module in a hybrid vehicle.

3. What are the possible causes of OBDII code U1884?

Possible causes of OBDII code U1884 include a faulty hybrid control module, a malfunctioning passenger door module, wiring issues, or loose connections between the modules.

4. How can I diagnose the cause of OBDII code U1884?

Diagnosing the cause of OBDII code U1884 involves conducting a thorough inspection of the hybrid control module, the passenger door module, and the wiring connections between the two modules. Using a diagnostic scan tool can help pinpoint the exact issue.

5. Can I still drive my vehicle with OBDII code U1884?

It is generally not recommended to drive your vehicle with OBDII code U1884, as it can lead to further electrical issues and potential safety hazards. It is best to address the problem promptly.

6. How can I repair OBDII code U1884?

Repairing OBDII code U1884 may involve replacing the faulty hybrid control module, repairing or replacing the passenger door module, fixing wiring issues, or ensuring proper connections between the modules.

7. Can I reset OBDII code U1884 without fixing the underlying issue?

Resetting OBDII code U1884 without addressing the underlying communication problem between the hybrid control module and the passenger door module will likely result in the code reappearing once the issue persists.

8. Are there any DIY repair tips for OBDII code U1884?

DIY repair tips for OBDII code U1884 may include checking and tightening wiring connections, inspecting for visible damage to the modules, and ensuring proper module functionality. However, complex repairs may require professional assistance.

9. How much does it cost to fix OBDII code U1884?

The cost to fix OBDII code U1884 can vary depending on the specific issue causing the code, the extent of the repairs needed, and labor costs. It is recommended to obtain a diagnosis from a qualified technician for an accurate estimate.

10. Is OBDII code U1884 specific to hybrid vehicles only?

Yes, OBDII code U1884, indicating a communication problem between the hybrid control module and passenger door module, is specific to hybrid vehicles. It may not apply to non-hybrid vehicles.