AutoCodes – Chevrolet – P18C2 2014 Chevrolet Silverado

P18C2 2014 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 2014 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 218

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

OBDII Code P18C2 2014 Chevrolet Silverado - Internal Mode Switch 'P' Circuit Stuck On Invalid Voltage Range - AutoCodes.com — P18C2 2014 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 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 P18C2 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 P18C2 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 P18C2 2014 Chevrolet Silverado code?

Need more information on how to fix the P18C2 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 P18C2 2014 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P18C2 in a 2014 Chevrolet Silverado?

The common symptoms of OBDII code P18C2 in a 2014 Chevrolet Silverado include issues with shifting gears, hesitation or jerking when accelerating, and in some cases, the vehicle may not start.

2. What does the OBDII code P18C2 'Internal Mode Switch P Circuit Stuck On Invalid Voltage Range' mean for a 2014 Chevrolet Silverado?

The OBDII code P18C2 indicates that there is a problem with the internal mode switch 'P' circuit in a 2014 Chevrolet Silverado, specifically that it is stuck on an invalid voltage range.

3. What are possible causes of OBDII code P18C2 in a 2014 Chevrolet Silverado?

Possible causes of OBDII code P18C2 in a 2014 Chevrolet Silverado include a faulty internal mode switch, damaged wiring or connectors in the circuit, or issues with the transmission control module.

4. How serious is OBDII code P18C2 in a 2014 Chevrolet Silverado?

OBDII code P18C2 can cause drivability issues and potentially lead to transmission problems if not addressed promptly. It is recommended to address this issue as soon as possible to prevent further damage.

5. Can OBDII code P18C2 in a 2014 Chevrolet Silverado be fixed at home?

Depending on the cause of the code, some DIY enthusiasts may be able to fix OBDII code P18C2 at home by checking and repairing wiring connections or replacing the internal mode switch. However, diagnosing and repairing transmission-related issues may require professional assistance.

6. How can I diagnose OBDII code P18C2 in a 2014 Chevrolet Silverado?

Diagnosing OBDII code P18C2 in a 2014 Chevrolet Silverado typically involves using a scan tool to retrieve the code, checking the internal mode switch and its circuit for faults, and inspecting wiring connections for any damage.

7. What are the repair options for OBDII code P18C2 in a 2014 Chevrolet Silverado?

Repair options for OBDII code P18C2 in a 2014 Chevrolet Silverado may include replacing the internal mode switch, repairing damaged wiring or connectors, or resetting the transmission control module after fixing the underlying issue.

8. Are there any recalls or technical service bulletins related to OBDII code P18C2 in a 2014 Chevrolet Silverado?

It is recommended to check with a Chevrolet dealership or online resources for any recalls or technical service bulletins related to OBDII code P18C2 in a 2014 Chevrolet Silverado, as manufacturers may provide guidance or assistance for such issues.

9. Can driving with OBDII code P18C2 in a 2014 Chevrolet Silverado cause further damage?

Continued driving with OBDII code P18C2 in a 2014 Chevrolet Silverado can potentially cause further damage to the transmission or related components. It is advisable to address the issue promptly to prevent more extensive repairs.

10. How much does it cost to fix OBDII code P18C2 in a 2014 Chevrolet Silverado?

The cost of fixing OBDII code P18C2 in a 2014 Chevrolet Silverado can vary depending on the exact cause of the issue, parts needed for repair, and labor costs. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.