AutoCodes – GMC – B2623 GMC

B2623 GMC Code - Display Dimming Pulse Width Modulation Input Circuit

Quick Answer

The Body Control Module (BCM) receives a variable voltage signal from the Instrument Panel (I/P) Dimmer Switch requesting to illuminate the I/P controls illumination lamps to a desired intensity. Common causes include Faulty Instrument Panel (I/P) Dimmer Switch, Instrument Panel (I/P) Dimmer Switch harness is open or shorted, Instrument Panel (I/P) Dimmer Switch 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: B2623 GMC indicates Display Dimming Pulse Width Modulation Input Circuit.
Common causes: Common causes include Faulty Instrument Panel (I/P) Dimmer Switch, Instrument Panel (I/P) Dimmer Switch harness is open or shorted, Instrument Panel (I/P) Dimmer Switch 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 700

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 Jan 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2623 GMC Description

The Body Control Module (BCM) receives a variable voltage signal from the Instrument Panel (I/P) Dimmer Switch requesting to illuminate the I/P controls illumination lamps to a desired intensity. When this occurs, the BCM directly sends a variable voltage based on the I/P dimmer switch position through the I/P lamps supply voltage circuit to the I/P controls illumination lamps.

OBDII Code B2623 GMC - Display Dimming Pulse Width Modulation Input Circuit - AutoCodes.com — B2623 GMC Code - Display Dimming Pulse Width Modulation Input Circuit

What does this mean?

What are the Possible Causes of the DTC B2623 GMC?

Faulty Instrument Panel (I/P) Dimmer Switch
Instrument Panel (I/P) Dimmer Switch harness is open or shorted
Instrument Panel (I/P) Dimmer Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2623 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 B2623 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 B2623 GMC Code

1. What are the common symptoms of OBDII code B2623 GMC (Display Dimming Pulse Width Modulation Input Circuit)?

The common symptoms include dim or flickering dashboard display lights, erratic gauge behavior, and issues with the brightness control.

2. What are the potential causes of OBDII code B2623 GMC?

The code B2623 GMC is typically caused by a faulty display dimming pulse width modulation input circuit, loose wiring connections, or a malfunctioning dimmer switch.

3. How can I diagnose the Display Dimming Pulse Width Modulation Input Circuit issue?

Diagnosing the issue involves checking the wiring connections, inspecting the dimmer switch for proper functionality, and using a multimeter to test the voltage output of the circuit.

4. Can a DIY enthusiast repair OBDII code B2623 GMC?

If the issue is related to loose connections or a faulty dimmer switch, it may be possible for a DIY enthusiast to repair the problem. However, complex electronic issues may require professional assistance.

5. How can I prevent OBDII code B2623 GMC from occurring in the future?

To prevent the code from occurring, regularly inspect the wiring connections, avoid overloading the electrical system, and promptly address any dashboard display issues.

6. Is it safe to continue driving with OBDII code B2623 GMC present?

While the vehicle may still be operable with the code present, it is recommended to address the issue promptly to avoid potential electrical malfunctions or safety hazards while driving.

7. How much does it typically cost to repair OBDII code B2623 GMC?

The cost of repairing the Display Dimming Pulse Width Modulation Input Circuit issue can vary depending on the underlying cause, but it may range from $100 to $300 including parts and labor.

8. Can a faulty dimmer switch cause OBDII code B2623 GMC?

Yes, a faulty dimmer switch can cause the code B2623 GMC to trigger due to issues with the pulse width modulation input circuit's control of the display brightness.

9. Are there any specific models of GMC vehicles prone to experiencing OBDII code B2623?

While the code B2623 GMC can potentially occur in various models, certain vehicles with more complex electrical systems or older dimmer switches may be more susceptible to this issue.

10. What are the long-term consequences of ignoring OBDII code B2623 GMC?

Ignoring the code B2623 GMC can lead to continued display dimming issues, potential electrical system malfunctions, and reduced visibility of critical dashboard information while driving.