AutoCodes – GMC – U0122 GMC

U0122 GMC Code - Lost Communication With Vehicle Stability 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 Vehicle Stability Control Module, Vehicle Stability Control Module harness is open or shorted, Vehicle Stability 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: U0122 GMC indicates Lost Communication With Vehicle Stability Control Module.
Common causes: Common causes include Faulty Vehicle Stability Control Module, Vehicle Stability Control Module harness is open or shorted, Vehicle Stability 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 2,628

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 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0122 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 Vehicle Stability Control Module has not been received.

OBDII Code U0122 GMC - Lost Communication With Vehicle Stability Control Module - AutoCodes.com — U0122 GMC Code - Lost Communication With Vehicle Stability Control Module

What does this mean?

What are the Possible Causes of the DTC U0122 GMC?

Faulty Vehicle Stability Control Module
Vehicle Stability Control Module harness is open or shorted
Vehicle Stability Control Module circuit poor electrical connection

How to Fix the DTC U0122 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 U0122 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 U0122 GMC Code

1. What are the common symptoms of OBDII code U0122 GMC?

- Common symptoms include the ABS warning light, traction control light, and stability control light illuminating on the dashboard. Additionally, issues with the vehicle's stability control system may be experienced.

2. What does the OBDII code U0122 GMC indicate?

- The code U0122 indicates that there is a communication problem between the vehicle's onboard computer system and the Vehicle Stability Control Module.

3. What are some possible causes of the U0122 GMC code?

- Possible causes include a faulty Vehicle Stability Control Module, damaged wiring or connectors, a weak or dead battery, or issues with the CAN bus communication system.

4. How can I diagnose the U0122 code on my GMC vehicle?

- Diagnosis typically involves using an OBDII scanner to retrieve the code and checking for any additional related codes. A thorough inspection of the wiring and connectors related to the Vehicle Stability Control Module is also recommended.

5. Can I still drive my vehicle with the U0122 code present?

- It is not recommended to drive the vehicle with the U0122 code present, as it could affect the vehicle's stability control system and potentially compromise safety.

6. How can I repair the U0122 GMC code?

- Repair options may include replacing the Vehicle Stability Control Module, repairing any damaged wiring or connectors, ensuring the battery is in good condition, and addressing any issues with the CAN bus communication system.

7. Will resetting the trouble codes make the U0122 code disappear?

- Resetting the trouble codes may temporarily clear the U0122 code, but if the underlying issue causing the communication problem is not addressed, the code is likely to reappear.

8. Is the U0122 GMC code a serious issue?

- Yes, the U0122 code is a serious issue as it indicates a communication problem with an essential safety system in the vehicle, which can impact its stability and control.

9. Can a DIY enthusiast repair the U0122 code?

- Repairing the U0122 code may require advanced diagnostic tools and technical knowledge. It is recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

10. How much does it typically cost to fix the U0122 GMC code?

- The cost of fixing the U0122 code can vary depending on the specific cause of the issue, parts needed for repair, and labor costs. It is advisable to get a diagnostic assessment from a qualified technician for an accurate estimate.