AutoCodes – Generic – B2150

B2150 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 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 13,261

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

What does this mean?

What are the Possible Causes of the DTC B2150?

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?

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 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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Information for Specific Makes

B2150 Acura — Communication Bus Line Error
B2150 Buick — Outside Rearview Mirror Position Sensor Input Voltage Low
B2150 Cadillac — Outside Rearview Mirror Position Sensor Input Voltage Low
B2150 Chevrolet — Outside Rearview Mirror Position Sensor Input Voltage Low
B2150 GMC — Outside Rearview Mirror Position Sensor Input Voltage Low
B2150 Honda — Communication Bus Line Error

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 Code

1. What are the common symptoms of OBDII code B2150?

The common symptoms of OBDII code B2150 include malfunctioning or erratic movement of the outside rearview mirrors and an illuminated check engine light.

2. What causes the OBDII code B2150 to trigger?

The OBDII code B2150 is triggered when the outside rearview mirror position sensor input voltage is detected to be low, indicating a potential issue with the sensor or its wiring.

3. How can I diagnose the cause of OBDII code B2150?

Diagnosing the cause of OBDII code B2150 involves checking the wiring and connections of the outside rearview mirror position sensor, testing the sensor itself for proper functionality, and inspecting for any damage or corrosion.

4. Can a faulty outside rearview mirror position sensor be repaired?

In some cases, a faulty outside rearview mirror position sensor may be repairable by cleaning the sensor or repairing/replacing any damaged wiring. However, in most cases, it may be more cost-effective to replace the sensor altogether.

5. Is it safe to continue driving with OBDII code B2150 present?

While the vehicle may still be operable with OBDII code B2150, it is recommended to address the issue promptly to ensure proper functioning of the outside rearview mirrors and to prevent any further electrical problems.

6. How much does it typically cost to repair OBDII code B2150?

The cost to repair OBDII code B2150 can vary depending on the underlying cause of the issue, the extent of the repairs needed, and the labor rates of the repair shop. It is advisable to obtain quotes from different mechanics or dealerships for an accurate estimate.

7. Can OBDII code B2150 be reset without fixing the underlying issue?

Resetting OBDII code B2150 without addressing the underlying issue will only temporarily clear the code. The check engine light is likely to reappear if the root cause of the problem is not resolved.

8. Are there any DIY repair tips for OBDII code B2150?

DIY repair tips for OBDII code B2150 include checking the sensor wiring for any visible damage, testing the sensor using a multimeter, and ensuring all connections are secure and free of corrosion.

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

The repair time for OBDII code B2150 can vary depending on the complexity of the issue and the availability of parts. Simple repairs may take a few hours, while more involved repairs may require a day or more.

10. Can extreme weather conditions affect OBDII code B2150?

Extreme weather conditions such as heavy rain or extreme cold can potentially affect the outside rearview mirror position sensor and trigger OBDII code B2150. It is important to keep the sensor and its connections protected from such conditions.