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Engine-Codes – Generic – B1D20

B1D20 Code - Mirror Vertical Motor Control Circuit High

Quick Answer

The B1D20 diagnostic trouble code (DTC) indicates a fault in the vertical motor control circuit of the vehicle's mirror system. Common causes include Faulty vertical motor within the mirror assembly, Damaged or frayed wiring in the mirror control circuit, Poor electrical connections or corrosion at the connector points. 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
B1D20 indicates Mirror Vertical Motor Control Circuit High.
Common causes
Common causes include Faulty vertical motor within the mirror assembly, Damaged or frayed wiring in the mirror control circuit, Poor electrical connections or corrosion at the connector points.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 23, 2024
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Code B1D20 Description

The B1D20 diagnostic trouble code (DTC) indicates a fault in the vertical motor control circuit of the vehicle's mirror system. This code is typically triggered when the powertrain control module (PCM) detects an abnormal voltage level in the mirror's vertical motor circuit, suggesting that the circuit is drawing too much current or is shorted. The vertical motor is responsible for adjusting the mirror's angle up and down, allowing the driver to achieve optimal visibility.

OBDII Code B1D20 - Mirror Vertical Motor Control Circuit High
B1D20 Code - Mirror Vertical Motor Control Circuit High

Common Causes of B1D20

  1. Faulty vertical motor within the mirror assembly.
  2. Damaged or frayed wiring in the mirror control circuit.
  3. Poor electrical connections or corrosion at the connector points.
  4. A malfunctioning control module that regulates the mirror adjustments.
  5. Short circuit due to moisture intrusion or physical damage to the mirror assembly.

Symptoms of B1D20

  1. Inability to adjust the side mirror vertically.
  2. Intermittent or complete failure of the mirror adjustment feature.
  3. Unusual noises (such as grinding or clicking) when attempting to adjust the mirror.
  4. Warning lights or messages on the dashboard related to the mirror system.
  5. Increased resistance or sluggishness in mirror movement when attempting to adjust.

How to Fix B1D20

  1. Diagnostic Testing: Begin by using an OBD-II scanner to confirm the presence of the B1D20 code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the mirror assembly, wiring harness, and connectors for signs of damage, corrosion, or loose connections. Repair or replace any damaged components as necessary.
  3. Motor Testing: Test the vertical motor for functionality using a multimeter to check for proper voltage and resistance. If the motor is faulty, replace it.
  4. Wiring Repair: If damaged wiring is found, repair or replace the affected sections to ensure proper electrical flow.
  5. Control Module Check: If all other components are functioning correctly, test the control module for faults. Reprogram or replace the module if necessary.

Cost to Fix B1D20

The typical cost to repair the B1D20 code can range from $150 to $600, depending on the specific issue identified during diagnosis. This estimate includes parts such as the vertical motor, wiring, and connectors, as well as labor costs. Labor rates can vary significantly based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

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Code B1D20 Information for Specific Makes

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 B1D20 Code

1. What does the OBDII code B1D20 mean?

B1D20 indicates an issue with the mirror vertical motor control circuit, specifically that the circuit voltage is higher than expected.

2. What are the common symptoms of code B1D20?

Symptoms include the side mirror not adjusting vertically, unresponsive mirror controls, or intermittent mirror movement.

3. What causes the B1D20 code to appear?

Common causes include a faulty mirror vertical motor, damaged wiring, a short circuit, or a malfunctioning mirror control switch.

4. Can I still drive with the B1D20 code active?

Yes, you can still drive, but your mirrors may not adjust properly, which could affect visibility and safety.

5. How do I diagnose the B1D20 code?

Diagnose by inspecting the wiring and connectors for damage, testing the mirror vertical motor for proper function, and checking the mirror control switch.

6. How can I fix the B1D20 code?

Repairs may involve replacing the mirror vertical motor, repairing damaged wiring, or replacing the mirror control switch if it’s faulty.

7. Can a blown fuse cause the B1D20 code?

While unlikely, a blown fuse related to the mirror system could contribute to the issue and should be checked.

8. How much does it cost to repair the B1D20 code?

Repair costs vary depending on the issue but typically range from $50 to $300, depending on whether parts like the motor or switch need replacement.

9. Can I reset the B1D20 code without repairs?

You can clear the code with an OBDII scanner, but it will likely return if the underlying issue is not addressed.

10. Is the B1D20 code vehicle-specific?

Yes, the exact meaning and troubleshooting steps can vary between manufacturers, so refer to your vehicle’s service manual for specifics.

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