AutoCodes – Cadillac – B2147 Cadillac

B2147 Cadillac Code - Outside Rearview Mirror Position Sensor Input Voltage High

Quick Answer

The Memory Mirror Module (MMM) receives inputs 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: B2147 Cadillac indicates Outside Rearview Mirror Position Sensor Input Voltage High.
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 1,074

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 B2147 Cadillac Description

The Memory Mirror Module (MMM) receives inputs 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 voltage across mirrors. During memory recall, MMM moves mirror motors 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 and vertical position sensor input voltage is 4.75 volts or more.

OBDII Code B2147 Cadillac - Outside Rearview Mirror Position Sensor Input Voltage High - AutoCodes.com — B2147 Cadillac Code - Outside Rearview Mirror Position Sensor Input Voltage High

What does this mean?

What are the Possible Causes of the DTC B2147 Cadillac?

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 B2147 Cadillac?

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 B2147 Cadillac 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 B2147 Cadillac Code

1. What does the OBDII code B2147 mean on a Cadillac?

Code B2147 indicates that the input voltage from the outside rearview mirror position sensor is higher than the expected range.

2. What are the common symptoms of code B2147 on a Cadillac?

Symptoms may include the auto-dimming or memory function of the side mirror not working, mirror adjustment issues, or the mirror not returning to its programmed position.

3. What causes the B2147 code to appear on a Cadillac?

Common causes include a faulty mirror position sensor, damaged wiring or connectors, or an issue with the mirror control module.

4. Can a dirty or obstructed mirror cause the B2147 code?

No, dirt or obstructions on the mirror surface will not cause this code, as it relates specifically to the sensorâ€™s electrical signal.

5. How do I diagnose code B2147 on a Cadillac?

Start by inspecting the wiring and connectors around the mirror for damage or corrosion. Then test the mirror position sensor and control module for proper operation using a multimeter or scan tool.

6. Is the B2147 code related to the driverâ€™s or passengerâ€™s side mirror?

It depends on the specific vehicle. Check your service manual or diagnostic scan tool to determine which mirror is affected.

7. Can I drive my Cadillac with the B2147 code active?

Yes, you can drive the vehicle, but features like mirror memory or auto-dimming may not function correctly.

8. How is the B2147 code fixed on a Cadillac?

Repairs may include replacing a faulty mirror position sensor, repairing damaged wiring, or reprogramming the mirror control module if necessary.

9. Is clearing the B2147 code enough to fix the problem?

No, clearing the code without addressing the root cause will likely result in the code returning.

10. How much does it cost to repair the B2147 code on a Cadillac?

Repair costs vary but typically range from $100 to $500, depending on whether the issue requires sensor replacement, wiring repair, or module reprogramming.