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P182B 2018 GMC Sierra Code - Internal Mode Switch 'B' Circuit Low Voltage

Quick Answer

The P182B diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Internal Mode Switch 'B' Circuit Low Voltage. Common causes include Faulty Internal Mode Switch sensor, Damaged wiring or connectors in the IMS circuit, Issues with the transmission control module (TCM). 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
P182B 2018 GMC Sierra indicates Internal Mode Switch 'B' Circuit Low Voltage.
Common causes
Common causes include Faulty Internal Mode Switch sensor, Damaged wiring or connectors in the IMS circuit, Issues with the transmission control module (TCM).
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 17, 2024
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Code P182B 2018 GMC Sierra Description

The P182B diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Internal Mode Switch 'B' Circuit Low Voltage. The Internal Mode Switch (IMS) is a component within the transmission control module (TCM) that helps the TCM determine the current gear selection of the vehicle. In this case, the 'B' circuit is reporting a voltage that is lower than expected, which can lead to various performance issues.

OBDII Code P182B 2018 GMC Sierra - Internal Mode Switch 'B' Circuit Low Voltage
P182B 2018 GMC Sierra Code - Internal Mode Switch 'B' Circuit Low Voltage

Common Causes of P182B 2018 GMC Sierra

  1. Faulty Internal Mode Switch sensor
  2. Damaged wiring or connectors in the IMS circuit
  3. Issues with the transmission control module (TCM)
  4. Corrosion or moisture in the circuit
  5. Electrical issues within the transmission system

Symptoms of P182B 2018 GMC Sierra

  1. Erratic or harsh shifting
  2. Delayed engagement when shifting gears
  3. Transmission not shifting at all
  4. Poor acceleration
  5. Decreased fuel efficiency

How to Fix P182B 2018 GMC Sierra

  1. Perform a thorough inspection of the IMS 'B' circuit, including the sensor, wiring, and connectors.
  2. Test the voltage output of the IMS sensor to determine if it is within the specified range.
  3. Replace the IMS sensor if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors in the circuit.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P182B 2018 GMC Sierra

The typical repair costs for addressing the Internal Mode Switch 'B' Circuit Low Voltage issue can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the cost of replacing the IMS sensor and repairing any damaged wiring or connectors can range from $200 to $500. However, it's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Additionally, the cost of parts can also impact the overall repair bill. It's recommended to obtain a detailed estimate from a qualified mechanic to get a more accurate cost assessment based on your specific vehicle and location.

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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 P182B 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P182B in a 2018 GMC Sierra?

- Common symptoms include issues with shifting gears, hesitation or jerking when accelerating, and the transmission not shifting properly.

2. What can cause the Internal Mode Switch 'B' Circuit Low Voltage code (P182B) in a 2018 GMC Sierra?

- The code P182B can be caused by a faulty internal mode switch, damaged wiring or connectors, or a malfunctioning transmission control module.

3. How serious is the Internal Mode Switch 'B' Circuit Low Voltage code (P182B) in a 2018 GMC Sierra?

- This code can affect the proper functioning of the transmission, potentially leading to drivability issues and safety concerns. It is advisable to address this issue promptly.

4. Can I continue driving my 2018 GMC Sierra with OBDII code P182B present?

- It is not recommended to continue driving the vehicle with this code present, as it could lead to further transmission problems and potentially cause more damage.

5. How do I diagnose OBDII code P182B in my 2018 GMC Sierra?

- Diagnosing this code typically involves using a scan tool to retrieve the code, checking the internal mode switch for proper operation, inspecting wiring and connectors for damage, and testing the transmission control module.

6. What are the repair options for fixing OBDII code P182B in a 2018 GMC Sierra?

- Repair options may include replacing the internal mode switch, repairing or replacing damaged wiring or connectors, and reprogramming or replacing the transmission control module if necessary.

7. Can I reset the OBDII code P182B in my 2018 GMC Sierra without fixing the underlying issue?

- While you can clear the code using a scan tool, it is important to address the underlying problem causing the code to prevent further transmission issues.

8. How much does it cost to fix OBDII code P182B in a 2018 GMC Sierra?

- The cost of fixing this code can vary depending on the exact cause of the issue, the parts needed for repair, and the labor rates of the repair shop. It is recommended to get a diagnosis and estimate from a qualified mechanic.

9. Are there any DIY solutions for resolving OBDII code P182B in a 2018 GMC Sierra?

- DIY solutions for this code may be limited, as it often requires specialized tools and expertise to diagnose and repair transmission-related issues. It is best to consult a professional mechanic for proper diagnosis and repair.

10. How can I prevent OBDII code P182B from occurring in my 2018 GMC Sierra in the future?

- To prevent the reoccurrence of this code, it is essential to maintain your vehicle regularly, address any transmission issues promptly, and follow the manufacturer's recommended maintenance schedule.

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