AutoCodes – Chevrolet – P18B6 2014 Chevrolet Silverado

P18B6 2014 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Shorted

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: P18B6 2014 Chevrolet Silverado indicates Internal Mode Switch 'B' Circuit Shorted.
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 217

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 P18B6 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 voltage is between 0.966–1.68 V, for 1.75 s.

OBDII Code P18B6 2014 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Shorted - AutoCodes.com — P18B6 2014 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Shorted

What does this mean?

What are the Possible Causes of the DTC P18B6 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 P18B6 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 P18B6 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 P18B6 2014 Chevrolet Silverado code?

Need more information on how to fix the P18B6 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 P18B6 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18B6 in a 2014 Chevrolet Silverado?

- Symptoms may include issues with shifting gears, difficulty engaging gears, or the vehicle not starting.

2. What does the OBDII code P18B6 'Internal Mode Switch B Circuit Shorted' mean for a 2014 Chevrolet Silverado?

- This code indicates a potential short circuit in the internal mode switch B circuit, which is part of the transmission control system.

3. What are the possible causes of the Internal Mode Switch 'B' Circuit Shorted code in a 2014 Chevrolet Silverado?

- Causes can include a faulty internal mode switch, damaged wiring or connectors, or a malfunctioning transmission control module.

4. How can I diagnose the Internal Mode Switch 'B' Circuit Shorted issue in my 2014 Chevrolet Silverado?

- Diagnostic steps may involve checking the internal mode switch for proper operation, inspecting wiring for damage, and scanning the transmission control module for fault codes.

5. Is it safe to continue driving my 2014 Chevrolet Silverado with the P18B6 code present?

- It is not recommended to drive the vehicle with this code active, as it can lead to potential transmission issues and further damage.

6. Can I reset the OBDII code P18B6 in my 2014 Chevrolet Silverado without fixing the underlying issue?

- While you can clear the code temporarily, it will likely return until the root cause of the internal mode switch circuit short is addressed.

7. How much does it typically cost to repair the Internal Mode Switch 'B' Circuit Shorted problem in a 2014 Chevrolet Silverado?

- Repair costs can vary depending on the exact cause of the issue, but it may involve replacing the internal mode switch, repairing wiring, or reprogramming the transmission control module.

8. Are there any DIY repair tips for fixing the P18B6 code in a 2014 Chevrolet Silverado?

- DIY enthusiasts can start by inspecting wiring for damage, checking connectors for proper connection, and ensuring the internal mode switch is functioning correctly.

9. Will the Internal Mode Switch 'B' Circuit Shorted code cause any long-term damage to my 2014 Chevrolet Silverado if left unresolved?

- Ignoring this code can potentially lead to transmission issues and further damage over time, so it's best to address it promptly.

10. How long does it typically take to repair the Internal Mode Switch 'B' Circuit Shorted issue in a 2014 Chevrolet Silverado?

- Repair times can vary based on the specific cause of the problem, but it may take a few hours to a full day for diagnosis and repair by a professional mechanic.