AutoCodes – Chevrolet – U0204 Chevrolet

U0204 Chevrolet Code - Lost Communication With Right Rear Door Switch Panel Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Right Rear Door Switch Panel Control Module, Right Rear Door Switch Panel Control Module harness is open or shorted, Right Rear Door Switch Panel 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: U0204 Chevrolet indicates Lost Communication With Right Rear Door Switch Panel Control Module.
Common causes: Common causes include Faulty Right Rear Door Switch Panel Control Module, Right Rear Door Switch Panel Control Module harness is open or shorted, Right Rear Door Switch Panel 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 743

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 Apr 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0204 Chevrolet Description

Modules connected to the 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 modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Right Rear Door Switch Panel Control Module has not been received.

OBDII Code U0204 Chevrolet - Lost Communication With Right Rear Door Switch Panel Control Module - AutoCodes.com — U0204 Chevrolet Code - Lost Communication With Right Rear Door Switch Panel Control Module

What does this mean?

What are the Possible Causes of the DTC U0204 Chevrolet?

Faulty Right Rear Door Switch Panel Control Module
Right Rear Door Switch Panel Control Module harness is open or shorted
Right Rear Door Switch Panel Control Module circuit poor electrical connection

How to Fix the DTC U0204 Chevrolet?

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 U0204 Chevrolet 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 U0204 Chevrolet Code

1. What does the OBDII code U0204 mean on a Chevrolet?

U0204 indicates that the vehicle has lost communication with the Right Rear Door Switch Panel Control Module, which could affect the functionality of the right rear door controls.

2. What are common symptoms of the U0204 code on a Chevrolet?

Symptoms may include inoperative right rear door switches for windows or locks, unresponsive interior lights for that door, or no communication when scanning the module.

3. What causes the U0204 code to activate?

Common causes include a faulty Right Rear Door Switch Panel Control Module, damaged wiring or connectors, poor grounding, or a software issue in the vehicle's communication network.

4. Can a dead battery cause the U0204 code in my Chevrolet?

Yes, a dead or weak battery can disrupt the communication network, potentially triggering the U0204 code.

5. How can I diagnose the U0204 code on a Chevrolet?

Start by inspecting the wiring and connectors for the right rear door module, checking for damage or corrosion. Use a scan tool to confirm if the module is unresponsive and verify power and ground signals.

6. Is it safe to drive with the U0204 code on my Chevrolet?

Yes, the vehicle is generally safe to drive, but the right rear door controls may not function properly, which can be inconvenient.

7. How do I fix the U0204 code on a Chevrolet?

Repairs may include replacing the Right Rear Door Switch Panel Control Module, repairing damaged wiring or connectors, or updating the vehicleâ€™s software.

8. Can I clear the U0204 code without fixing it?

Clearing the code without addressing the issue may work temporarily, but the code will likely return if the underlying problem isnâ€™t resolved.

9. How much does it cost to repair the U0204 code on a Chevrolet?

Repair costs vary, but replacing the module can range from $200 to $500, while wiring repairs may cost less depending on the extent of damage.

10. Do I need a professional to fix the U0204 code on a Chevrolet?

While some issues like checking connectors can be done at home, diagnosing and replacing a module or repairing wiring may require professional tools and expertise.