AutoCodes – GMC – B123E 2018 GMC Sierra

B123E 2018 GMC Sierra 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 Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B123E 2018 GMC Sierra 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: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 170

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B123E 2018 GMC Sierra 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 2018 GMC Sierra - Radio Keypad Button Signal Circuit - AutoCodes.com — B123E 2018 GMC Sierra Code - Radio Keypad Button Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B123E 2018 GMC Sierra?

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

How to Fix the DTC B123E 2018 GMC Sierra?

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 2018 GMC Sierra 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 2018 GMC Sierra code?

Need more information on how to fix the B123E 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 B123E 2018 GMC Sierra Code

1. What does the OBDII code B123E mean on a 2018 GMC Sierra?

The B123E code indicates an issue with the Radio Keypad Button Signal Circuit, which involves a malfunction in the communication or operation of the keypad buttons for the radio system.

2. What are common symptoms of the B123E code?

Common symptoms include non-responsive radio keypad buttons, intermittent functionality, or no input being registered when pressing the buttons.

3. What causes the B123E code to appear on a 2018 GMC Sierra?

The code can be caused by a faulty radio keypad, damaged wiring in the button signal circuit, a loose connector, or a failing radio control module.

4. How can I diagnose the B123E code?

Start by checking the keypad buttons for physical damage, inspect the wiring and connectors for corrosion or disconnection, and use a diagnostic scanner to confirm the fault code and related data.

5. Can the B123E code affect other vehicle functions?

Generally, this code only impacts the functionality of the radio keypad and should not interfere with other vehicle systems.

6. How do I fix the B123E code on my 2018 GMC Sierra?

Repairs may involve replacing the faulty keypad, repairing or replacing damaged wiring, securing loose connectors, or reprogramming or replacing the radio control module.

7. Is the B123E code a serious issue?

While it does not affect vehicle safety or drivability, it can be inconvenient as it limits the use of the radio system.

8. Can I clear the B123E code without fixing the issue?

Clearing the code with a scanner may provide temporary relief, but if the underlying issue is not resolved, the code will likely return.

9. How much does it cost to repair the B123E code?

Repair costs vary depending on the issue, ranging from $50 for minor wiring repairs to $400 or more for keypad or module replacement.

10. Can I continue driving with the B123E code active?

Yes, you can continue driving, but the radio keypad functionality may remain limited until the issue is resolved.

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