AutoCodesChevrolet – P18C0 2016 Chevrolet Silverado

P18C0 2016 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range

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
P18C0 2016 Chevrolet Silverado indicates Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range.
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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 214
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Mar 23, 2024
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Code P18C0 2016 Chevrolet Silverado 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 has an invalid voltage range of 0.70 – 0.96 V for 2.7 s.
OBDII Code P18C0 2016 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range - AutoCodes.com
P18C0 2016 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range

What are the Possible Causes of the DTC P18C0 2016 Chevrolet Silverado?

  • 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 P18C0 2016 Chevrolet Silverado?

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 P18C0 2016 Chevrolet Silverado 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 P18C0 2016 Chevrolet Silverado code?

Need more information on how to fix the P18C0 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P18C0 2016 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 P18C0 2016 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P18C0 in a 2016 Chevrolet Silverado?

Common symptoms include difficulty shifting gears, erratic shifting behavior, illuminated check engine light, and potential stalling issues.

2. What causes the Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range in a 2016 Chevrolet Silverado?

This code can be triggered by a faulty internal mode switch, damaged wiring or connectors, issues with the transmission control module, or a malfunctioning PCM.

3. How can I diagnose the Internal Mode Switch 'B' Circuit issue in my 2016 Chevrolet Silverado?

Diagnosis typically involves using a scan tool to retrieve the OBDII code, checking the internal mode switch for proper operation, inspecting wiring for damage, and testing the voltage range.

4. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P18C0 present?

It is not recommended to continue driving with this code present, as it can lead to further transmission issues and potential safety concerns. It's best to address the problem promptly.

5. Is it possible to reset the OBDII code P18C0 in a 2016 Chevrolet Silverado without fixing the underlying issue?

While you can clear the code with a scan tool, it will likely reappear if the root cause is not addressed. Resetting the code without fixing the problem will not resolve the issue.

6. What are the repair options for fixing the Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range in a 2016 Chevrolet Silverado?

Repair options include replacing the internal mode switch, repairing damaged wiring or connectors, reprogramming the transmission control module, or addressing any PCM issues.

7. Can a DIY enthusiast fix the OBDII code P18C0 issue in a 2016 Chevrolet Silverado?

Depending on the cause of the problem, some DIY enthusiasts with experience in automotive repair may be able to tackle this issue. However, it's recommended to consult a professional technician for accurate diagnosis and repair.

8. How much does it typically cost to repair OBDII code P18C0 in a 2016 Chevrolet Silverado?

The cost of repair can vary significantly depending on the underlying issue, labor rates, and parts needed. It's advisable to obtain quotes from reputable repair shops for an accurate estimate.

9. Can weather or environmental factors trigger the Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range in a 2016 Chevrolet Silverado?

While it's less common, extreme weather conditions or environmental factors can potentially contribute to electrical issues that may trigger this code. Ensuring proper vehicle maintenance can help prevent such issues.

10. Are there any preventive measures to avoid encountering OBDII code P18C0 in a 2016 Chevrolet Silverado?

Regularly servicing your vehicle, checking for any signs of wear or damage in the transmission system, and addressing any electrical issues promptly can help prevent the occurrence of this code.

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