AutoCodes – Chevrolet – P18C0 2014 Chevrolet Silverado

P18C0 2014 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 2014 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 244

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 2014 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 2014 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range - AutoCodes.com — P18C0 2014 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 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P18C0 2014 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 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18C0 in a 2014 Chevrolet Silverado?

- Common symptoms include issues with the gear shifting, the vehicle not starting, or 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 2014 Chevrolet Silverado?

- This code indicates that there is a problem with the internal mode switch B circuit in the transmission range sensor of the vehicle.

3. What are the possible causes of OBDII code P18C0 in a 2014 Chevrolet Silverado?

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

4. How can I diagnose the OBDII code P18C0 in my 2014 Chevrolet Silverado?

- Diagnosis involves using a scan tool to retrieve the trouble codes, inspecting the internal mode switch and its circuit for any visible damage, and testing the voltage range of the switch.

5. What are the repair options for fixing OBDII code P18C0 in a 2014 Chevrolet Silverado?

- Repairs may involve replacing the internal mode switch, repairing or replacing damaged wiring or connectors, or reprogramming the transmission control module.

6. Is it safe to continue driving my 2014 Chevrolet Silverado with OBDII code P18C0 present?

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

7. Can I reset the OBDII code P18C0 in my 2014 Chevrolet Silverado by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. How much does it typically cost to repair OBDII code P18C0 in a 2014 Chevrolet Silverado?

- The cost of repairs can vary depending on the specific cause of the code, but it may range from $200 to $500 or more, including parts and labor.

9. Are there any preventive maintenance steps I can take to avoid OBDII code P18C0 in my 2014 Chevrolet Silverado?

- Regularly checking and maintaining the transmission system, including the internal mode switch and its circuit, can help prevent issues that may trigger this code.

10. Will OBDII code P18C0 cause my 2014 Chevrolet Silverado to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test as it indicates a problem with the transmission system, which can impact the vehicle's overall performance and emissions output.