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P182A 2018 GMC Sierra Code - Internal Mode Switch 'A' Circuit Low Voltage

Quick Answer

The P182A diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Internal Mode Switch 'A' Circuit Low Voltage. Common causes include Faulty Internal Mode Switch, Damaged wiring or connectors in the IMS circuit, Low transmission fluid level. 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
P182A 2018 GMC Sierra indicates Internal Mode Switch 'A' Circuit Low Voltage.
Common causes
Common causes include Faulty Internal Mode Switch, Damaged wiring or connectors in the IMS circuit, Low transmission fluid level.
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 16, 2024
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Code P182A 2018 GMC Sierra Description

The P182A diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Internal Mode Switch 'A' Circuit Low Voltage. The Internal Mode Switch (IMS) is a component within the transmission control module that helps the vehicle's computer determine the current gear selection. When the IMS 'A' circuit is reporting low voltage, it means that the signal being sent by the IMS is weaker than expected, which can lead to incorrect gear selection, erratic shifting, and potential transmission issues.

OBDII Code P182A 2018 GMC Sierra - Internal Mode Switch 'A' Circuit Low Voltage
P182A 2018 GMC Sierra Code - Internal Mode Switch 'A' Circuit Low Voltage

Common Causes of P182A 2018 GMC Sierra

  1. Faulty Internal Mode Switch
  2. Damaged wiring or connectors in the IMS circuit
  3. Low transmission fluid level
  4. Issues with the transmission control module
  5. Electrical problems within the transmission system

Symptoms of P182A 2018 GMC Sierra

  1. Harsh or delayed shifting
  2. Incorrect gear selection displayed on the dashboard
  3. Transmission slipping
  4. Loss of power or acceleration
  5. Illumination of the Check Engine Light

How to Fix P182A 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the Internal Mode Switch and its circuitry to identify any visible damage or issues.
  2. Test the voltage output of the IMS to determine if it is within the specified range. If the voltage is low, the IMS may need to be replaced.
  3. Check the wiring and connectors in the IMS circuit for any signs of damage or corrosion. Repair or replace as necessary.
  4. Ensure that the transmission fluid level is adequate and top up if needed. Low fluid levels can affect the performance of the transmission.
  5. If the issue persists after these steps, consider consulting a professional mechanic or dealership for further diagnosis and repair.

Cost to Fix P182A 2018 GMC Sierra

The cost of repairing a P182A code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing the Internal Mode Switch or repairing wiring/connectors can cost between $200 and $500, including parts and labor. Additional costs may apply if further diagnosis or repairs are required. It's important to note that 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 P182A 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P182A in a 2018 GMC Sierra?

- Common symptoms include issues with shifting gears, difficulty engaging reverse, and potentially triggering the vehicle to go into limp mode.

2. What does the Internal Mode Switch 'A' Circuit Low Voltage mean for a 2018 GMC Sierra?

- This code indicates that there is a low voltage condition in the circuit related to the internal mode switch 'A', which can impact the transmission's operation.

3. What are the possible causes of the Internal Mode Switch 'A' Circuit Low Voltage code in a 2018 GMC Sierra?

- Potential causes include a faulty internal mode switch, damaged wiring or connectors in the circuit, low battery voltage, or issues with the transmission control module.

4. How can I diagnose OBDII code P182A in my 2018 GMC Sierra?

- Diagnosis typically involves using a scan tool to read the code, checking the internal mode switch and related wiring for damage, and testing the voltage in the circuit.

5. Can I continue driving my 2018 GMC Sierra with the Internal Mode Switch 'A' Circuit Low Voltage code?

- It is not recommended to drive the vehicle with this code present, as it can lead to transmission issues and further damage if not addressed promptly.

6. How can I repair OBDII code P182A in my 2018 GMC Sierra?

- Repairs may involve replacing the internal mode switch, repairing damaged wiring or connectors, addressing low battery voltage issues, or reprogramming the transmission control module.

7. Is it necessary to reset the OBDII code P182A after repairs in a 2018 GMC Sierra?

- Yes, it is important to clear the code after completing repairs to see if the issue has been resolved and to prevent potential confusion in future diagnostics.

8. Are there any DIY tips for addressing the Internal Mode Switch 'A' Circuit Low Voltage code in a 2018 GMC Sierra?

- While some basic checks like inspecting wiring and connectors can be done DIY, complex repairs or component replacements may require professional help.

9. Can weather conditions affect the occurrence of OBDII code P182A in a 2018 GMC Sierra?

- Extreme weather conditions, especially those impacting electrical components, can potentially contribute to issues leading to the Internal Mode Switch 'A' Circuit Low Voltage code.

10. How long does it typically take to repair OBDII code P182A in a 2018 GMC Sierra?

- The repair time can vary based on the exact cause of the issue and the complexity of the repair needed, but it may take a few hours to a day to complete the necessary fixes.

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