AutoCodes – Chevrolet – P18B6 2016 Chevrolet Silverado

P18B6 2016 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 2016 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 269

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 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 B signal circuit voltage is between 0.966–1.68 V, for 1.75 s.

OBDII Code P18B6 2016 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Shorted - AutoCodes.com — P18B6 2016 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Shorted

What does this mean?

What are the Possible Causes of the DTC P18B6 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 P18B6 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 P18B6 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 P18B6 2016 Chevrolet Silverado code?

Need more information on how to fix the P18B6 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 P18B6 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18B6 in a 2016 Chevrolet Silverado?

The common symptoms of OBDII code P18B6, Internal Mode Switch 'B' Circuit Shorted, in a 2016 Chevrolet Silverado may include issues with shifting gears, erratic transmission behavior, and potential illumination of the Check Engine light.

2. What causes the OBDII code P18B6 to trigger in a 2016 Chevrolet Silverado?

The OBDII code P18B6, Internal Mode Switch 'B' Circuit Shorted, in a 2016 Chevrolet Silverado is typically triggered by a short circuit in the internal mode switch 'B' circuit, which is responsible for communicating the gear position to the vehicle's transmission control module.

3. How serious is the OBDII code P18B6 issue in a 2016 Chevrolet Silverado?

The severity of the OBDII code P18B6 issue in a 2016 Chevrolet Silverado can vary. While it may cause transmission-related problems and impact the vehicle's drivability, addressing the underlying cause promptly is crucial to prevent further damage to the transmission system.

4. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P18B6 present?

It is not recommended to continue driving a 2016 Chevrolet Silverado with the OBDII code P18B6 present, as it can lead to transmission issues and potentially cause further damage. It is advisable to address the problem promptly to avoid costly repairs.

5. How can I diagnose and repair the OBDII code P18B6 in my 2016 Chevrolet Silverado?

Diagnosing and repairing the OBDII code P18B6, Internal Mode Switch 'B' Circuit Shorted, in a 2016 Chevrolet Silverado typically involves inspecting the internal mode switch 'B' circuit for shorts, checking the wiring for damage, and replacing the internal mode switch if necessary.

6. Are there any DIY tips for addressing the OBDII code P18B6 in a 2016 Chevrolet Silverado?

While diagnosing and repairing the OBDII code P18B6 may require specialized tools and expertise, you can start by checking the wiring harness for any visible damage or loose connections. However, for a comprehensive repair, it is advisable to consult a professional technician.

7. How much does it cost to fix the OBDII code P18B6 issue in a 2016 Chevrolet Silverado?

The cost of fixing the OBDII code P18B6 issue in a 2016 Chevrolet Silverado can vary depending on the extent of the damage, parts needed for replacement, and labor costs. It is recommended to obtain a diagnosis from a qualified mechanic to get an accurate estimate.

8. Can resetting the OBDII codes clear the P18B6 error in a 2016 Chevrolet Silverado?

Resetting the OBDII codes may temporarily clear the P18B6 error in a 2016 Chevrolet Silverado, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause of the problem to prevent future occurrences.

9. Is the OBDII code P18B6 a common issue in 2016 Chevrolet Silverado vehicles?

While the OBDII code P18B6, Internal Mode Switch 'B' Circuit Shorted, may not be extremely common in 2016 Chevrolet Silverado vehicles, it is a known transmission-related problem that can occur due to various factors like wiring issues or component failures.

10. Can a faulty internal mode switch cause the OBDII code P18B6 in a 2016 Chevrolet Silverado?

Yes, a faulty internal mode switch can cause the OBDII code P18B6, Internal Mode Switch 'B' Circuit Shorted, in a 2016 Chevrolet Silverado. If the internal mode switch is shorted or malfunctioning, it can disrupt the communication between the gear position sensor and the transmission control module, triggering the error code.