AutoCodes – Chevrolet – P18C2 2016 Chevrolet Silverado

P18C2 2016 Chevrolet Silverado Code - Internal Mode Switch 'P' 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: P18C2 2016 Chevrolet Silverado indicates Internal Mode Switch 'P' 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.

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Code Popularity 242

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 P18C2 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 P signal circuit has an invalid voltage range of 0.70 – 0.96 V for 2.7 s.

OBDII Code P18C2 2016 Chevrolet Silverado - Internal Mode Switch 'P' Circuit Stuck On Invalid Voltage Range - AutoCodes.com — P18C2 2016 Chevrolet Silverado Code - Internal Mode Switch 'P' Circuit Stuck On Invalid Voltage Range

What does this mean?

What are the Possible Causes of the DTC P18C2 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 P18C2 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 P18C2 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 P18C2 2016 Chevrolet Silverado code?

Need more information on how to fix the P18C2 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P18C2 2016 Chevrolet Silverado Code

1. What does OBDII code P18C2 mean for my 2016 Chevrolet Silverado?

- This code indicates a problem with the Internal Mode Switch 'P' circuit being stuck on an invalid voltage range.

2. What are the common symptoms of OBDII code P18C2 in a 2016 Chevrolet Silverado?

- Common symptoms may include issues with shifting gears, the transmission not engaging properly, or the vehicle going into limp mode.

3. What are the possible causes of OBDII code P18C2 in a 2016 Chevrolet Silverado?

- Potential causes include a faulty internal mode switch, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

4. How can I diagnose the Internal Mode Switch 'P' circuit issue in my 2016 Chevrolet Silverado?

- You can use a diagnostic scanner to read the OBDII code, perform a visual inspection of wiring and connectors, and test the internal mode switch for proper operation.

5. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P18C2?

- It is not recommended to continue driving with this code present, as it can lead to further transmission issues and potential safety hazards.

6. How can I repair OBDII code P18C2 in my 2016 Chevrolet Silverado?

- Repair options may include replacing the internal mode switch, repairing damaged wiring or connectors, checking and refilling transmission fluid, or reprogramming the transmission control module.

7. Will resetting the OBDII code P18C2 in my 2016 Chevrolet Silverado fix the issue?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the Internal Mode Switch 'P' circuit issue.

8. How much does it typically cost to repair OBDII code P18C2 in a 2016 Chevrolet Silverado?

- The cost of repair can vary depending on the specific issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P18C2 in a 2016 Chevrolet Silverado?

- While some basic troubleshooting can be done by DIY enthusiasts, diagnosing and repairing this code may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

10. Is OBDII code P18C2 a common issue in 2016 Chevrolet Silverado vehicles?

- While not extremely common, this code can occur in 2016 Chevrolet Silverado trucks due to various factors such as wear and tear, electrical issues, or component failures.