AutoCodes – GMC – U2172 GMC

U2172 GMC Code - Lost Communication With Digital Radio Receiver

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Digital Radio Receiver (DRR), Digital Radio Receiver harness is open or shorted, Digital Radio Receiver 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: U2172 GMC indicates Lost Communication With Digital Radio Receiver.
Common causes: Common causes include Faulty Digital Radio Receiver (DRR), Digital Radio Receiver harness is open or shorted, Digital Radio Receiver 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 702

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 U2172 GMC 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 U2172 GMC - Lost Communication With Digital Radio Receiver - AutoCodes.com — U2172 GMC Code - Lost Communication With Digital Radio Receiver

What does this mean?

What are the Possible Causes of the DTC U2172 GMC?

Faulty Digital Radio Receiver (DRR)
Digital Radio Receiver harness is open or shorted
Digital Radio Receiver circuit poor electrical connection

How to Fix the DTC U2172 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 U2172 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 U2172 GMC Code

1. What does the OBDII code U2172 mean on a GMC?

U2172 indicates that the vehicle's control modules have lost communication with the Digital Radio Receiver (DRR), which manages the radio and audio system.

2. What are the common symptoms of code U2172 in a GMC?

Symptoms may include no audio output, an unresponsive radio, infotainment system glitches, or error messages on the dashboard screen.

3. What causes the U2172 code to appear in a GMC?

Common causes include a faulty digital radio receiver, wiring or connector issues, blown fuses, or a software glitch in the infotainment system.

4. Can a blown fuse cause the U2172 code on a GMC?

Yes, a blown fuse supplying power to the digital radio receiver can interrupt communication and trigger the U2172 code.

5. How do I diagnose the U2172 code in a GMC?

Start by checking the fuses, wiring, and connectors for damage. Use a scan tool to test for communication between the radio receiver and other modules.

6. Can a software update fix the U2172 code on my GMC?

Yes, in some cases, updating the vehicleâ€™s infotainment system software can resolve communication issues and clear the code.

7. Is the U2172 code related to the vehicleâ€™s radio not working?

Yes, this code is directly related to the digital radio receiver, so a non-functional radio could be a symptom of this issue.

8. Can driving with the U2172 code damage my GMC?

No, this code does not affect engine performance or drivability, but it may cause issues with the audio system and infotainment features.

9. How much does it cost to fix the U2172 code on a GMC?

Repair costs vary depending on the problem but can range from $50 for simple wiring fixes to over $500 if the digital radio receiver needs replacement.

10. Can I clear the U2172 code without fixing the issue?

You can clear the code with a scan tool, but it will likely reappear until the underlying communication problem is resolved.