AutoCodes – Chevrolet – P18C0 2017 Chevrolet Silverado

P18C0 2017 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 2017 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.

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Code Popularity 267

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 P18C0 2017 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 2017 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range - AutoCodes.com — P18C0 2017 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range

What does this mean?

What are the Possible Causes of the DTC P18C0 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P18C0 2017 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 P18C0 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18C0 in a 2017 Chevrolet Silverado?

- Common symptoms include issues with shifting gears, transmission not responding properly, and the vehicle going into "limp mode."

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

- Possible causes may include a faulty internal mode switch, damaged wiring or connectors, or issues with the transmission control module.

3. How serious is the Internal Mode Switch 'B' Circuit stuck on invalid voltage range issue in a 2017 Chevrolet Silverado?

- This issue can significantly affect the performance and drivability of the vehicle, potentially leading to transmission problems and safety concerns if not addressed promptly.

4. Can I continue driving my 2017 Chevrolet Silverado with the Internal Mode Switch 'B' Circuit issue?

- It is not recommended to continue driving the vehicle as the problem can worsen over time, leading to more severe transmission issues and potential safety hazards.

5. How can I diagnose and repair OBDII code P18C0 in my 2017 Chevrolet Silverado?

- Diagnosis typically involves checking the internal mode switch's voltage readings, inspecting wiring for damage, and testing the transmission control module. Repairs may include replacing the internal mode switch or fixing any wiring/connectivity issues.

6. Will resetting the OBDII code P18C0 in my 2017 Chevrolet Silverado resolve the issue?

- Simply clearing the code may temporarily eliminate the warning light, but the underlying problem causing the code will persist until properly diagnosed and repaired.

7. How much does it cost to fix the Internal Mode Switch 'B' Circuit stuck on invalid voltage range in a 2017 Chevrolet Silverado?

- The cost of repairing this issue can vary depending on the root cause, parts needed, labor rates, and whether you choose to address the problem yourself or take it to a professional mechanic.

8. Are there any preventive measures to avoid OBDII code P18C0 in a 2017 Chevrolet Silverado?

- Regular maintenance, such as checking the transmission system, inspecting wiring harnesses, and addressing any warning signs promptly, can help prevent issues leading to this OBDII code.

9. Can a DIY enthusiast with basic automotive knowledge fix the Internal Mode Switch 'B' Circuit issue in a 2017 Chevrolet Silverado?

- Depending on the individual's skill level, diagnosing and repairing this issue may be possible for DIY enthusiasts with the necessary tools, resources, and technical understanding. However, complex transmission-related problems are often best handled by experienced professionals.

10. Will driving with the OBDII code P18C0 affect the fuel efficiency of my 2017 Chevrolet Silverado?

- The impact on fuel efficiency may vary, but unresolved transmission issues can lead to inefficient gear shifting and overall performance, potentially affecting fuel economy in the long run.