AutoCodes – GMC – B2148 GMC

B2148 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: B2148 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 494

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 B2148 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 B2148 GMC - Outside Rearview Mirror Position Sensor Input Voltage Low - AutoCodes.com — B2148 GMC Code - Outside Rearview Mirror Position Sensor Input Voltage Low

What does this mean?

What are the Possible Causes of the DTC B2148 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 B2148 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 B2148 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 B2148 GMC Code

1. What are the common symptoms of OBDII code B2148 GMC (Outside Rearview Mirror Position Sensor Input Voltage Low)?

- Common symptoms include erratic movement of the outside rearview mirror, failure of the mirror to adjust properly, and the mirror not responding to control inputs.

2. What are the possible causes of OBDII code B2148 GMC?

- Possible causes include a faulty outside rearview mirror position sensor, damaged wiring or connectors in the mirror system, or a problem with the mirror control module.

3. How can I diagnose OBDII code B2148 GMC?

- Diagnosis typically involves inspecting the wiring and connectors in the mirror system, testing the mirror position sensor for proper functionality, and checking the mirror control module for any faults.

4. Can I continue driving with OBDII code B2148 GMC present?

- It is generally safe to drive with this code, but you may experience issues with mirror adjustment and positioning until the problem is resolved.

5. How can I repair OBDII code B2148 GMC?

- Repair options may include replacing the faulty mirror position sensor, repairing damaged wiring or connectors, or reprogramming the mirror control module.

6. Are there any DIY tips for fixing OBDII code B2148 GMC?

- DIY tips may include checking and cleaning the mirror connectors, ensuring proper power supply to the mirror system, and following manufacturer-specific diagnostic procedures.

7. Will resetting the OBDII system clear code B2148 GMC?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear upon driving.

8. How much does it cost to repair OBDII code B2148 GMC?

- The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can extreme weather conditions trigger OBDII code B2148 GMC?

- Extreme weather conditions, such as heavy rain or extreme cold, can sometimes affect the operation of the outside rearview mirror system and potentially trigger this code.

10. Is it necessary to visit a mechanic for OBDII code B2148 GMC, or can I fix it myself?

- While some DIY repairs may be possible, it is recommended to consult with a qualified mechanic or technician for a proper diagnosis and repair of OBDII code B2148 GMC to ensure the issue is resolved correctly.