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Engine-Codes – GMC – P18C0 2016 GMC Sierra

P18C0 2016 GMC Sierra Code - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range

Quick Answer

The P18C0 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Internal Mode Switch 'B' Circuit is stuck in an invalid voltage range. Common causes include Faulty Internal Mode Switch sensor, Damaged wiring or connectors in the circuit, Malfunctioning Transmission 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
P18C0 2016 GMC Sierra indicates Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range.
Common causes
Common causes include Faulty Internal Mode Switch sensor, Damaged wiring or connectors in the circuit, Malfunctioning Transmission 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 10, 2024
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Code P18C0 2016 GMC Sierra Description

The P18C0 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Internal Mode Switch 'B' Circuit is stuck in an invalid voltage range. The Internal Mode Switch (IMS) is a vital component of the transmission control system that helps the vehicle's onboard computer determine the desired gear selection based on driver input. In this case, the circuit related to the IMS 'B' has encountered a voltage range issue, which can disrupt the proper communication between the transmission control module (TCM) and the IMS.

OBDII Code P18C0 2016 GMC Sierra - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range
P18C0 2016 GMC Sierra Code - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range

Common Causes of P18C0 2016 GMC Sierra

  1. Faulty Internal Mode Switch sensor
  2. Damaged wiring or connectors in the circuit
  3. Malfunctioning Transmission Control Module
  4. Corrosion or contamination in the circuit
  5. Electrical issues such as a short circuit or open circuit

Symptoms of P18C0 2016 GMC Sierra

  1. Erratic shifting behavior
  2. Delayed gear engagement
  3. Harsh shifting
  4. Transmission slippage
  5. Illumination of the check engine light

How to Fix P18C0 2016 GMC Sierra

  1. Perform a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the issue with the IMS 'B' Circuit.
  2. Inspect the wiring and connectors related to the IMS 'B' Circuit for any signs of damage or corrosion.
  3. Test the Internal Mode Switch sensor for proper functionality and replace if necessary.
  4. Clear the trouble codes and reset the TCM to ensure proper communication with the IMS.
  5. Test drive the vehicle to verify that the issue has been resolved and that the transmission is functioning correctly.

Cost to Fix P18C0 2016 GMC Sierra

The typical repair costs for addressing the P18C0 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Generally, the cost of parts for replacing the IMS sensor or repairing damaged wiring can range from $100 to $300. Labor costs can add an additional $100 to $300, with total repair costs averaging between $200 and $600. It is important to note that labor rates can vary significantly based on location, vehicle make and model, and the expertise of the technician performing the repair. It is advisable to obtain quotes from multiple auto repair shops to ensure a competitive price for the repair.

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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 P18C0 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P18C0 in a 2016 GMC Sierra?

The common symptoms of code P18C0 include issues with shifting gears, the inability to start the vehicle, and the check engine light illuminating on the dashboard.

2. What does the OBDII code P18C0 'Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range' mean for a 2016 GMC Sierra?

This code indicates a problem with the internal mode switch 'B' circuit in the transmission range sensor, causing it to be stuck in an invalid voltage range.

3. What are the possible causes of OBDII code P18C0 in a 2016 GMC Sierra?

Possible causes of code P18C0 include a faulty internal mode switch, damaged wiring or connectors in the circuit, low transmission fluid levels, or internal transmission issues.

4. How can I diagnose and repair OBDII code P18C0 on my 2016 GMC Sierra?

Diagnosing and repairing code P18C0 typically involves checking the internal mode switch for proper operation, inspecting the wiring and connectors for damage, ensuring the transmission fluid levels are adequate, and addressing any internal transmission problems.

5. Can I continue driving my 2016 GMC Sierra with OBDII code P18C0 present?

It is not recommended to drive your vehicle with code P18C0 present, as it can lead to further damage to the transmission and other components. It is best to have the issue diagnosed and repaired as soon as possible.

6. Will resetting the OBDII code P18C0 in my 2016 GMC Sierra make it go away permanently?

Simply resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code P18C0 is not addressed, the code is likely to return.

7. Is it safe to attempt to repair OBDII code P18C0 in a 2016 GMC Sierra on my own?

Repairing code P18C0 may require specialized knowledge and tools related to the transmission system. It is recommended to seek assistance from a qualified mechanic or technician to properly diagnose and repair the issue.

8. How much does it typically cost to repair OBDII code P18C0 on a 2016 GMC Sierra?

The cost of repairing code P18C0 can vary depending on the root cause of the issue, labor rates, and parts needed. It is advisable to obtain quotes from different repair shops to get an accurate estimate.

9. Can extreme weather conditions or rough driving cause OBDII code P18C0 to trigger in a 2016 GMC Sierra?

While extreme conditions may not directly cause code P18C0, they can exacerbate existing issues within the transmission system. It is important to maintain your vehicle and address any potential problems promptly to prevent codes like P18C0 from occurring.

10. How can I prevent OBDII code P18C0 from appearing in my 2016 GMC Sierra in the future?

Regular maintenance of your vehicle, including checking transmission fluid levels, inspecting wiring and connectors for damage, and addressing any issues promptly, can help prevent code P18C0 and other related transmission problems from occurring.

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