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Engine-Codes – GMC – B2622 GMC

B2622 GMC Code - Display Dimming Pulse Width Modulation Input Circuit

Quick Answer

The B2622 GMC code refers to an issue with the Display Dimming Pulse Width Modulation Input Circuit. Common causes include Faulty dimmer switch or control module, Wiring or connection issues in the display dimming circuit, Defective display panel or instrument cluster. 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
B2622 GMC indicates Display Dimming Pulse Width Modulation Input Circuit.
Common causes
Common causes include Faulty dimmer switch or control module, Wiring or connection issues in the display dimming circuit, Defective display panel or instrument cluster.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B2622 GMC Description

The B2622 GMC code refers to an issue with the Display Dimming Pulse Width Modulation Input Circuit. In modern vehicles, the display dimming system uses pulse width modulation (PWM) to control the brightness of various displays and indicators in the vehicle, such as the instrument cluster, infotainment screen, and climate control panel. This code indicates that there is a problem with the input circuit that controls the dimming function, which can lead to issues with the visibility of the displays and potentially affect the driver's ability to read important information while driving.

OBDII Code B2622 GMC - Display Dimming Pulse Width Modulation Input Circuit
B2622 GMC Code - Display Dimming Pulse Width Modulation Input Circuit

Common Causes of B2622 GMC

  1. Faulty dimmer switch or control module.
  2. Wiring or connection issues in the display dimming circuit.
  3. Defective display panel or instrument cluster.
  4. Malfunctioning ambient light sensor that regulates display brightness.
  5. Electrical system issues such as a blown fuse or bad relay.

Symptoms of B2622 GMC

  1. Dim or flickering displays on the instrument cluster or infotainment screen.
  2. Inconsistent brightness levels that do not respond to adjustments.
  3. Complete failure of the displays to illuminate.
  4. Difficulty reading information on the displays, especially in low-light conditions.
  5. Warning messages related to display brightness or electrical issues.

How to Fix B2622 GMC

  1. Diagnose the root cause of the issue by testing the dimmer switch, control module, wiring, and display components.
  2. Repair or replace any faulty components identified during the diagnostic process.
  3. Reset the display dimming system and recalibrate the brightness settings as needed.
  4. Test the system to ensure that the displays respond correctly to adjustments and maintain consistent brightness levels.
  5. Clear the diagnostic trouble codes from the vehicle's system to verify that the issue has been resolved.

Cost to Fix B2622 GMC

The typical repair costs for addressing the B2622 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, you can expect to pay anywhere from $150 to $500 for parts and labor to fix problems related to the display dimming pulse width modulation input circuit. Keep in mind that the actual cost may be higher or lower based on factors such as the vehicle's make and model, the location of the repair shop, and the complexity of the repair process. It's recommended to obtain quotes from multiple auto repair shops to compare prices and ensure that you are getting a fair estimate for the necessary repairs.

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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 B2622 GMC Code

1. What does the OBDII code B2622 mean on a GMC vehicle?

B2622 indicates an issue with the Display Dimming Pulse Width Modulation (PWM) Input Circuit, which controls the dimming of interior displays and lights.

2. What are common symptoms of the B2622 code?

Symptoms include non-functional or inconsistent dimming of interior displays, overly bright or dim dashboard lights, and possible flickering.

3. What causes the B2622 code to appear?

Common causes include a faulty dimmer switch, wiring issues such as open or shorted circuits, a malfunctioning Body Control Module (BCM), or a defective display panel.

4. Can I drive my GMC with the B2622 code?

Yes, the vehicle is typically still drivable, but the code may result in inconvenient lighting issues that could be distracting, especially at night.

5. How is the B2622 code diagnosed?

A technician will inspect the dimmer switch, wiring, and connectors for damage, use a scan tool to monitor the PWM signal, and check the BCM for faults.

6. How do you fix the B2622 code on a GMC vehicle?

Repairs may involve replacing the dimmer switch, repairing damaged wiring or connectors, reprogramming or replacing the BCM, or addressing any related electrical issues.

7. What tools are needed to troubleshoot the B2622 code?

A diagnostic scan tool, multimeter, and wiring diagrams for the vehicle are typically required to pinpoint the issue.

8. Is the B2622 code covered under warranty?

This depends on the vehicle’s age, mileage, and warranty terms. Check with your dealership for specific coverage details.

9. Can a dead battery cause the B2622 code?

A low or dead battery can sometimes trigger electrical codes, including B2622, due to voltage irregularities affecting the dimming circuit.

10. How much does it cost to fix the B2622 code?

Repair costs vary depending on the specific issue but typically range from $100 to $500, depending on whether parts like the dimmer switch or BCM need replacement.

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