Engine-Codes.com
Engine-Codes – Chevrolet – P18C3 2017 Chevrolet Silverado

P18C3 2017 Chevrolet Silverado Code - Internal Mode Switch 'S' Circuit Stuck On Invalid Voltage Range

Quick Answer

The P18C3 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado refers to the Internal Mode Switch 'S' Circuit being stuck on an invalid voltage range. Common causes include Faulty internal mode switch, Damaged wiring or connectors in the IMS circuit, Issues with the 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
P18C3 2017 Chevrolet Silverado indicates Internal Mode Switch 'S' Circuit Stuck On Invalid Voltage Range.
Common causes
Common causes include Faulty internal mode switch, Damaged wiring or connectors in the IMS circuit, Issues with the 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 15, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P18C3 2017 Chevrolet Silverado Description

The P18C3 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado refers to the Internal Mode Switch 'S' Circuit being stuck on an invalid voltage range. The internal mode switch (IMS) is a component of the transmission range sensor that communicates with the transmission control module (TCM) to determine the gear selection of the vehicle. When the IMS 'S' circuit is stuck on an invalid voltage range, it means that the voltage signal being sent by the IMS is outside of the acceptable range, leading to potential issues in gear selection and transmission operation.

OBDII Code P18C3 2017 Chevrolet Silverado - Internal Mode Switch 'S' Circuit Stuck On Invalid Voltage Range
P18C3 2017 Chevrolet Silverado Code - Internal Mode Switch 'S' Circuit Stuck On Invalid Voltage Range

Common Causes of P18C3 2017 Chevrolet Silverado

  1. Faulty internal mode switch
  2. Damaged wiring or connectors in the IMS circuit
  3. Issues with the transmission control module
  4. Corrosion or moisture in the IMS circuit
  5. Electrical issues in the transmission system

Symptoms of P18C3 2017 Chevrolet Silverado

  1. Erratic shifting patterns
  2. Difficulty in selecting gears
  3. Transmission slipping
  4. Vehicle stuck in a single gear
  5. Limp mode activation

How to Fix P18C3 2017 Chevrolet Silverado

  1. Diagnose the P18C3 code using a scan tool to verify the voltage range issue.
  2. Inspect the internal mode switch and its circuit for any visible damage or corrosion.
  3. Test the wiring and connectors in the IMS circuit for continuity and proper voltage.
  4. Replace the internal mode switch if it is found to be faulty.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P18C3 2017 Chevrolet Silverado

The typical repair costs for addressing the P18C3 code on a 2017 Chevrolet Silverado can vary depending on the exact cause of the issue. In general, the cost of replacing the internal mode switch and addressing any wiring or connector issues can range from $200 to $500, including parts and labor. It is important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your specific circumstances.

Need more information about the P18C3 2017 Chevrolet Silverado code?

Need more information on how to fix the P18C3 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P18C3 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P18C3 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18C3 on a 2017 Chevrolet Silverado?

The common symptoms of code P18C3 include issues with shifting gears, erratic transmission behavior, and the malfunction indicator light (MIL) illuminating on the dashboard.

2. What could cause the Internal Mode Switch 'S' Circuit to be stuck on an invalid voltage range in a 2017 Chevrolet Silverado?

Possible causes of code P18C3 include a faulty internal mode switch, damaged wiring or connectors related to the switch, or issues with the transmission control module (TCM).

3. How can I diagnose OBDII code P18C3 on my 2017 Chevrolet Silverado?

Diagnosing code P18C3 involves using a diagnostic scan tool to retrieve the trouble codes, inspecting the internal mode switch and its connections, and checking for any visible signs of damage or corrosion.

4. Is it safe to continue driving my 2017 Chevrolet Silverado with OBDII code P18C3?

It is not recommended to drive your vehicle with code P18C3, as it can lead to transmission issues and potentially cause further damage. It's best to address the problem promptly.

5. What are some tips for repairing OBDII code P18C3 on a 2017 Chevrolet Silverado?

Repairing code P18C3 may involve replacing the internal mode switch, repairing or replacing damaged wiring or connectors, and clearing the trouble codes with a diagnostic tool after the repair is completed.

6. Can a DIY enthusiast fix OBDII code P18C3 on a 2017 Chevrolet Silverado?

While some experienced DIY enthusiasts may be able to address code P18C3 themselves, it's recommended to have a professional mechanic diagnose and repair the issue to ensure it is properly resolved.

7. How much does it typically cost to repair OBDII code P18C3 on a 2017 Chevrolet Silverado?

The cost of repairing code P18C3 can vary depending on the exact cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It's advisable to obtain quotes from local mechanics for an accurate estimate.

8. Will resetting the trouble codes make OBDII code P18C3 go away on a 2017 Chevrolet Silverado?

Simply resetting the trouble codes may temporarily clear the MIL, but if the underlying issue causing code P18C3 is not addressed, the code is likely to reappear once the problem is detected again.

9. How urgent is it to address OBDII code P18C3 on a 2017 Chevrolet Silverado?

It is important to address code P18C3 promptly to prevent potential transmission issues and ensure the proper functioning of your vehicle. Ignoring the code could lead to further damage and safety concerns.

10. Can OBDII code P18C3 on a 2017 Chevrolet Silverado cause permanent damage if left unattended?

Continuing to drive with code P18C3 unresolved can potentially cause damage to the transmission or other related components over time. Therefore, it's crucial to address the issue as soon as possible to avoid costly repairs.

Discuss the causes and fixes for P18C3 2017 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P18C3 2017 Chevrolet Silverado comments

No comments found for this page.