AutoCodes – Cadillac – U2122 Cadillac

U2122 Cadillac Code - Lost Communication With Radio Unit

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Radio Unit, Radio Unit harness is open or shorted, Radio Unit 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: U2122 Cadillac indicates Lost Communication With Radio Unit.
Common causes: Common causes include Faulty Radio Unit, Radio Unit harness is open or shorted, Radio Unit 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 1,957

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 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2122 Cadillac Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices 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 device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2122 Cadillac - Lost Communication With Radio Unit - AutoCodes.com — U2122 Cadillac Code - Lost Communication With Radio Unit

What does this mean?

What are the Possible Causes of the DTC U2122 Cadillac?

Faulty Radio Unit
Radio Unit harness is open or shorted
Radio Unit circuit poor electrical connection

How to Fix the DTC U2122 Cadillac?

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 U2122 Cadillac 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 U2122 Cadillac Code

1. What are some common symptoms of OBDII code U2122 in a Cadillac related to lost communication with the radio unit?

- Common symptoms include loss of audio system functionality, inability to control radio settings, and potentially a blank or frozen radio display.

2. What are some possible causes for the U2122 OBDII code indicating lost communication with the radio unit in a Cadillac?

- Causes can include a faulty radio unit, wiring or connection issues, a malfunctioning control module, or software glitches.

3. How can I troubleshoot the U2122 code in my Cadillac if I'm experiencing communication issues with the radio unit?

- Start by checking the radio fuse, ensuring all connections are secure, and considering a reset of the radio unit. If the issue persists, professional diagnosis may be needed.

4. Can a U2122 code related to lost communication with the radio unit in a Cadillac affect other vehicle systems?

- While the primary impact is on the radio unit, it's possible for communication issues to potentially disrupt other electronic systems in the vehicle.

5. Is it safe to continue driving my Cadillac with the U2122 code triggered by a lost communication with the radio unit?

- In most cases, it is safe to drive the vehicle with this code, but it's recommended to address the underlying communication issue to prevent potential malfunctions in other systems.

6. Are there any DIY repair tips for fixing the U2122 OBDII code indicating lost communication with the radio unit in a Cadillac?

- DIY repair tips can include checking and reconnecting all radio-related wiring, ensuring the radio unit is properly powered, and performing a reset of the radio system.

7. How much does it typically cost to repair the U2122 code related to lost communication with the radio unit in a Cadillac?

- Repair costs can vary widely depending on the underlying cause. Simple fixes like wiring repairs may be inexpensive, while replacing a faulty radio unit could be more costly.

8. Can a software update fix the U2122 code in a Cadillac caused by lost communication with the radio unit?

- In some cases, a software update provided by the manufacturer may address communication issues with the radio unit and clear the U2122 trouble code.

9. What should I do if the U2122 code persists in my Cadillac even after attempting basic troubleshooting steps?

- If the code persists, it's advisable to seek assistance from a qualified mechanic or dealership with diagnostic tools to pinpoint and resolve the communication issue.

10. Is the U2122 OBDII code related to lost communication with the radio unit a common issue in Cadillac vehicles?

- While not extremely common, communication issues leading to the U2122 code can occur in Cadillac vehicles, particularly in models with complex infotainment systems.