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P18B7 2018 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Shorted

Quick Answer

The P18B7 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to an Internal Mode Switch 'C' Circuit Shorted. Common causes include Electrical short in the internal mode switch 'C' circuit, Corrosion or damage to wiring connected to the internal mode switch, Faulty internal mode switch. 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
P18B7 2018 Chevrolet Silverado indicates Internal Mode Switch 'C' Circuit Shorted.
Common causes
Common causes include Electrical short in the internal mode switch 'C' circuit, Corrosion or damage to wiring connected to the internal mode switch, Faulty internal mode switch.
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 Sep 11, 2024
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Code P18B7 2018 Chevrolet Silverado Description

The P18B7 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to an Internal Mode Switch 'C' Circuit Shorted. This code indicates that there is a malfunction in the circuit associated with the internal mode switch 'C', which is a component of the transmission control system in the vehicle. The internal mode switch is responsible for providing feedback to the transmission control module (TCM) regarding the position of the gear selector. When this circuit is shorted, it can lead to improper communication between the internal mode switch and the TCM, resulting in various issues with the vehicle's transmission performance.

OBDII Code P18B7 2018 Chevrolet Silverado - Internal Mode Switch 'C' Circuit Shorted
P18B7 2018 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Shorted

Common Causes of P18B7 2018 Chevrolet Silverado

  1. Electrical short in the internal mode switch 'C' circuit
  2. Corrosion or damage to wiring connected to the internal mode switch
  3. Faulty internal mode switch
  4. Issues with the transmission control module (TCM)
  5. Water or moisture intrusion in the transmission system

Symptoms of P18B7 2018 Chevrolet Silverado

  1. Harsh shifting between gears
  2. Inability to shift gears
  3. Transmission slipping
  4. Limp mode activation
  5. Check engine light illuminated on the dashboard

How to Fix P18B7 2018 Chevrolet Silverado

  1. Begin by diagnosing the internal mode switch 'C' circuit using a professional diagnostic scan tool to pinpoint the exact location of the short.
  2. Inspect the wiring harness connected to the internal mode switch for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  3. Test the internal mode switch itself to determine if it is functioning properly. Replace the internal mode switch if it is found to be defective.
  4. Clear the DTC from the vehicle's computer system using the diagnostic scan tool and test drive the vehicle to ensure that the transmission is shifting correctly.
  5. If the issue persists, further inspection of the TCM may be necessary to determine if there are any additional faults contributing to the circuit short.

Cost to Fix P18B7 2018 Chevrolet Silverado

The typical repair costs for addressing a P18B7 Internal Mode Switch 'C' Circuit Shorted code in a 2018 Chevrolet Silverado can range from $200 to $500, including parts and labor. However, it is essential to note that the specific diagnosis time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. Auto repair shops typically charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships and lower at independent shops. To obtain a more precise estimate, it is advisable to inquire about local rates and obtain multiple quotes before proceeding with 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 P18B7 2018 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P18B7 in a 2018 Chevrolet Silverado?

- Common symptoms include issues with shifting gears, the transmission not engaging properly, and the vehicle going into limp mode.

2. What does the OBDII code P18B7 'Internal Mode Switch C Circuit Shorted' mean for a 2018 Chevrolet Silverado?

- This code indicates a short circuit in the internal mode switch 'C' circuit of the transmission range sensor.

3. What are possible causes of OBDII code P18B7 in a 2018 Chevrolet Silverado?

- Causes may include a faulty internal mode switch, damaged wiring or connectors in the circuit, or issues with the transmission control module.

4. How can I diagnose the OBDII code P18B7 in my 2018 Chevrolet Silverado?

- Diagnosis typically involves using a scan tool to read the code, inspecting the internal mode switch and related components, and testing the circuit for shorts.

5. Can I still drive my 2018 Chevrolet Silverado with OBDII code P18B7?

- It is not recommended to drive the vehicle with this code as it can lead to transmission issues and potential safety hazards.

6. What are the repair options for OBDII code P18B7 in a 2018 Chevrolet Silverado?

- Repair options may include replacing the internal mode switch, repairing damaged wiring or connectors, or reprogramming the transmission control module.

7. Is it safe to reset the OBDII code P18B7 in my 2018 Chevrolet Silverado using a scan tool?

- While you can reset the code using a scan tool, it is crucial to address the underlying issue causing the code to prevent further damage to the transmission system.

8. Can a DIY enthusiast fix OBDII code P18B7 in a 2018 Chevrolet Silverado?

- Depending on the level of expertise, DIY enthusiasts may be able to diagnose and repair this code, but it is recommended to seek professional help for accurate diagnosis and proper repair.

9. How much does it cost to repair OBDII code P18B7 in a 2018 Chevrolet Silverado at a dealership?

- Repair costs can vary depending on the underlying issue, but it may involve parts replacement and labor charges, which can range from a few hundred to over a thousand dollars.

10. Are there any recalls or technical service bulletins related to OBDII code P18B7 in a 2018 Chevrolet Silverado?

- It's advisable to check with the dealership or manufacturer for any recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or remedies available.

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