AutoCodes – GMC – B2150 GMC

B2150 GMC Code - Outside Rearview Mirror Position Sensor Input Voltage Low

Quick Answer

The Memory Mirror Module (MMM) receives input from mirror position sensors during these functions: memory recall, memory seat, and easy exit. Common causes include Faulty Outside Rearview Mirror Motor, Outside Rearview Mirror Motor harness is open or shorted, Outside Rearview Mirror Motor 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: B2150 GMC indicates Outside Rearview Mirror Position Sensor Input Voltage Low.
Common causes: Common causes include Faulty Outside Rearview Mirror Motor, Outside Rearview Mirror Motor harness is open or shorted, Outside Rearview Mirror Motor 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 491

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 Sep 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2150 GMC Description

The Memory Mirror Module (MMM) receives input from mirror position sensors during these functions: memory recall, memory seat, and easy exit. Potentiometers in position sensors vary in resistance as motors move outside rearview mirror. MMM receives a variable voltage input depending on resistance of the potentiometer. During memory set, MMM records voltages across outside rearview mirrors. During memory recall, MMM moves outside rearview mirror motor until the voltage across each potentiometer matches recorded the voltage. During normal operation, mirror position sensors are checked against out-of-range limits. Outside rearview mirrors horizontal or vertical position sensor input voltage is less than 0.25 volts.

OBDII Code B2150 GMC - Outside Rearview Mirror Position Sensor Input Voltage Low - AutoCodes.com — B2150 GMC Code - Outside Rearview Mirror Position Sensor Input Voltage Low

What does this mean?

What are the Possible Causes of the DTC B2150 GMC?

Faulty Outside Rearview Mirror Motor
Outside Rearview Mirror Motor harness is open or shorted
Outside Rearview Mirror Motor circuit poor electrical connection
Faulty Memory Mirror Module (MMM)

How to Fix the DTC B2150 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 B2150 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 B2150 GMC Code

1. What are common symptoms of OBDII code B2150 GMC (Outside Rearview Mirror Position Sensor Input Voltage Low)?

The common symptoms include malfunctioning power mirrors, erratic mirror movement, and the mirror position not adjusting properly.

2. What are the possible causes of OBDII code B2150 GMC?

Possible causes include faulty mirror position sensor, damaged wiring or connectors in the mirror system, low voltage supply to the sensor, or a malfunction in the mirror control module.

3. How can I diagnose the OBDII code B2150 GMC?

Diagnosis involves visually inspecting the mirror system for any visible damage, testing the voltage supply to the sensor, checking for loose or damaged wiring, and using a scan tool to retrieve the trouble codes and data related to the mirror system.

4. Can I still drive my vehicle with OBDII code B2150 GMC?

It is not recommended to drive the vehicle with this code as it can affect the functionality of the mirrors, which are important for safe driving and visibility.

5. How can I repair OBDII code B2150 GMC?

Repair involves fixing or replacing the faulty mirror position sensor, repairing any damaged wiring or connectors, ensuring proper voltage supply to the sensor, and resetting the trouble code with a scan tool after the repairs are completed.

6. Are there any DIY tips for fixing OBDII code B2150 GMC?

DIY tips include checking for loose connections in the mirror system, inspecting the fuse related to the mirrors, and testing the voltage supply to the sensor using a multimeter.

7. Is it necessary to replace the entire mirror assembly for OBDII code B2150 GMC?

In most cases, only the faulty components like the sensor or wiring need to be replaced, rather than the entire mirror assembly, unless the damage is extensive.

8. Can extreme weather conditions cause OBDII code B2150 GMC to trigger?

Yes, extreme weather conditions like excessive heat or cold can sometimes affect the sensor's performance and trigger the low voltage input code.

9. How long does it typically take to repair OBDII code B2150 GMC?

The repair time can vary depending on the extent of the damage and the availability of replacement parts, but it can usually be fixed within a few hours to a day.

10. Is it necessary to clear the trouble code after repairing OBDII code B2150 GMC?

Yes, it is important to clear the trouble code using a scan tool after completing the repairs to reset the system and ensure proper functionality of the mirror position sensor.