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P18B7 2014 GMC Sierra Code - Internal Mode Switch 'C' Circuit Shorted

Quick Answer

The diagnostic trouble code P18B7 for a 2014 GMC Sierra indicates that there is a short circuit in the internal mode switch 'C' circuit. Common causes include Damaged wiring or connectors, Faulty internal mode switch, Malfunctioning 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
P18B7 2014 GMC Sierra indicates Internal Mode Switch 'C' Circuit Shorted.
Common causes
Common causes include Damaged wiring or connectors, Faulty internal mode switch, Malfunctioning 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P18B7 2014 GMC Sierra Description

The diagnostic trouble code P18B7 for a 2014 GMC Sierra indicates that there is a short circuit in the internal mode switch 'C' circuit. The internal mode switch is a component in the transmission control module that helps to determine the gear selection and shift points of the transmission. When this circuit is shorted, it can lead to issues with the transmission's performance and overall drivability of the vehicle.

OBDII Code P18B7 2014 GMC Sierra - Internal Mode Switch 'C' Circuit Shorted
P18B7 2014 GMC Sierra Code - Internal Mode Switch 'C' Circuit Shorted

Common Causes of P18B7 2014 GMC Sierra

  1. Damaged wiring or connectors
  2. Faulty internal mode switch
  3. Malfunctioning transmission control module
  4. Water intrusion into the transmission system

Symptoms of P18B7 2014 GMC Sierra

  1. Check engine light illuminated
  2. Erratic shifting
  3. Harsh shifting
  4. Transmission slipping
  5. Transmission failure

How to Fix P18B7 2014 GMC Sierra

  1. Perform a thorough inspection of the internal mode switch 'C' circuit and wiring for any visible damage.
  2. Test the internal mode switch for proper functionality and replace if necessary.
  3. Check the transmission control module for any faults and reprogram or replace as needed.
  4. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P18B7 2014 GMC Sierra

The cost of repairing a short circuit in the internal mode switch 'C' circuit can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to obtain quotes from multiple sources to get a more accurate estimate.

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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 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P18B7 in a 2014 GMC Sierra?

The common symptoms of OBDII code P18B7 in a 2014 GMC Sierra include issues with shifting gears, the inability to shift out of park, and the malfunction indicator light (MIL) illuminating on the dashboard.

2. What does the OBDII code P18B7 'Internal Mode Switch C Circuit Shorted' mean for a 2014 GMC Sierra?

The OBDII code P18B7 indicates that there is a short circuit in the 'C' circuit of the Internal Mode Switch in a 2014 GMC Sierra. This switch is responsible for providing input to the transmission control module regarding the gear shift position.

3. What are the possible causes of OBDII code P18B7 in a 2014 GMC Sierra?

Possible causes of OBDII code P18B7 in a 2014 GMC Sierra include a faulty internal mode switch, damaged wiring or connectors in the circuit, or a malfunctioning transmission control module.

4. How can I diagnose OBDII code P18B7 in my 2014 GMC Sierra?

Diagnosing OBDII code P18B7 in a 2014 GMC Sierra involves using a scan tool to retrieve the specific fault code, checking the internal mode switch for proper operation, inspecting the wiring and connectors for any damage, and testing the transmission control module.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P18B7?

It is not recommended to continue driving your 2014 GMC Sierra with OBDII code P18B7, as it can lead to potential transmission issues and further damage. It is advisable to address the underlying problem promptly.

6. How can I repair OBDII code P18B7 in my 2014 GMC Sierra?

Repairing OBDII code P18B7 in a 2014 GMC Sierra may involve replacing the internal mode switch, repairing or replacing damaged wiring or connectors, or reprogramming the transmission control module. It is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Is OBDII code P18B7 a serious issue in a 2014 GMC Sierra?

OBDII code P18B7 should be taken seriously in a 2014 GMC Sierra as it can cause transmission-related problems and affect the vehicle's drivability. Addressing this issue promptly can help prevent further damage and ensure safe operation of the vehicle.

8. How much does it cost to fix OBDII code P18B7 in a 2014 GMC Sierra?

The cost to fix OBDII code P18B7 in a 2014 GMC Sierra can vary depending on the exact cause of the issue, parts needed for repair, and labor costs. It is advisable to obtain quotes from different repair shops to determine the total repair cost.

9. Can I reset OBDII code P18B7 in my 2014 GMC Sierra without repairing the issue?

While you can clear the fault code and reset the MIL in your 2014 GMC Sierra, it is not recommended to do so without addressing the underlying problem. Resetting the code without fixing the issue may lead to recurring problems and potential safety risks.

10. How can I prevent OBDII code P18B7 from occurring in my 2014 GMC Sierra in the future?

To prevent OBDII code P18B7 from occurring in your 2014 GMC Sierra in the future, it is essential to perform regular vehicle maintenance, address any transmission-related issues promptly, and avoid rough handling of the gear shifter. Routine inspections and servicing can help maintain the internal mode switch and related components in good condition.

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