AutoCodes – GMC – B2228 GMC

B2228 GMC Code - Mirror Left Switch Fault

Quick Answer

The driver door switch signal circuits provide inputs to the Driver Door Module (DDM) when the mirror switch is activated. Common causes include Faulty Mirror Left Switch, Mirror Left Switch harness is open or shorted, Mirror Left 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: B2228 GMC indicates Mirror Left Switch Fault.
Common causes: Common causes include Faulty Mirror Left Switch, Mirror Left Switch harness is open or shorted, Mirror Left 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 577

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 Oct 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2228 GMC Description

The driver door switch signal circuits provide inputs to the Driver Door Module (DDM) when the mirror switch is activated. These inputs allow the DDM to detect a mirror direction request. The DDM provides both power and ground to the mirror switches. When a mirror switch is activated to the right, left, up or down position, ground is supplied through the mirror switch to the signal circuit, which is pulled low. When the DDM detects low voltage on the signal circuit, it will command the mirror to rotate in the direction selected. The DDM controls passenger mirror functions by sending mirror control messages to the Passenger Door Module (PDM) on the serial data line and the PDM then commands the passenger mirror. The DDM monitors both the driver and passenger mirror switch signal circuits to determine how long a ground has been applied. If the DDM detects that a ground is applied for greater than 20 seconds, a Diagnostic Trouble Code (DTC) is set.

OBDII Code B2228 GMC - Mirror Left Switch Fault - AutoCodes.com — B2228 GMC Code - Mirror Left Switch Fault

What does this mean?

What are the Possible Causes of the DTC B2228 GMC?

Faulty Mirror Left Switch
Mirror Left Switch harness is open or shorted
Mirror Left Switch circuit poor electrical connection
Faulty Driver Door Module (DDM)

How to Fix the DTC B2228 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 B2228 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 B2228 GMC Code

1. What are the common symptoms of OBDII code B2228 GMC (Mirror Left Switch Fault)?

The common symptoms include non-functional or erratic operation of the left mirror switch, inability to adjust the left side mirror, and potential issues with other mirror functions.

2. What are the possible causes of OBDII code B2228 GMC?

Possible causes of this code include a faulty left mirror switch, damaged wiring or connectors related to the left mirror switch, or a malfunctioning mirror control module.

3. How can I diagnose the Mirror Left Switch Fault code B2228 in my GMC vehicle?

Diagnosing this code typically involves checking the electrical connections to the left mirror switch, testing the switch itself for proper functionality, and inspecting the mirror control module for any issues.

4. Can a DIY enthusiast repair OBDII code B2228 GMC at home?

Depending on your level of automotive expertise, you may be able to replace the left mirror switch or repair damaged wiring at home. However, complex electrical diagnostics or module replacements may require professional assistance.

5. Should I be concerned about driving my GMC with the Mirror Left Switch Fault code B2228?

While the code may not affect the drivability of your vehicle, it is important to address the issue to ensure proper functionality of your mirror adjustments and other related systems.

6. Is it possible to reset the OBDII code B2228 GMC without fixing the underlying issue?

Resetting the code without addressing the root cause, such as a faulty switch or wiring, may temporarily clear the error code but will likely result in the code reappearing once the issue persists.

7. How much does it typically cost to repair OBDII code B2228 GMC at a dealership or repair shop?

The cost of repairing this code can vary depending on the specific cause and required repairs. It is recommended to obtain quotes from different service providers for an accurate estimate.

8. Can a faulty mirror control module cause OBDII code B2228 GMC to appear?

Yes, a malfunctioning mirror control module can trigger the Mirror Left Switch Fault code B2228 in your GMC vehicle, indicating a problem with the left mirror switch operation.

9. Are there any preventive measures to avoid encountering OBDII code B2228 GMC in the future?

Regularly checking and maintaining the electrical components related to your mirror switches, such as keeping connectors clean and ensuring proper wiring integrity, can help prevent issues that lead to this fault code.

10. Will fixing OBDII code B2228 GMC require specialized tools or equipment?

Repairing this code may require basic electrical diagnostic tools, such as a multimeter, and potentially specialized tools for accessing and replacing components within the mirror switch system.