B2146 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
- B2146 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.
Code B2146 GMC Description
What are the Possible Causes of the DTC B2146 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 B2146 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 B2146 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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Frequently Asked Questions about B2146 GMC Code
1. What does the OBDII code B2146 mean on a GMC vehicle?
B2146 indicates that the input voltage from the outside rearview mirror position sensor is lower than the expected range.
2. What are the common symptoms of the B2146 code in a GMC?
Symptoms may include malfunctioning or unresponsive power mirrors, a check engine light, or issues with memory seat and mirror settings.
3. What causes the B2146 code to appear on a GMC?
Common causes include a faulty mirror position sensor, damaged wiring or connections, or a malfunctioning power mirror control module.
4. Can the B2146 code affect the operation of other features in the vehicle?
Yes, it can interfere with memory settings for mirrors and seats, especially on models with advanced memory systems.
5. How do I diagnose the B2146 code on my GMC?
Start by checking the wiring and connections to the mirror position sensor for damage or corrosion. Then, test the sensor for proper voltage and functionality.
6. Can I still drive my GMC with the B2146 code active?
Yes, you can still drive the vehicle, but you may lose functionality of certain features like power mirrors or memory settings.
7. What tools are needed to fix the B2146 code on a GMC?
You’ll need a multimeter to test voltage, an OBDII scanner to clear the code, and possibly a replacement sensor or wiring repair tools.
8. How much does it cost to repair the B2146 code on a GMC?
The cost varies but typically ranges from $50 to $200, depending on whether the issue is a simple wiring fix or requires a new sensor/module.
9. Can the B2146 code be caused by a software issue?
While rare, a software glitch in the power mirror control module could trigger this code and may require reprogramming.
10. How can I prevent the B2146 code from recurring on my GMC?
Regularly inspect and maintain the wiring and connectors for the mirror position sensors to prevent corrosion or damage.
Discuss the causes and fixes for B2146 GMC OBDII Code
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