Engine-CodesChevrolet – P18B6 2016 Chevrolet Silverado

P18B6 2016 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Shorted

Quick Answer

The P18B6 code for a 2016 Chevrolet Silverado indicates an issue with the Internal Mode Switch 'B' Circuit being shorted. Common causes include Corrosion or damage to the wiring associated with the IMS 'B' circuit, Faulty Internal Mode Switch, Electrical issues within the transmission control module. 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 Corrosion or damage to the wiring associated with the IMS 'B' circuit, Faulty Internal Mode Switch, Electrical issues within the transmission control module.
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.
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P18B6 2016 Chevrolet Silverado Description

The P18B6 code for a 2016 Chevrolet Silverado indicates an issue with the Internal Mode Switch 'B' Circuit being shorted. The Internal Mode Switch (IMS) is a component in the transmission that helps the vehicle's computer determine the current gear selection. When the circuit associated with IMS 'B' is shorted, it means that there is an electrical problem that is preventing the proper communication between the transmission and the vehicle's computer.

OBDII Code P18B6 2016 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Shorted
P18B6 2016 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Shorted

Common Causes of P18B6 2016 Chevrolet Silverado

  1. Corrosion or damage to the wiring associated with the IMS 'B' circuit
  2. Faulty Internal Mode Switch
  3. Electrical issues within the transmission control module
  4. Poor connections or loose wiring
  5. Water or fluid damage affecting the circuit

Symptoms of P18B6 2016 Chevrolet Silverado

  1. Erratic shifting behavior
  2. Harsh or delayed shifts
  3. Transmission getting stuck in a particular gear
  4. Limp mode activation

How to Fix P18B6 2016 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the wiring associated with the IMS 'B' circuit to check for any signs of damage or corrosion.
  2. Test the Internal Mode Switch to determine if it is functioning correctly. If faulty, replace the IMS.
  3. Check the transmission control module for any electrical issues or faults. Repair or replace as necessary.
  4. Inspect all connections and wiring related to the IMS 'B' circuit, ensuring they are secure and free of damage.
  5. Clear the fault codes from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P18B6 2016 Chevrolet Silverado

The cost estimate for repairing the Internal Mode Switch 'B' Circuit shorted code can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. It's important to note that the actual cost may be higher or lower based on factors such as labor rates at the repair shop, the location of the shop, and the make and model of the vehicle. It's recommended to obtain quotes from multiple repair shops to get a more accurate estimate for the repair.

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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.

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