AutoCodes – Chevrolet – B2622 Chevrolet

B2622 Chevrolet 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: B2622 Chevrolet 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 4,987

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 B2622 Chevrolet 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 B2622 Chevrolet - Display Dimming Pulse Width Modulation Input Circuit - AutoCodes.com — B2622 Chevrolet Code - Display Dimming Pulse Width Modulation Input Circuit

What does this mean?

What are the Possible Causes of the DTC B2622 Chevrolet?

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 B2622 Chevrolet?

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 B2622 Chevrolet 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 B2622 Chevrolet Code

1. What does the OBDII code B2622 mean for a Chevrolet?

B2622 indicates an issue with the Display Dimming Pulse Width Modulation Input Circuit, which controls the dimming of dashboard displays based on ambient lighting or user settings.

2. What are common symptoms of code B2622 in a Chevrolet?

Symptoms include malfunctioning dashboard lighting, displays stuck at a constant brightness level, or flickering lights.

3. What causes code B2622 to appear in a Chevrolet?

Common causes include a faulty dimming control module, damaged wiring or connectors in the circuit, or a defective light sensor.

4. Can I drive my Chevrolet with code B2622 active?

Yes, you can drive the vehicle, but dashboard displays may not adjust brightness correctly, potentially affecting visibility in certain lighting conditions.

5. How do you diagnose code B2622 in a Chevrolet?

Diagnosis involves inspecting the dimming circuit wiring, testing the control module, and checking for faults in the ambient light sensor.

6. How do you fix code B2622 in a Chevrolet?

Repairs may include replacing damaged wiring, connectors, or the dimming control module, and ensuring the light sensor is functioning correctly.

7. Is code B2622 specific to Chevrolet vehicles?

No, code B2622 can appear in other vehicles with similar dimming control systems, but its troubleshooting and repair may vary by make and model.

8. Does code B2622 affect other vehicle functions?

No, this code typically affects the display dimming system only and does not impact critical vehicle functions like engine performance or safety systems.

9. How much does it cost to repair code B2622 in a Chevrolet?

Repair costs depend on the specific issue but can range from $50 to $300, with higher costs if the dimming control module needs replacement.

10. Can I prevent code B2622 from occurring in my Chevrolet?

Regular inspection of wiring and connectors, avoiding moisture exposure, and ensuring the dashboard lighting system is maintained can help prevent this code.