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P18B6 2017 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Shorted

Quick Answer

The P18B6 diagnostic trouble code (DTC) indicates a fault in the Internal Mode Switch 'B' circuit of the 2017 Chevrolet Silverado. Common causes include Short circuit in the wiring harness connected to the Internal Mode Switch 'B', Physical damage to the mode switch or its connectors, Corrosion or poor connections within the electrical circuit. 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 2017 Chevrolet Silverado indicates Internal Mode Switch 'B' Circuit Shorted.
Common causes
Common causes include Short circuit in the wiring harness connected to the Internal Mode Switch 'B', Physical damage to the mode switch or its connectors, Corrosion or poor connections within the electrical circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 21, 2024
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Code P18B6 2017 Chevrolet Silverado Description

The P18B6 diagnostic trouble code (DTC) indicates a fault in the Internal Mode Switch 'B' circuit of the 2017 Chevrolet Silverado. This switch is integral to the vehicle's transmission control module (TCM) and is responsible for relaying information about the transmission's operational mode. When this code is triggered, it suggests that there is a short circuit within the wiring or components associated with Mode Switch 'B', which can lead to incorrect signals being sent to the TCM.

OBDII Code P18B6 2017 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Shorted
P18B6 2017 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Shorted

Common Causes of P18B6 2017 Chevrolet Silverado

  1. Short circuit in the wiring harness connected to the Internal Mode Switch 'B'.
  2. Physical damage to the mode switch or its connectors.
  3. Corrosion or poor connections within the electrical circuit.
  4. Faulty Internal Mode Switch 'B' itself.
  5. Issues with the Transmission Control Module (TCM) that may misinterpret signals.

Symptoms of P18B6 2017 Chevrolet Silverado

  1. Erratic or harsh shifting of the transmission.
  2. Transmission slipping or failure to engage certain gears.
  3. Warning lights illuminated on the dashboard, such as the check engine light.
  4. Reduced fuel efficiency due to improper gear engagement.
  5. Unusual noises from the transmission during operation.

How to Fix P18B6 2017 Chevrolet Silverado

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the P18B6 code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the wiring harness and connectors associated with the Internal Mode Switch 'B' for signs of damage, corrosion, or loose connections.
  3. Testing the Mode Switch: Use a multimeter to test the resistance and functionality of the Internal Mode Switch 'B' to determine if it is operating within specifications.
  4. Repair or Replace Components: If a short circuit or damaged wiring is found, repair or replace the affected wiring. If the mode switch is faulty, replace it with a new component.
  5. Clear Codes and Test Drive: After repairs, clear the diagnostic codes and perform a test drive to ensure that the transmission operates smoothly and that the P18B6 code does not reappear.

Cost to Fix P18B6 2017 Chevrolet Silverado

The cost to repair the P18B6 code can vary widely based on the specific issue identified during diagnostics. On average, repairs can range from $150 to $600, depending on whether it involves simple wiring repairs or replacement of the mode switch. Labor costs typically range from $80 to $150 per hour, with the total time for diagnosis and repair potentially taking 1 to 3 hours. It is important to note that labor rates can vary significantly based on location, vehicle make and model, and engine type. Metropolitan areas or dealerships may charge higher rates, while independent shops may offer more competitive pricing. For a more precise estimate, it is advisable to check local repair shop rates and obtain quotes based on the specific diagnosis.

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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 2017 Chevrolet Silverado Code

1. What are common symptoms of the OBDII code P18B6 Internal Mode Switch 'B' Circuit Shorted in a 2017 Chevrolet Silverado?

The common symptoms include issues with shifting gears, erratic shifting patterns, and the transmission being stuck in one gear.

2. What causes the OBDII code P18B6 Internal Mode Switch 'B' Circuit Shorted in a 2017 Chevrolet Silverado?

The code is typically triggered by a short circuit in the internal mode switch 'B' circuit, which is part of the transmission control system.

3. How can I diagnose the OBDII code P18B6 in my 2017 Chevrolet Silverado?

Diagnosing the issue involves using an OBDII scanner to retrieve the trouble code, inspecting the internal mode switch circuit for shorts, and checking the wiring and connectors for any faults.

4. Can I still drive my 2017 Chevrolet Silverado with the P18B6 code present?

It is not recommended to drive the vehicle with the P18B6 code active, as it can lead to further damage to the transmission and affect the vehicle's performance.

5. How can I repair the Internal Mode Switch 'B' Circuit Shorted issue in my 2017 Chevrolet Silverado?

Repairing the issue involves locating and repairing the short circuit in the internal mode switch 'B' circuit, replacing any damaged wiring or connectors, and clearing the trouble code.

6. Is the OBDII code P18B6 Internal Mode Switch 'B' Circuit Shorted a common issue in the 2017 Chevrolet Silverado?

While not extremely common, this code can occur in the 2017 Chevrolet Silverado due to wiring issues, component failures, or electrical faults.

7. Can a DIY enthusiast fix the OBDII code P18B6 in a 2017 Chevrolet Silverado?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the Internal Mode Switch 'B' Circuit Shorted issue, but it is recommended to consult a professional for complex repairs.

8. Will resetting the OBDII code P18B6 in my 2017 Chevrolet Silverado make it go away permanently?

Simply resetting the code will not fix the underlying issue causing the Internal Mode Switch 'B' Circuit Shorted problem. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.

9. How much does it typically cost to repair the OBDII code P18B6 in a 2017 Chevrolet Silverado?

Repair costs can vary depending on the extent of the damage, parts needed for replacement, and labor rates. It is advisable to get a few quotes from reputable repair shops for an accurate estimate.

10. Can a faulty internal mode switch cause other transmission-related issues in a 2017 Chevrolet Silverado?

Yes, a faulty internal mode switch can cause other transmission-related issues such as harsh shifting, delayed engagement, or even transmission failure if not addressed promptly.

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