AutoCodes – GMC – U0209 GMC

U0209 GMC Code - Lost Communication With Front Seat Heating 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 Front Seat Heating Control Module, Front Seat Heating Control Module harness is open or shorted, Front Seat Heating 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: U0209 GMC indicates Lost Communication With Front Seat Heating Control Module.
Common causes: Common causes include Faulty Front Seat Heating Control Module, Front Seat Heating Control Module harness is open or shorted, Front Seat Heating 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 676

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 U0209 GMC 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 Front Seat Heating Control Module has not been received.

OBDII Code U0209 GMC - Lost Communication With Front Seat Heating Control Module - AutoCodes.com — U0209 GMC Code - Lost Communication With Front Seat Heating Control Module

What does this mean?

What are the Possible Causes of the DTC U0209 GMC?

Faulty Front Seat Heating Control Module
Front Seat Heating Control Module harness is open or shorted
Front Seat Heating Control Module circuit poor electrical connection

How to Fix the DTC U0209 GMC?

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 U0209 GMC 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 U0209 GMC Code

1. What are the common symptoms of OBDII code U0209 in a GMC vehicle?

- Common symptoms include loss of communication with the front seat heating control module, non-functioning heated seats, and illuminated warning lights on the dashboard.

2. What can cause the OBDII code U0209 to trigger in a GMC vehicle?

- The code U0209 is typically triggered when there is a communication error between the vehicle's modules and the front seat heating control module, which can be caused by wiring issues, module failures, or software glitches.

3. How can I diagnose the OBDII code U0209 in my GMC vehicle?

- Diagnosis can be done using a professional OBDII scanner to retrieve the specific fault codes. Additionally, checking the wiring connections and inspecting the front seat heating control module for any visible damage can help pinpoint the issue.

4. Is it safe to continue driving with the OBDII code U0209 present in my GMC vehicle?

- While the vehicle may still be operable with this code, it is recommended to address the underlying communication issue promptly to prevent further electrical problems and ensure the proper functioning of the front seat heating system.

5. Can I repair the OBDII code U0209 issue in my GMC vehicle myself?

- If you have experience with automotive electrical systems, you may be able to troubleshoot and repair the U0209 code yourself by checking the wiring connections, inspecting the control module, and resetting the codes with a scanner. However, for complex issues, it is recommended to seek professional help.

6. Are there any common fixes for resolving the OBDII code U0209 in a GMC vehicle?

- Common fixes for the U0209 code include repairing any damaged wiring, replacing faulty control modules, updating software if applicable, and clearing the fault codes to reset the system.

7. How much does it typically cost to repair the OBDII code U0209 in a GMC vehicle?

- Repair costs can vary depending on the root cause of the issue, the extent of the repair needed, and whether you choose to do it yourself or seek professional help. Costs can range from a few hundred to over a thousand dollars.

8. Will fixing the OBDII code U0209 improve the performance of my GMC vehicle?

- Fixing the U0209 code is essential for restoring the proper functioning of the front seat heating system and ensuring the overall electrical stability of the vehicle. Resolving this issue can enhance comfort and convenience while driving.

9. Can extreme weather conditions affect the occurrence of the OBDII code U0209 in a GMC vehicle?

- Extreme temperatures or moisture levels can potentially exacerbate wiring issues or module failures, leading to the triggering of the U0209 code. It is important to address any underlying problems promptly, especially in harsh weather conditions.

10. Is the OBDII code U0209 specific to GMC vehicles, or can it occur in other car makes and models?

- The U0209 code related to lost communication with the front seat heating control module can occur in various car makes and models, as it is a generic OBDII code that signifies a communication error between modules in the vehicle's network.