AutoCodes – GMC – P182B 2018 GMC Sierra

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

Quick Answer

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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: P182B 2018 GMC Sierra indicates Internal Mode Switch 'B' Circuit Low Voltage.
Common causes: Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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.

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Code Popularity 210

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P182B 2018 GMC Sierra Description

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied with a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70–0.96 V indicating On or 1.68–2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool. The Diagnostic Trouble Code (DTC) will be set when the TCM has detected the internal mode switch B signal circuit voltage is less than 0.7 V, for 1.75 s.

OBDII Code P182B 2018 GMC Sierra - Internal Mode Switch 'B' Circuit Low Voltage - AutoCodes.com — P182B 2018 GMC Sierra Code - Internal Mode Switch 'B' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P182B 2018 GMC Sierra?

Faulty Transmission Internal Mode Switch
Transmission Internal Mode Switch harness is open or shorted
Transmission Internal Mode Switch circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P182B 2018 GMC Sierra?

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 P182B 2018 GMC Sierra 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.

Need more information about the P182B 2018 GMC Sierra code?

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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.