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Engine-Codes – Scion – B2020 Scion

B2020 Scion Code - Open In Left Side Upper MOS

Quick Answer

The B2020 diagnostic trouble code for Scion vehicles indicates an open circuit in the left side upper MOS (Metal Oxide Semiconductor) of the vehicle. Common causes include Corrosion or damage to wiring harness, Faulty MOSFET component, Poor electrical connections. 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
B2020 Scion indicates Open In Left Side Upper MOS.
Common causes
Common causes include Corrosion or damage to wiring harness, Faulty MOSFET component, Poor electrical connections.
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 Sep 13, 2024
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Code B2020 Scion Description

The B2020 diagnostic trouble code for Scion vehicles indicates an open circuit in the left side upper MOS (Metal Oxide Semiconductor) of the vehicle. MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) are electronic components used in various systems within the vehicle, such as the engine control module, transmission control module, or other electronic control units. An open circuit in the left side upper MOS can disrupt the flow of electrical signals, leading to malfunctions in the affected system.

OBDII Code B2020 Scion - Open In Left Side Upper MOS
B2020 Scion Code - Open In Left Side Upper MOS

Common Causes of B2020 Scion

  1. Corrosion or damage to wiring harness
  2. Faulty MOSFET component
  3. Poor electrical connections
  4. Water intrusion into the electrical system
  5. Manufacturing defect in the MOSFET component

Symptoms of B2020 Scion

  1. Engine misfires
  2. Transmission shifting issues
  3. Loss of power
  4. Check engine light illuminated
  5. Vehicle stalling

How to Fix B2020 Scion

  1. Begin by conducting a thorough inspection of the wiring harness and connectors associated with the left side upper MOS.
  2. Test the MOSFET component for continuity and proper functionality.
  3. Repair or replace any damaged wiring or connectors.
  4. If the MOSFET component is faulty, replace it with a new one.
  5. Clear the diagnostic trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix B2020 Scion

The cost of repairing an open circuit in the left side upper MOS can vary depending on the specific cause of the issue and the labor rates in your area. In general, the parts required for this repair may range from $50 to $200, while labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue could fall between $150 and $500. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on your vehicle's make and model, as well as the extent of the repair needed. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may differ based on location and shop type.

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B2020 Scion Code

1. What are the common symptoms of an OBDII code B2020 in a Scion related to an open in the left side upper MOS?

- Common symptoms include malfunctioning power windows, power door locks, or other electrical components on the left side of the vehicle.

2. What does the OBDII code B2020 indicating an open in the left side upper MOS in a Scion mean?

- This code indicates that there is an open circuit in the left side upper Metal Oxide Semiconductor (MOS) component of the vehicle's electrical system.

3. What are the possible causes of an open in the left side upper MOS triggering the OBDII code B2020 in a Scion?

- Causes can include damaged wiring, loose connections, faulty MOS unit, or corrosion in the electrical system on the left side of the vehicle.

4. How can I diagnose the issue causing the OBDII code B2020 related to an open in the left side upper MOS in my Scion?

- Use a multimeter to check for continuity in the wiring, inspect the connections and the MOS unit, and look for any visible signs of damage or corrosion.

5. What are the recommended repair tips for addressing the OBDII code B2020 linked to an open in the left side upper MOS in a Scion?

- Repair or replace any damaged wiring, secure loose connections, replace the faulty MOS unit if necessary, and ensure proper corrosion protection in the affected area.

6. Can driving with an unresolved OBDII code B2020 indicating an open in the left side upper MOS in a Scion cause further damage?

- Continuing to drive with this issue may lead to further electrical problems on the left side of the vehicle and potentially affect other systems connected to it.

7. Is it safe to reset the OBDII code B2020 related to an open in the left side upper MOS in my Scion without fixing the underlying issue?

- It is not recommended to reset the code without addressing the root cause, as the problem will persist and could worsen over time.

8. How much can I expect to pay for professional repairs for an OBDII code B2020 associated with an open in the left side upper MOS in a Scion?

- The cost of repairs can vary depending on the extent of the damage and the specific components that need attention, but it is advisable to consult a mechanic for an accurate estimate.

9. Are there any preventive measures I can take to avoid encountering the OBDII code B2020 due to an open in the left side upper MOS in my Scion in the future?

- Regularly inspecting and maintaining the electrical system, addressing any wiring issues promptly, and avoiding water exposure can help prevent this problem from occurring.

10. Can I fix an open circuit causing the OBDII code B2020 related to the left side upper MOS issue in my Scion myself, or should I seek professional help?

- While some DIY enthusiasts may be able to address simple wiring issues, it is recommended to consult a professional mechanic for proper diagnosis and repair of complex electrical problems like this one.

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