AutoCodes – GMC – B123E GMC

B123E GMC Code - Radio Keypad Button Signal Circuit

Quick Answer

The radio controls communicate radio control inputs directly to the radio through a discrete circuit for volume up, volume down, and power button. Common causes include Faulty Radio Controls, Radio Controls harness is open or shorted, Radio Controls 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: B123E GMC indicates Radio Keypad Button Signal Circuit.
Common causes: Common causes include Faulty Radio Controls, Radio Controls harness is open or shorted, Radio Controls 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 214

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 12, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B123E GMC Description

The radio controls communicate radio control inputs directly to the radio through a discrete circuit for volume up, volume down, and power button. It also uses a series of resistors through a signal circuit when the home, seek up, seek down and phone buttons are pressed. After receiving the message, the radio will perform the requested function. Messages communicated between the radio and the radio controls include the following: Button presses/knob rotations, Commands for the state of indicators, and Controls back-lighting. The Diagnostic Trouble Code (DTC) will be set when the radio detects an open/high resistance, short to voltage, or short to ground on the radio controls key signal circuit.

OBDII Code B123E GMC - Radio Keypad Button Signal Circuit - AutoCodes.com — B123E GMC Code - Radio Keypad Button Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B123E GMC?

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

How to Fix the DTC B123E 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 B123E 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.

Need more information about the B123E GMC code?

Need more information on how to fix the B123E GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B123E GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

B123E 2014 GMC Sierra — Radio Keypad Button Signal Circuit
B123E 2015 GMC Sierra — Radio Keypad Button Signal Circuit
B123E 2016 GMC Sierra — Radio Keypad Button Signal Circuit
B123E 2017 GMC Sierra — Radio Keypad Button Signal Circuit
B123E 2018 GMC Sierra — Radio Keypad Button Signal Circuit

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 B123E GMC Code

1. What are common symptoms of OBDII code B123E GMC related to the Radio Keypad Button Signal Circuit?

The common symptoms include non-functioning radio buttons on the keypad, unresponsive controls, or erratic behavior of the radio system.

2. What are the possible causes of OBDII code B123E GMC?

The code B123E GMC can be caused by issues such as a faulty radio keypad, damaged wiring in the signal circuit, or a malfunctioning control module.

3. How can I diagnose the Radio Keypad Button Signal Circuit issue causing OBDII code B123E GMC?

Diagnosing the problem involves checking the connections to the keypad, testing the wiring for continuity, and inspecting the control module for any visible damage.

4. Are there any DIY repair tips for fixing OBDII code B123E GMC?

DIY repair tips include checking for loose connections, replacing damaged wiring, or resetting the control module to see if the issue resolves.

5. Can a malfunctioning radio keypad affect other vehicle systems?

Yes, a malfunctioning radio keypad can potentially affect other vehicle systems that rely on the same control module or signal circuit.

6. Is it safe to continue driving with OBDII code B123E GMC triggered?

It is generally safe to continue driving with this code, but it is recommended to address the issue promptly to avoid any inconvenience with the radio system.

7. How much does it typically cost to repair OBDII code B123E GMC related to the Radio Keypad Button Signal Circuit?

The cost of repair can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can I reset the OBDII code B123E GMC myself after fixing the issue?

Yes, you can reset the code using an OBDII scanner or by disconnecting the car battery for a few minutes to clear the error code.

9. Are there any recalls or technical service bulletins related to OBDII code B123E GMC?

It is recommended to check with a GMC dealership or online resources to see if there are any recalls or technical bulletins related to this specific OBDII code.

10. How can I prevent OBDII code B123E GMC from occurring in the future?

Regularly inspecting and maintaining the radio system, avoiding water damage to the keypad, and addressing any electrical issues promptly can help prevent the recurrence of this OBDII code.