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Engine-Codes – GMC – B2120 GMC

B2120 GMC Code - Power Seat Position Sensor Voltage

Quick Answer

The B2120 GMC code indicates a problem with the power seat position sensor voltage in a GMC vehicle. Common causes include Faulty power seat position sensor, Damaged wiring or connectors, Malfunctioning power seat control module. 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
B2120 GMC indicates Power Seat Position Sensor Voltage.
Common causes
Common causes include Faulty power seat position sensor, Damaged wiring or connectors, Malfunctioning power seat control module.
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 B2120 GMC Description

The B2120 GMC code indicates a problem with the power seat position sensor voltage in a GMC vehicle. This sensor is responsible for detecting the position of the power seat and sending voltage signals to the vehicle's computer system. When this code is triggered, it means that the voltage readings from the sensor are outside of the expected range, indicating a potential issue with the sensor or its wiring.

OBDII Code B2120 GMC - Power Seat Position Sensor Voltage
B2120 GMC Code - Power Seat Position Sensor Voltage

Common Causes of B2120 GMC

  1. Faulty power seat position sensor.
  2. Damaged wiring or connectors.
  3. Malfunctioning power seat control module.
  4. Issues with the vehicle's computer system.

Symptoms of B2120 GMC

  1. Power seat not moving or responding to controls.
  2. Power seat moving erratically or unpredictably.
  3. Power seat getting stuck in one position.
  4. Warning light illuminated on the dashboard.

How to Fix B2120 GMC

  1. Begin by performing a thorough inspection of the power seat position sensor, wiring, and connectors to check for any visible damage or loose connections.
  2. Use a multimeter to test the voltage output of the sensor and compare it to the manufacturer's specifications to determine if it is within the acceptable range.
  3. If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  4. Check and repair any damaged wiring or connectors as needed.
  5. Clear the diagnostic trouble codes from the vehicle's computer system and test the power seat to ensure it is functioning properly.

Cost to Fix B2120 GMC

The typical repair costs for addressing a B2120 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a power seat position sensor can cost between $100 and $300, including parts and labor. Additional costs may apply if there are other components that need to be repaired or replaced. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 B2120 GMC Code

1. What are the common symptoms of OBDII code B2120 GMC related to the power seat position sensor voltage issue?

- Common symptoms include erratic seat movement, failure of the power seat to adjust properly, and warning lights on the dashboard.

2. What are the possible causes of OBDII code B2120 GMC indicating a power seat position sensor voltage problem?

- The main causes could be a faulty power seat position sensor, damaged wiring or connectors, or a malfunctioning power seat control module.

3. How can I diagnose the source of the power seat position sensor voltage problem indicated by OBDII code B2120 GMC?

- To diagnose the issue, you can use a diagnostic scanner to retrieve the specific trouble codes, inspect the wiring and connectors for any visible damage, and test the power seat position sensor for proper functionality.

4. Is it safe to continue driving my vehicle with OBDII code B2120 GMC triggered by the power seat position sensor voltage issue?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the problem promptly to avoid any inconvenience or potential safety concerns related to the power seat function.

5. Can I repair the power seat position sensor voltage problem associated with OBDII code B2120 GMC by myself?

- If you have experience with automotive electrical systems and access to the necessary tools, you may be able to repair the issue yourself by replacing the faulty sensor or repairing any damaged wiring.

6. What are some tips for repairing the power seat position sensor voltage problem causing OBDII code B2120 GMC?

- Ensure you have the correct replacement part, follow the manufacturer's instructions for sensor replacement, and carefully inspect all related components for any additional issues.

7. How much does it typically cost to repair the power seat position sensor voltage problem indicated by OBDII code B2120 GMC at a professional auto repair shop?

- The cost can vary depending on the extent of the damage and the rates of the repair shop, but it may range from $100 to $300 for parts and labor.

8. Can resetting the OBDII system clear the B2120 GMC trouble code related to the power seat position sensor voltage issue?

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

9. Are there any preventive measures to avoid encountering OBDII code B2120 GMC due to power seat position sensor voltage problems in the future?

- Regularly inspecting the power seat components for signs of wear or damage, avoiding excessive force when adjusting the seat, and addressing any related issues promptly can help prevent this problem.

10. Will the power seat position sensor voltage problem indicated by OBDII code B2120 GMC affect the overall drivability of the vehicle?

- While the issue may not directly impact the drivability of the vehicle, it can affect the convenience and comfort of adjusting the power seat, which may be important for driver comfort and safety.

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